API: new contract

Co-authored-by: Ludovic Fernandez <ldez@users.noreply.github.com>

cmd/traefik/traefik.go

@@ -204,16 +204,11 @@ func configureLogging(staticConfiguration *static.Configuration) {
 	// an explicitly defined log level always has precedence. if none is
 	// given and debug mode is disabled, the default is ERROR, and DEBUG
 	// otherwise.
-	var levelStr string
+	levelStr := "error"
-	if staticConfiguration.Log != nil {
+	if staticConfiguration.Log != nil && staticConfiguration.Log.Level != "" {
 		levelStr = strings.ToLower(staticConfiguration.Log.Level)
 	}
-	if levelStr == "" {
+
-		levelStr = "error"
-		if staticConfiguration.Global.Debug {
-			levelStr = "debug"
-		}
-	}
 	level, err := logrus.ParseLevel(levelStr)
 	if err != nil {
 		log.WithoutContext().Errorf("Error getting level: %v", err)

docs/content/operations/api.md

@@ -0,0 +1,168 @@
+# API
+
+Traefik exposes a number of information through an API handler, such as the configuration of all routers, services, middlewares, etc.
+
+As with all features of Traefik, this handler can be enabled with the [static configuration](../getting-started/configuration-overview.md#the-static-configuration).
+
+## Security
+
+Enabling the API in production is not recommended, because it will expose all configuration elements,
+including sensitive data.
+
+In production, it should be at least secured by authentication and authorizations.
+
+A good sane default (non exhaustive) set of recommendations
+would be to apply the following protection mechanisms:
+
+* At the application level:  
+  securing with middlewares such as [basic authentication](../middlewares/basicauth.md) or [white listing](../middlewares/ipwhitelist.md).
+
+* At the transport level:  
+  NOT publicly exposing the API's port,
+  keeping it restricted to internal networks
+  (as in the [principle of least privilege](https://en.wikipedia.org/wiki/Principle_of_least_privilege), applied to networks).
+
+## Configuration
+
+To enable the API handler:
+
+```toml tab="File"
+[api]
+```
+
+```bash tab="CLI"
+--api
+```
+
+### `dashboard`
+
+_Optional, Default=true_
+
+Enable the dashboard. More about the dashboard features [here](./dashboard.md).
+
+```toml tab="File"
+[api]
+  dashboard = true
+```
+
+```bash tab="CLI"
+--api.dashboard
+```
+
+### `entrypoint`
+
+_Optional, Default="traefik"_
+
+The entry point that the API handler will be bound to.
+The default ("traefik") is an internal entry point (which is always defined).
+
+```toml tab="File"
+[api]
+  entrypoint = "web"
+```
+
+```bash tab="CLI"
+--api.entrypoint="web"
+```
+
+### `middlewares`
+
+_Optional, Default=empty_
+
+The list of [middlewares](../middlewares/overview.md) applied to the API handler.
+
+```toml tab="File"
+[api]
+  middlewares = ["api-auth", "api-prefix"]
+```
+
+```bash tab="CLI"
+--api.middlewares="api-auth,api-prefix"
+```
+
+### `debug`
+
+_Optional, Default=false_
+
+Enable additional endpoints for debugging and profiling, served under `/debug/`.
+
+```toml tab="File"
+[api]
+  debug = true
+```
+
+```bash tab="CLI"
+--api.debug=true
+```
+
+## Endpoints
+
+All the following endpoints must be accessed with a `GET` HTTP request.
+
+| Path                           | Description                                                                               |
+|--------------------------------|-------------------------------------------------------------------------------------------|
+| `/api/http/routers`            | Lists all the HTTP routers information.                                                   |
+| `/api/http/routers/{name}`     | Returns the information of the HTTP router specified by `name`.                           |
+| `/api/http/services`           | Lists all the HTTP services information.                                                  |
+| `/api/http/services/{name}`    | Returns the information of the HTTP service specified by `name`.                          |
+| `/api/http/middlewares`        | Lists all the HTTP middlewares information.                                               |
+| `/api/http/middlewares/{name}` | Returns the information of the HTTP middleware specified by `name`.                       |
+| `/api/tcp/routers`             | Lists all the TCP routers information.                                                    |
+| `/api/tcp/routers/{name}`      | Returns the information of the TCP router specified by `name`.                            |
+| `/api/tcp/services`            | Lists all the TCP services information.                                                   |
+| `/api/tcp/services/{name}`     | Returns the information of the TCP service specified by `name`.                           |
+| `/api/version`                 | Returns information about Traefik version.                                                |
+| `/debug/vars`                  | See the [expvar](https://golang.org/pkg/expvar/) Go documentation.                        |
+| `/debug/pprof/`                | See the [pprof Index](https://golang.org/pkg/net/http/pprof/#Index) Go documentation.     |
+| `/debug/pprof/cmdline`         | See the [pprof Cmdline](https://golang.org/pkg/net/http/pprof/#Cmdline) Go documentation. |
+| `/debug/pprof/profile`         | See the [pprof Profile](https://golang.org/pkg/net/http/pprof/#Profile) Go documentation. |
+| `/debug/pprof/symbol`          | See the [pprof Symbol](https://golang.org/pkg/net/http/pprof/#Symbol) Go documentation.   |
+| `/debug/pprof/trace`           | See the [pprof Trace](https://golang.org/pkg/net/http/pprof/#Trace) Go documentation.     |
+
+## Common Configuration Use Cases
+
+### Address / Port
+
+You can define a custom address/port like this:
+
+```toml
+[entryPoints]
+  [entryPoints.web]
+  address = ":80"
+
+  [entryPoints.foo]
+  address = ":8082"
+
+  [entryPoints.bar]
+  address = ":8083"
+
+[ping]
+entryPoint = "foo"
+
+[api]
+entryPoint = "bar"
+```
+
+In the above example, you would access a service at /foo, an api endpoint, or the health-check as follows:
+
+* Service: `http://hostname:80/foo`
+* API: `http://hostname:8083/api/http/routers`
+* Ping URL: `http://hostname:8082/ping`
+
+### Authentication
+
+To restrict access to the API handler, one can add authentication with the [basic auth middleware](../middlewares/basicauth.md).
+
+```toml
+[api]
+  middlewares=["api-auth"]
+```
+
+```toml
+[http.middlewares]
+  [http.middlewares.api-auth.basicauth]
+  users = [
+    "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/",
+    "test2:$apr1$d9hr9HBB$4HxwgUir3HP4EsggP/QNo0",
+  ]
+```

docs/content/operations/debug-mode.md

@@ -1,15 +0,0 @@
-# The Debug Mode
-
-Getting More Information (Not For Production)
-{: .subtitle }
-
-The debug mode will make Traefik be _extremely_ verbose in its logs, and is NOT intended for production purposes.
-
-## Configuration Example
-
-??? example "TOML -- Enabling the Debug Mode"
-
-    ```toml
-    [Global]
-       debug = true
-    ```

docs/content/reference/static-configuration/cli.txt

@@ -1,3 +1,4 @@
+
 --accesslog  (Default: "false")
     Access log settings.
 
@@ -95,8 +96,11 @@
 --api.dashboard  (Default: "true")
     Activate dashboard.
 
+--api.debug  (Default: "false")
+    Enable additional endpoints for debugging and profiling.
+
 --api.entrypoint  (Default: "traefik")
-    EntryPoint.
+    The entry point that the API handler will be bound to.
 
 --api.middlewares  (Default: "")
     Middleware list.
@@ -153,9 +157,6 @@
 --global.checknewversion  (Default: "true")
     Periodically check if a new version has been released.
 
---global.debug  (Default: "false")
-    Enable debug mode.
-
 --global.sendanonymoususage
     Periodically send anonymous usage statistics. If the option is not specified, it
     will be enabled by default.

docs/content/reference/static-configuration/env.md

@@ -93,8 +93,11 @@ Enable api/dashboard. (Default: ```false```)
 `TRAEFIK_API_DASHBOARD`:  
 Activate dashboard. (Default: ```true```)
 
+`TRAEFIK_API_DEBUG`:  
+Enable additional endpoints for debugging and profiling. (Default: ```false```)
+
 `TRAEFIK_API_ENTRYPOINT`:  
-EntryPoint. (Default: ```traefik```)
+The entry point that the API handler will be bound to. (Default: ```traefik```)
 
 `TRAEFIK_API_MIDDLEWARES`:  
 Middleware list.
@@ -147,9 +150,6 @@ WriteTimeout is the maximum duration before timing out writes of the response. I
 `TRAEFIK_GLOBAL_CHECKNEWVERSION`:  
 Periodically check if a new version has been released. (Default: ```false```)
 
-`TRAEFIK_GLOBAL_DEBUG`:  
-Enable debug mode. (Default: ```false```)
-
 `TRAEFIK_GLOBAL_SENDANONYMOUSUSAGE`:  
 Periodically send anonymous usage statistics. If the option is not specified, it will be enabled by default.
 

docs/content/reference/static-configuration/file.toml

@@ -1,5 +1,4 @@
 [Global]
-  Debug = true
   CheckNewVersion = true
   SendAnonymousUsage = true
 

docs/mkdocs.yml

@@ -113,8 +113,8 @@ nav:
   - 'Operations':
       - 'CLI': 'operations/cli.md'
       - 'Dashboard' : 'operations/dashboard.md'
+      - 'API': 'operations/api.md'
       - 'Ping': 'operations/ping.md'
-      - 'Debug Mode': 'operations/debug-mode.md'
   - 'Observability':
       - 'Logs': 'observability/logs.md'
       - 'Access Logs': 'observability/access-logs.md'

integration/simple_test.go

@@ -161,7 +161,7 @@ func (s *SimpleSuite) TestApiOnSameEntryPoint(c *check.C) {
 	s.createComposeProject(c, "base")
 	s.composeProject.Start(c)
 
-	cmd, output := s.traefikCmd("--entryPoints.http.Address=:8000", "--api.entryPoint=http", "--global.debug", "--providers.docker")
+	cmd, output := s.traefikCmd("--entryPoints.http.Address=:8000", "--api.entryPoint=http", "--log.level=DEBUG", "--providers.docker")
 	defer output(c)
 
 	err := cmd.Start()
@@ -241,7 +241,7 @@ func (s *SimpleSuite) TestDefaultEntrypointHTTP(c *check.C) {
 	s.createComposeProject(c, "base")
 	s.composeProject.Start(c)
 
-	cmd, output := s.traefikCmd("--entryPoints.http.Address=:8000", "--global.debug", "--providers.docker", "--api")
+	cmd, output := s.traefikCmd("--entryPoints.http.Address=:8000", "--log.level=DEBUG", "--providers.docker", "--api")
 	defer output(c)
 
 	err := cmd.Start()
@@ -259,7 +259,7 @@ func (s *SimpleSuite) TestWithUnexistingEntrypoint(c *check.C) {
 	s.createComposeProject(c, "base")
 	s.composeProject.Start(c)
 
-	cmd, output := s.traefikCmd("--entryPoints.http.Address=:8000", "--global.debug", "--providers.docker", "--api")
+	cmd, output := s.traefikCmd("--entryPoints.http.Address=:8000", "--log.level=DEBUG", "--providers.docker", "--api")
 	defer output(c)
 
 	err := cmd.Start()
@@ -277,7 +277,7 @@ func (s *SimpleSuite) TestMetricsPrometheusDefaultEntrypoint(c *check.C) {
 	s.createComposeProject(c, "base")
 	s.composeProject.Start(c)
 
-	cmd, output := s.traefikCmd("--entryPoints.http.Address=:8000", "--api", "--metrics.prometheus.buckets=0.1,0.3,1.2,5.0", "--providers.docker", "--global.debug")
+	cmd, output := s.traefikCmd("--entryPoints.http.Address=:8000", "--api", "--metrics.prometheus.buckets=0.1,0.3,1.2,5.0", "--providers.docker", "--log.level=DEBUG")
 	defer output(c)
 
 	err := cmd.Start()

integration/websocket_test.go

@@ -49,7 +49,7 @@ func (s *WebsocketSuite) TestBase(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()
@@ -99,7 +99,7 @@ func (s *WebsocketSuite) TestWrongOrigin(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()
@@ -149,7 +149,7 @@ func (s *WebsocketSuite) TestOrigin(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()
@@ -210,7 +210,7 @@ func (s *WebsocketSuite) TestWrongOriginIgnoredByServer(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()
@@ -268,7 +268,7 @@ func (s *WebsocketSuite) TestSSLTermination(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()
@@ -331,7 +331,7 @@ func (s *WebsocketSuite) TestBasicAuth(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()
@@ -375,7 +375,7 @@ func (s *WebsocketSuite) TestSpecificResponseFromBackend(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()
@@ -421,7 +421,7 @@ func (s *WebsocketSuite) TestURLWithURLEncodedChar(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()
@@ -476,7 +476,7 @@ func (s *WebsocketSuite) TestSSLhttp2(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug", "--accesslog")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG", "--accesslog")
 	defer display(c)
 
 	err := cmd.Start()
@@ -535,7 +535,7 @@ func (s *WebsocketSuite) TestHeaderAreForwared(c *check.C) {
 	})
 
 	defer os.Remove(file)
-	cmd, display := s.traefikCmd(withConfigFile(file), "--global.debug")
+	cmd, display := s.traefikCmd(withConfigFile(file), "--log.level=DEBUG")
 	defer display(c)
 
 	err := cmd.Start()

pkg/anonymize/anonymize_config_test.go

@@ -28,7 +28,6 @@ func TestDo_globalConfiguration(t *testing.T) {
 
 	sendAnonymousUsage := true
 	config.Global = &static.Global{
-		Debug:              true,
 		CheckNewVersion:    true,
 		SendAnonymousUsage: &sendAnonymousUsage,
 	}

pkg/api/handler.go

@@ -1,8 +1,12 @@
 package api
 
 import (
-	"io"
+	"encoding/json"
+	"fmt"
 	"net/http"
+	"sort"
+	"strconv"
+	"strings"
 
 	"github.com/containous/mux"
 	"github.com/containous/traefik/pkg/config"
@@ -11,14 +15,14 @@ import (
 	"github.com/containous/traefik/pkg/types"
 	"github.com/containous/traefik/pkg/version"
 	assetfs "github.com/elazarl/go-bindata-assetfs"
-	"github.com/unrolled/render"
 )
 
-var templateRenderer jsonRenderer = render.New(render.Options{Directory: "nowhere"})
+const (
+	defaultPerPage = 100
+	defaultPage    = 1
+)
 
-type jsonRenderer interface {
+const nextPageHeader = "X-Next-Page"
-	JSON(w io.Writer, status int, v interface{}) error
-}
 
 type serviceInfoRepresentation struct {
 	*config.ServiceInfo
@@ -34,6 +38,43 @@ type RunTimeRepresentation struct {
 	TCPServices map[string]*config.TCPServiceInfo     `json:"tcpServices,omitempty"`
 }
 
+type routerRepresentation struct {
+	*config.RouterInfo
+	Name     string `json:"name,omitempty"`
+	Provider string `json:"provider,omitempty"`
+}
+
+type serviceRepresentation struct {
+	*config.ServiceInfo
+	ServerStatus map[string]string `json:"serverStatus,omitempty"`
+	Name         string            `json:"name,omitempty"`
+	Provider     string            `json:"provider,omitempty"`
+}
+
+type middlewareRepresentation struct {
+	*config.MiddlewareInfo
+	Name     string `json:"name,omitempty"`
+	Provider string `json:"provider,omitempty"`
+}
+
+type tcpRouterRepresentation struct {
+	*config.TCPRouterInfo
+	Name     string `json:"name,omitempty"`
+	Provider string `json:"provider,omitempty"`
+}
+
+type tcpServiceRepresentation struct {
+	*config.TCPServiceInfo
+	Name     string `json:"name,omitempty"`
+	Provider string `json:"provider,omitempty"`
+}
+
+type pageInfo struct {
+	startIndex int
+	endIndex   int
+	nextPage   int
+}
+
 // Handler serves the configuration and status of Traefik on API endpoints.
 type Handler struct {
 	dashboard bool
@@ -59,7 +100,7 @@ func New(staticConfig static.Configuration, runtimeConfig *config.RuntimeConfigu
 		statistics:           staticConfig.API.Statistics,
 		dashboardAssets:      staticConfig.API.DashboardAssets,
 		runtimeConfiguration: rConfig,
-		debug:                staticConfig.Global.Debug,
+		debug:                staticConfig.API.Debug,
 	}
 }
 
@@ -71,9 +112,21 @@ func (h Handler) Append(router *mux.Router) {
 
 	router.Methods(http.MethodGet).Path("/api/rawdata").HandlerFunc(h.getRuntimeConfiguration)
 
+	router.Methods(http.MethodGet).Path("/api/http/routers").HandlerFunc(h.getRouters)
+	router.Methods(http.MethodGet).Path("/api/http/routers/{routerID}").HandlerFunc(h.getRouter)
+	router.Methods(http.MethodGet).Path("/api/http/services").HandlerFunc(h.getServices)
+	router.Methods(http.MethodGet).Path("/api/http/services/{serviceID}").HandlerFunc(h.getService)
+	router.Methods(http.MethodGet).Path("/api/http/middlewares").HandlerFunc(h.getMiddlewares)
+	router.Methods(http.MethodGet).Path("/api/http/middlewares/{middlewareID}").HandlerFunc(h.getMiddleware)
+
+	router.Methods(http.MethodGet).Path("/api/tcp/routers").HandlerFunc(h.getTCPRouters)
+	router.Methods(http.MethodGet).Path("/api/tcp/routers/{routerID}").HandlerFunc(h.getTCPRouter)
+	router.Methods(http.MethodGet).Path("/api/tcp/services").HandlerFunc(h.getTCPServices)
+	router.Methods(http.MethodGet).Path("/api/tcp/services/{serviceID}").HandlerFunc(h.getTCPService)
+
 	// FIXME stats
 	// health route
-	//router.Methods(http.MethodGet).Path("/health").HandlerFunc(p.getHealthHandler)
+	// router.Methods(http.MethodGet).Path("/health").HandlerFunc(p.getHealthHandler)
 
 	version.Handler{}.Append(router)
 
@@ -82,6 +135,268 @@ func (h Handler) Append(router *mux.Router) {
 	}
 }
 
+func (h Handler) getRouters(rw http.ResponseWriter, request *http.Request) {
+	results := make([]routerRepresentation, 0, len(h.runtimeConfiguration.Routers))
+
+	for name, rt := range h.runtimeConfiguration.Routers {
+		results = append(results, routerRepresentation{
+			RouterInfo: rt,
+			Name:       name,
+			Provider:   getProviderName(name),
+		})
+	}
+
+	sort.Slice(results, func(i, j int) bool {
+		return results[i].Name < results[j].Name
+	})
+
+	pageInfo, err := pagination(request, len(results))
+	if err != nil {
+		http.Error(rw, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	rw.Header().Set(nextPageHeader, strconv.Itoa(pageInfo.nextPage))
+
+	err = json.NewEncoder(rw).Encode(results[pageInfo.startIndex:pageInfo.endIndex])
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getRouter(rw http.ResponseWriter, request *http.Request) {
+	routerID := mux.Vars(request)["routerID"]
+
+	router, ok := h.runtimeConfiguration.Routers[routerID]
+	if !ok {
+		http.NotFound(rw, request)
+		return
+	}
+
+	result := routerRepresentation{
+		RouterInfo: router,
+		Name:       routerID,
+		Provider:   getProviderName(routerID),
+	}
+
+	err := json.NewEncoder(rw).Encode(result)
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getServices(rw http.ResponseWriter, request *http.Request) {
+	results := make([]serviceRepresentation, 0, len(h.runtimeConfiguration.Services))
+
+	for name, si := range h.runtimeConfiguration.Services {
+		results = append(results, serviceRepresentation{
+			ServiceInfo:  si,
+			Name:         name,
+			Provider:     getProviderName(name),
+			ServerStatus: si.GetAllStatus(),
+		})
+	}
+
+	sort.Slice(results, func(i, j int) bool {
+		return results[i].Name < results[j].Name
+	})
+
+	pageInfo, err := pagination(request, len(results))
+	if err != nil {
+		http.Error(rw, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	rw.Header().Set(nextPageHeader, strconv.Itoa(pageInfo.nextPage))
+
+	err = json.NewEncoder(rw).Encode(results[pageInfo.startIndex:pageInfo.endIndex])
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getService(rw http.ResponseWriter, request *http.Request) {
+	serviceID := mux.Vars(request)["serviceID"]
+
+	service, ok := h.runtimeConfiguration.Services[serviceID]
+	if !ok {
+		http.NotFound(rw, request)
+		return
+	}
+
+	result := serviceRepresentation{
+		ServiceInfo:  service,
+		Name:         serviceID,
+		Provider:     getProviderName(serviceID),
+		ServerStatus: service.GetAllStatus(),
+	}
+
+	err := json.NewEncoder(rw).Encode(result)
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getMiddlewares(rw http.ResponseWriter, request *http.Request) {
+	results := make([]middlewareRepresentation, 0, len(h.runtimeConfiguration.Middlewares))
+
+	for name, mi := range h.runtimeConfiguration.Middlewares {
+		results = append(results, middlewareRepresentation{
+			MiddlewareInfo: mi,
+			Name:           name,
+			Provider:       getProviderName(name),
+		})
+	}
+
+	sort.Slice(results, func(i, j int) bool {
+		return results[i].Name < results[j].Name
+	})
+
+	pageInfo, err := pagination(request, len(results))
+	if err != nil {
+		http.Error(rw, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	rw.Header().Set(nextPageHeader, strconv.Itoa(pageInfo.nextPage))
+
+	err = json.NewEncoder(rw).Encode(results[pageInfo.startIndex:pageInfo.endIndex])
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getMiddleware(rw http.ResponseWriter, request *http.Request) {
+	middlewareID := mux.Vars(request)["middlewareID"]
+
+	middleware, ok := h.runtimeConfiguration.Middlewares[middlewareID]
+	if !ok {
+		http.NotFound(rw, request)
+		return
+	}
+
+	result := middlewareRepresentation{
+		MiddlewareInfo: middleware,
+		Name:           middlewareID,
+		Provider:       getProviderName(middlewareID),
+	}
+
+	err := json.NewEncoder(rw).Encode(result)
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getTCPRouters(rw http.ResponseWriter, request *http.Request) {
+	results := make([]tcpRouterRepresentation, 0, len(h.runtimeConfiguration.TCPRouters))
+
+	for name, rt := range h.runtimeConfiguration.TCPRouters {
+		results = append(results, tcpRouterRepresentation{
+			TCPRouterInfo: rt,
+			Name:          name,
+			Provider:      getProviderName(name),
+		})
+	}
+
+	sort.Slice(results, func(i, j int) bool {
+		return results[i].Name < results[j].Name
+	})
+
+	pageInfo, err := pagination(request, len(results))
+	if err != nil {
+		http.Error(rw, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	rw.Header().Set(nextPageHeader, strconv.Itoa(pageInfo.nextPage))
+
+	err = json.NewEncoder(rw).Encode(results[pageInfo.startIndex:pageInfo.endIndex])
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getTCPRouter(rw http.ResponseWriter, request *http.Request) {
+	routerID := mux.Vars(request)["routerID"]
+
+	router, ok := h.runtimeConfiguration.TCPRouters[routerID]
+	if !ok {
+		http.NotFound(rw, request)
+		return
+	}
+
+	result := tcpRouterRepresentation{
+		TCPRouterInfo: router,
+		Name:          routerID,
+		Provider:      getProviderName(routerID),
+	}
+
+	err := json.NewEncoder(rw).Encode(result)
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getTCPServices(rw http.ResponseWriter, request *http.Request) {
+	results := make([]tcpServiceRepresentation, 0, len(h.runtimeConfiguration.TCPServices))
+
+	for name, si := range h.runtimeConfiguration.TCPServices {
+		results = append(results, tcpServiceRepresentation{
+			TCPServiceInfo: si,
+			Name:           name,
+			Provider:       getProviderName(name),
+		})
+	}
+
+	sort.Slice(results, func(i, j int) bool {
+		return results[i].Name < results[j].Name
+	})
+
+	pageInfo, err := pagination(request, len(results))
+	if err != nil {
+		http.Error(rw, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	rw.Header().Set(nextPageHeader, strconv.Itoa(pageInfo.nextPage))
+
+	err = json.NewEncoder(rw).Encode(results[pageInfo.startIndex:pageInfo.endIndex])
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (h Handler) getTCPService(rw http.ResponseWriter, request *http.Request) {
+	serviceID := mux.Vars(request)["serviceID"]
+
+	service, ok := h.runtimeConfiguration.TCPServices[serviceID]
+	if !ok {
+		http.NotFound(rw, request)
+		return
+	}
+
+	result := tcpServiceRepresentation{
+		TCPServiceInfo: service,
+		Name:           serviceID,
+		Provider:       getProviderName(serviceID),
+	}
+
+	err := json.NewEncoder(rw).Encode(result)
+	if err != nil {
+		log.FromContext(request.Context()).Error(err)
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+	}
+}
+
 func (h Handler) getRuntimeConfiguration(rw http.ResponseWriter, request *http.Request) {
 	siRepr := make(map[string]*serviceInfoRepresentation, len(h.runtimeConfiguration.Services))
 	for k, v := range h.runtimeConfiguration.Services {
@@ -91,7 +406,7 @@ func (h Handler) getRuntimeConfiguration(rw http.ResponseWriter, request *http.R
 		}
 	}
 
-	rtRepr := RunTimeRepresentation{
+	result := RunTimeRepresentation{
 		Routers:     h.runtimeConfiguration.Routers,
 		Middlewares: h.runtimeConfiguration.Middlewares,
 		Services:    siRepr,
@@ -99,9 +414,55 @@ func (h Handler) getRuntimeConfiguration(rw http.ResponseWriter, request *http.R
 		TCPServices: h.runtimeConfiguration.TCPServices,
 	}
 
-	err := templateRenderer.JSON(rw, http.StatusOK, rtRepr)
+	err := json.NewEncoder(rw).Encode(result)
 	if err != nil {
 		log.FromContext(request.Context()).Error(err)
 		http.Error(rw, err.Error(), http.StatusInternalServerError)
 	}
 }
+
+func pagination(request *http.Request, max int) (pageInfo, error) {
+	perPage, err := getIntParam(request, "per_page", defaultPerPage)
+	if err != nil {
+		return pageInfo{}, err
+	}
+
+	page, err := getIntParam(request, "page", defaultPage)
+	if err != nil {
+		return pageInfo{}, err
+	}
+
+	startIndex := (page - 1) * perPage
+	if startIndex != 0 && startIndex >= max {
+		return pageInfo{}, fmt.Errorf("invalid request: page: %d, per_page: %d", page, perPage)
+	}
+
+	endIndex := startIndex + perPage
+	if endIndex >= max {
+		endIndex = max
+	}
+
+	nextPage := 1
+	if page*perPage < max {
+		nextPage = page + 1
+	}
+
+	return pageInfo{startIndex: startIndex, endIndex: endIndex, nextPage: nextPage}, nil
+}
+
+func getIntParam(request *http.Request, key string, defaultValue int) (int, error) {
+	raw := request.URL.Query().Get(key)
+	if raw == "" {
+		return defaultValue, nil
+	}
+
+	value, err := strconv.Atoi(raw)
+	if err != nil || value <= 0 {
+		return 0, fmt.Errorf("invalid request: %s: %d", key, value)
+	}
+	return value, nil
+}
+
+func getProviderName(id string) string {
+	return strings.SplitN(id, ".", 2)[0]
+}

pkg/api/handler_test.go

@@ -3,9 +3,11 @@ package api
 import (
 	"encoding/json"
 	"flag"
+	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
+	"strconv"
 	"testing"
 
 	"github.com/containous/mux"
@@ -17,6 +19,882 @@ import (
 
 var updateExpected = flag.Bool("update_expected", false, "Update expected files in testdata")
 
+func TestHandlerTCP_API(t *testing.T) {
+	type expected struct {
+		statusCode int
+		nextPage   string
+		jsonFile   string
+	}
+
+	testCases := []struct {
+		desc     string
+		path     string
+		conf     config.RuntimeConfiguration
+		expected expected
+	}{
+		{
+			desc: "all TCP routers, but no config",
+			path: "/api/tcp/routers",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/tcprouters-empty.json",
+			},
+		},
+		{
+			desc: "all TCP routers",
+			path: "/api/tcp/routers",
+			conf: config.RuntimeConfiguration{
+				TCPRouters: map[string]*config.TCPRouterInfo{
+					"myprovider.test": {
+						TCPRouter: &config.TCPRouter{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar.other`)",
+							TLS: &config.RouterTCPTLSConfig{
+								Passthrough: false,
+							},
+						},
+					},
+					"myprovider.bar": {
+						TCPRouter: &config.TCPRouter{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar`)",
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/tcprouters.json",
+			},
+		},
+		{
+			desc: "all TCP routers, pagination, 1 res per page, want page 2",
+			path: "/api/tcp/routers?page=2&per_page=1",
+			conf: config.RuntimeConfiguration{
+				TCPRouters: map[string]*config.TCPRouterInfo{
+					"myprovider.bar": {
+						TCPRouter: &config.TCPRouter{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar`)",
+						},
+					},
+					"myprovider.baz": {
+						TCPRouter: &config.TCPRouter{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`toto.bar`)",
+						},
+					},
+					"myprovider.test": {
+						TCPRouter: &config.TCPRouter{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar.other`)",
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "3",
+				jsonFile:   "testdata/tcprouters-page2.json",
+			},
+		},
+		{
+			desc: "one TCP router by id",
+			path: "/api/tcp/routers/myprovider.bar",
+			conf: config.RuntimeConfiguration{
+				TCPRouters: map[string]*config.TCPRouterInfo{
+					"myprovider.bar": {
+						TCPRouter: &config.TCPRouter{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar`)",
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				jsonFile:   "testdata/tcprouter-bar.json",
+			},
+		},
+		{
+			desc: "one TCP router by id, that does not exist",
+			path: "/api/tcp/routers/myprovider.foo",
+			conf: config.RuntimeConfiguration{
+				TCPRouters: map[string]*config.TCPRouterInfo{
+					"myprovider.bar": {
+						TCPRouter: &config.TCPRouter{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar`)",
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+		{
+			desc: "one TCP router by id, but no config",
+			path: "/api/tcp/routers/myprovider.bar",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+		{
+			desc: "all tcp services, but no config",
+			path: "/api/tcp/services",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/tcpservices-empty.json",
+			},
+		},
+		{
+			desc: "all tcp services",
+			path: "/api/tcp/services",
+			conf: config.RuntimeConfiguration{
+				TCPServices: map[string]*config.TCPServiceInfo{
+					"myprovider.bar": {
+						TCPService: &config.TCPService{
+							LoadBalancer: &config.TCPLoadBalancerService{
+								Servers: []config.TCPServer{
+									{
+										Address: "127.0.0.1:2345",
+									},
+								},
+							},
+						},
+						UsedBy: []string{"myprovider.foo", "myprovider.test"},
+					},
+					"myprovider.baz": {
+						TCPService: &config.TCPService{
+							LoadBalancer: &config.TCPLoadBalancerService{
+								Servers: []config.TCPServer{
+									{
+										Address: "127.0.0.2:2345",
+									},
+								},
+							},
+						},
+						UsedBy: []string{"myprovider.foo"},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/tcpservices.json",
+			},
+		},
+		{
+			desc: "all tcp services, 1 res per page, want page 2",
+			path: "/api/tcp/services?page=2&per_page=1",
+			conf: config.RuntimeConfiguration{
+				TCPServices: map[string]*config.TCPServiceInfo{
+					"myprovider.bar": {
+						TCPService: &config.TCPService{
+							LoadBalancer: &config.TCPLoadBalancerService{
+								Servers: []config.TCPServer{
+									{
+										Address: "127.0.0.1:2345",
+									},
+								},
+							},
+						},
+						UsedBy: []string{"myprovider.foo", "myprovider.test"},
+					},
+					"myprovider.baz": {
+						TCPService: &config.TCPService{
+							LoadBalancer: &config.TCPLoadBalancerService{
+								Servers: []config.TCPServer{
+									{
+										Address: "127.0.0.2:2345",
+									},
+								},
+							},
+						},
+						UsedBy: []string{"myprovider.foo"},
+					},
+					"myprovider.test": {
+						TCPService: &config.TCPService{
+							LoadBalancer: &config.TCPLoadBalancerService{
+								Servers: []config.TCPServer{
+									{
+										Address: "127.0.0.3:2345",
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "3",
+				jsonFile:   "testdata/tcpservices-page2.json",
+			},
+		},
+		{
+			desc: "one tcp service by id",
+			path: "/api/tcp/services/myprovider.bar",
+			conf: config.RuntimeConfiguration{
+				TCPServices: map[string]*config.TCPServiceInfo{
+					"myprovider.bar": {
+						TCPService: &config.TCPService{
+							LoadBalancer: &config.TCPLoadBalancerService{
+								Servers: []config.TCPServer{
+									{
+										Address: "127.0.0.1:2345",
+									},
+								},
+							},
+						},
+						UsedBy: []string{"myprovider.foo", "myprovider.test"},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				jsonFile:   "testdata/tcpservice-bar.json",
+			},
+		},
+		{
+			desc: "one tcp service by id, that does not exist",
+			path: "/api/tcp/services/myprovider.nono",
+			conf: config.RuntimeConfiguration{
+				TCPServices: map[string]*config.TCPServiceInfo{
+					"myprovider.bar": {
+						TCPService: &config.TCPService{
+							LoadBalancer: &config.TCPLoadBalancerService{
+								Servers: []config.TCPServer{
+									{
+										Address: "127.0.0.1:2345",
+									},
+								},
+							},
+						},
+						UsedBy: []string{"myprovider.foo", "myprovider.test"},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+		{
+			desc: "one tcp service by id, but no config",
+			path: "/api/tcp/services/myprovider.foo",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			rtConf := &test.conf
+			handler := New(static.Configuration{API: &static.API{}, Global: &static.Global{}}, rtConf)
+			router := mux.NewRouter()
+			handler.Append(router)
+
+			server := httptest.NewServer(router)
+
+			resp, err := http.DefaultClient.Get(server.URL + test.path)
+			require.NoError(t, err)
+
+			assert.Equal(t, test.expected.nextPage, resp.Header.Get(nextPageHeader))
+
+			require.Equal(t, test.expected.statusCode, resp.StatusCode)
+
+			if test.expected.jsonFile == "" {
+				return
+			}
+
+			contents, err := ioutil.ReadAll(resp.Body)
+			require.NoError(t, err)
+
+			err = resp.Body.Close()
+			require.NoError(t, err)
+
+			if *updateExpected {
+				var results interface{}
+				err := json.Unmarshal(contents, &results)
+				require.NoError(t, err)
+
+				newJSON, err := json.MarshalIndent(results, "", "\t")
+				require.NoError(t, err)
+
+				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0644)
+				require.NoError(t, err)
+			}
+
+			data, err := ioutil.ReadFile(test.expected.jsonFile)
+			require.NoError(t, err)
+			assert.JSONEq(t, string(data), string(contents))
+		})
+	}
+}
+
+func TestHandlerHTTP_API(t *testing.T) {
+	type expected struct {
+		statusCode int
+		nextPage   string
+		jsonFile   string
+	}
+
+	testCases := []struct {
+		desc     string
+		path     string
+		conf     config.RuntimeConfiguration
+		expected expected
+	}{
+		{
+			desc: "all routers, but no config",
+			path: "/api/http/routers",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/routers-empty.json",
+			},
+		},
+		{
+			desc: "all routers",
+			path: "/api/http/routers",
+			conf: config.RuntimeConfiguration{
+				Routers: map[string]*config.RouterInfo{
+					"myprovider.test": {
+						Router: &config.Router{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar.other`)",
+							Middlewares: []string{"addPrefixTest", "auth"},
+						},
+					},
+					"myprovider.bar": {
+						Router: &config.Router{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar`)",
+							Middlewares: []string{"auth", "anotherprovider.addPrefixTest"},
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/routers.json",
+			},
+		},
+		{
+			desc: "all routers, pagination, 1 res per page, want page 2",
+			path: "/api/http/routers?page=2&per_page=1",
+			conf: config.RuntimeConfiguration{
+				Routers: map[string]*config.RouterInfo{
+					"myprovider.bar": {
+						Router: &config.Router{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar`)",
+							Middlewares: []string{"auth", "anotherprovider.addPrefixTest"},
+						},
+					},
+					"myprovider.baz": {
+						Router: &config.Router{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`toto.bar`)",
+						},
+					},
+					"myprovider.test": {
+						Router: &config.Router{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar.other`)",
+							Middlewares: []string{"addPrefixTest", "auth"},
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "3",
+				jsonFile:   "testdata/routers-page2.json",
+			},
+		},
+		{
+			desc: "all routers, pagination, 19 results overall, 7 res per page, want page 3",
+			path: "/api/http/routers?page=3&per_page=7",
+			conf: config.RuntimeConfiguration{
+				Routers: generateHTTPRouters(19),
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/routers-many-lastpage.json",
+			},
+		},
+		{
+			desc: "all routers, pagination, 5 results overall, 10 res per page, want page 2",
+			path: "/api/http/routers?page=2&per_page=10",
+			conf: config.RuntimeConfiguration{
+				Routers: generateHTTPRouters(5),
+			},
+			expected: expected{
+				statusCode: http.StatusBadRequest,
+			},
+		},
+		{
+			desc: "all routers, pagination, 10 results overall, 10 res per page, want page 2",
+			path: "/api/http/routers?page=2&per_page=10",
+			conf: config.RuntimeConfiguration{
+				Routers: generateHTTPRouters(10),
+			},
+			expected: expected{
+				statusCode: http.StatusBadRequest,
+			},
+		},
+		{
+			desc: "one router by id",
+			path: "/api/http/routers/myprovider.bar",
+			conf: config.RuntimeConfiguration{
+				Routers: map[string]*config.RouterInfo{
+					"myprovider.bar": {
+						Router: &config.Router{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar`)",
+							Middlewares: []string{"auth", "anotherprovider.addPrefixTest"},
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				jsonFile:   "testdata/router-bar.json",
+			},
+		},
+		{
+			desc: "one router by id, that does not exist",
+			path: "/api/http/routers/myprovider.foo",
+			conf: config.RuntimeConfiguration{
+				Routers: map[string]*config.RouterInfo{
+					"myprovider.bar": {
+						Router: &config.Router{
+							EntryPoints: []string{"web"},
+							Service:     "myprovider.foo-service",
+							Rule:        "Host(`foo.bar`)",
+							Middlewares: []string{"auth", "anotherprovider.addPrefixTest"},
+						},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+		{
+			desc: "one router by id, but no config",
+			path: "/api/http/routers/myprovider.foo",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+		{
+			desc: "all services, but no config",
+			path: "/api/http/services",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/services-empty.json",
+			},
+		},
+		{
+			desc: "all services",
+			path: "/api/http/services",
+			conf: config.RuntimeConfiguration{
+				Services: map[string]*config.ServiceInfo{
+					"myprovider.bar": func() *config.ServiceInfo {
+						si := &config.ServiceInfo{
+							Service: &config.Service{
+								LoadBalancer: &config.LoadBalancerService{
+									Servers: []config.Server{
+										{
+											URL: "http://127.0.0.1",
+										},
+									},
+								},
+							},
+							UsedBy: []string{"myprovider.foo", "myprovider.test"},
+						}
+						si.UpdateStatus("http://127.0.0.1", "UP")
+						return si
+					}(),
+					"myprovider.baz": func() *config.ServiceInfo {
+						si := &config.ServiceInfo{
+							Service: &config.Service{
+								LoadBalancer: &config.LoadBalancerService{
+									Servers: []config.Server{
+										{
+											URL: "http://127.0.0.2",
+										},
+									},
+								},
+							},
+							UsedBy: []string{"myprovider.foo"},
+						}
+						si.UpdateStatus("http://127.0.0.2", "UP")
+						return si
+					}(),
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/services.json",
+			},
+		},
+		{
+			desc: "all services, 1 res per page, want page 2",
+			path: "/api/http/services?page=2&per_page=1",
+			conf: config.RuntimeConfiguration{
+				Services: map[string]*config.ServiceInfo{
+					"myprovider.bar": func() *config.ServiceInfo {
+						si := &config.ServiceInfo{
+							Service: &config.Service{
+								LoadBalancer: &config.LoadBalancerService{
+									Servers: []config.Server{
+										{
+											URL: "http://127.0.0.1",
+										},
+									},
+								},
+							},
+							UsedBy: []string{"myprovider.foo", "myprovider.test"},
+						}
+						si.UpdateStatus("http://127.0.0.1", "UP")
+						return si
+					}(),
+					"myprovider.baz": func() *config.ServiceInfo {
+						si := &config.ServiceInfo{
+							Service: &config.Service{
+								LoadBalancer: &config.LoadBalancerService{
+									Servers: []config.Server{
+										{
+											URL: "http://127.0.0.2",
+										},
+									},
+								},
+							},
+							UsedBy: []string{"myprovider.foo"},
+						}
+						si.UpdateStatus("http://127.0.0.2", "UP")
+						return si
+					}(),
+					"myprovider.test": func() *config.ServiceInfo {
+						si := &config.ServiceInfo{
+							Service: &config.Service{
+								LoadBalancer: &config.LoadBalancerService{
+									Servers: []config.Server{
+										{
+											URL: "http://127.0.0.3",
+										},
+									},
+								},
+							},
+							UsedBy: []string{"myprovider.foo", "myprovider.test"},
+						}
+						si.UpdateStatus("http://127.0.0.4", "UP")
+						return si
+					}(),
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "3",
+				jsonFile:   "testdata/services-page2.json",
+			},
+		},
+		{
+			desc: "one service by id",
+			path: "/api/http/services/myprovider.bar",
+			conf: config.RuntimeConfiguration{
+				Services: map[string]*config.ServiceInfo{
+					"myprovider.bar": func() *config.ServiceInfo {
+						si := &config.ServiceInfo{
+							Service: &config.Service{
+								LoadBalancer: &config.LoadBalancerService{
+									Servers: []config.Server{
+										{
+											URL: "http://127.0.0.1",
+										},
+									},
+								},
+							},
+							UsedBy: []string{"myprovider.foo", "myprovider.test"},
+						}
+						si.UpdateStatus("http://127.0.0.1", "UP")
+						return si
+					}(),
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				jsonFile:   "testdata/service-bar.json",
+			},
+		},
+		{
+			desc: "one service by id, that does not exist",
+			path: "/api/http/services/myprovider.nono",
+			conf: config.RuntimeConfiguration{
+				Services: map[string]*config.ServiceInfo{
+					"myprovider.bar": func() *config.ServiceInfo {
+						si := &config.ServiceInfo{
+							Service: &config.Service{
+								LoadBalancer: &config.LoadBalancerService{
+									Servers: []config.Server{
+										{
+											URL: "http://127.0.0.1",
+										},
+									},
+								},
+							},
+							UsedBy: []string{"myprovider.foo", "myprovider.test"},
+						}
+						si.UpdateStatus("http://127.0.0.1", "UP")
+						return si
+					}(),
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+		{
+			desc: "one service by id, but no config",
+			path: "/api/http/services/myprovider.foo",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+		{
+			desc: "all middlewares, but no config",
+			path: "/api/http/middlewares",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/middlewares-empty.json",
+			},
+		},
+		{
+			desc: "all middlewares",
+			path: "/api/http/middlewares",
+			conf: config.RuntimeConfiguration{
+				Middlewares: map[string]*config.MiddlewareInfo{
+					"myprovider.auth": {
+						Middleware: &config.Middleware{
+							BasicAuth: &config.BasicAuth{
+								Users: []string{"admin:admin"},
+							},
+						},
+						UsedBy: []string{"myprovider.bar", "myprovider.test"},
+					},
+					"myprovider.addPrefixTest": {
+						Middleware: &config.Middleware{
+							AddPrefix: &config.AddPrefix{
+								Prefix: "/titi",
+							},
+						},
+						UsedBy: []string{"myprovider.test"},
+					},
+					"anotherprovider.addPrefixTest": {
+						Middleware: &config.Middleware{
+							AddPrefix: &config.AddPrefix{
+								Prefix: "/toto",
+							},
+						},
+						UsedBy: []string{"myprovider.bar"},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "1",
+				jsonFile:   "testdata/middlewares.json",
+			},
+		},
+		{
+			desc: "all middlewares, 1 res per page, want page 2",
+			path: "/api/http/middlewares?page=2&per_page=1",
+			conf: config.RuntimeConfiguration{
+				Middlewares: map[string]*config.MiddlewareInfo{
+					"myprovider.auth": {
+						Middleware: &config.Middleware{
+							BasicAuth: &config.BasicAuth{
+								Users: []string{"admin:admin"},
+							},
+						},
+						UsedBy: []string{"myprovider.bar", "myprovider.test"},
+					},
+					"myprovider.addPrefixTest": {
+						Middleware: &config.Middleware{
+							AddPrefix: &config.AddPrefix{
+								Prefix: "/titi",
+							},
+						},
+						UsedBy: []string{"myprovider.test"},
+					},
+					"anotherprovider.addPrefixTest": {
+						Middleware: &config.Middleware{
+							AddPrefix: &config.AddPrefix{
+								Prefix: "/toto",
+							},
+						},
+						UsedBy: []string{"myprovider.bar"},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				nextPage:   "3",
+				jsonFile:   "testdata/middlewares-page2.json",
+			},
+		},
+		{
+			desc: "one middleware by id",
+			path: "/api/http/middlewares/myprovider.auth",
+			conf: config.RuntimeConfiguration{
+				Middlewares: map[string]*config.MiddlewareInfo{
+					"myprovider.auth": {
+						Middleware: &config.Middleware{
+							BasicAuth: &config.BasicAuth{
+								Users: []string{"admin:admin"},
+							},
+						},
+						UsedBy: []string{"myprovider.bar", "myprovider.test"},
+					},
+					"myprovider.addPrefixTest": {
+						Middleware: &config.Middleware{
+							AddPrefix: &config.AddPrefix{
+								Prefix: "/titi",
+							},
+						},
+						UsedBy: []string{"myprovider.test"},
+					},
+					"anotherprovider.addPrefixTest": {
+						Middleware: &config.Middleware{
+							AddPrefix: &config.AddPrefix{
+								Prefix: "/toto",
+							},
+						},
+						UsedBy: []string{"myprovider.bar"},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusOK,
+				jsonFile:   "testdata/middleware-auth.json",
+			},
+		},
+		{
+			desc: "one middleware by id, that does not exist",
+			path: "/api/http/middlewares/myprovider.foo",
+			conf: config.RuntimeConfiguration{
+				Middlewares: map[string]*config.MiddlewareInfo{
+					"myprovider.auth": {
+						Middleware: &config.Middleware{
+							BasicAuth: &config.BasicAuth{
+								Users: []string{"admin:admin"},
+							},
+						},
+						UsedBy: []string{"myprovider.bar", "myprovider.test"},
+					},
+				},
+			},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+		{
+			desc: "one middleware by id, but no config",
+			path: "/api/http/middlewares/myprovider.foo",
+			conf: config.RuntimeConfiguration{},
+			expected: expected{
+				statusCode: http.StatusNotFound,
+			},
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			rtConf := &test.conf
+			handler := New(static.Configuration{API: &static.API{}, Global: &static.Global{}}, rtConf)
+			router := mux.NewRouter()
+			handler.Append(router)
+
+			server := httptest.NewServer(router)
+
+			resp, err := http.DefaultClient.Get(server.URL + test.path)
+			require.NoError(t, err)
+
+			require.Equal(t, test.expected.statusCode, resp.StatusCode)
+
+			assert.Equal(t, test.expected.nextPage, resp.Header.Get(nextPageHeader))
+
+			if test.expected.jsonFile == "" {
+				return
+			}
+
+			contents, err := ioutil.ReadAll(resp.Body)
+			require.NoError(t, err)
+
+			err = resp.Body.Close()
+			require.NoError(t, err)
+
+			if *updateExpected {
+				var results interface{}
+				err := json.Unmarshal(contents, &results)
+				require.NoError(t, err)
+
+				newJSON, err := json.MarshalIndent(results, "", "\t")
+				require.NoError(t, err)
+
+				err = ioutil.WriteFile(test.expected.jsonFile, newJSON, 0644)
+				require.NoError(t, err)
+			}
+
+			data, err := ioutil.ReadFile(test.expected.jsonFile)
+			require.NoError(t, err)
+			assert.JSONEq(t, string(data), string(contents))
+		})
+	}
+
+}
+
 func TestHandler_Configuration(t *testing.T) {
 	type expected struct {
 		statusCode int
@@ -130,11 +1008,13 @@ func TestHandler_Configuration(t *testing.T) {
 		t.Run(test.desc, func(t *testing.T) {
 			t.Parallel()
 
+			// TODO: server status
+
 			rtConf := &test.conf
+			rtConf.PopulateUsedBy()
 			handler := New(static.Configuration{API: &static.API{}, Global: &static.Global{}}, rtConf)
 			router := mux.NewRouter()
 			handler.Append(router)
-			rtConf.PopulateUsedBy()
 
 			server := httptest.NewServer(router)
 
@@ -170,3 +1050,17 @@ func TestHandler_Configuration(t *testing.T) {
 		})
 	}
 }
+
+func generateHTTPRouters(nbRouters int) map[string]*config.RouterInfo {
+	routers := make(map[string]*config.RouterInfo, nbRouters)
+	for i := 0; i < nbRouters; i++ {
+		routers[fmt.Sprintf("myprovider.bar%2d", i)] = &config.RouterInfo{
+			Router: &config.Router{
+				EntryPoints: []string{"web"},
+				Service:     "myprovider.foo-service",
+				Rule:        "Host(`foo.bar" + strconv.Itoa(i) + "`)",
+			},
+		}
+	}
+	return routers
+}

pkg/api/testdata/middleware-auth.json

@@ -0,0 +1,13 @@
+{
+	"basicAuth": {
+		"users": [
+			"admin:admin"
+		]
+	},
+	"name": "myprovider.auth",
+	"provider": "myprovider",
+	"usedBy": [
+		"myprovider.bar",
+		"myprovider.test"
+	]
+}

pkg/api/testdata/middlewares-empty.json

@@ -0,0 +1 @@
+[]

pkg/api/testdata/middlewares-page2.json

@@ -0,0 +1,12 @@
+[
+	{
+		"addPrefix": {
+			"prefix": "/titi"
+		},
+		"name": "myprovider.addPrefixTest",
+		"provider": "myprovider",
+		"usedBy": [
+			"myprovider.test"
+		]
+	}
+]

pkg/api/testdata/middlewares.json

@@ -0,0 +1,35 @@
+[
+	{
+		"addPrefix": {
+			"prefix": "/toto"
+		},
+		"name": "anotherprovider.addPrefixTest",
+		"provider": "anotherprovider",
+		"usedBy": [
+			"myprovider.bar"
+		]
+	},
+	{
+		"addPrefix": {
+			"prefix": "/titi"
+		},
+		"name": "myprovider.addPrefixTest",
+		"provider": "myprovider",
+		"usedBy": [
+			"myprovider.test"
+		]
+	},
+	{
+		"basicAuth": {
+			"users": [
+				"admin:admin"
+			]
+		},
+		"name": "myprovider.auth",
+		"provider": "myprovider",
+		"usedBy": [
+			"myprovider.bar",
+			"myprovider.test"
+		]
+	}
+]

pkg/api/testdata/router-bar.json

@@ -0,0 +1,13 @@
+{
+	"entryPoints": [
+		"web"
+	],
+	"middlewares": [
+		"auth",
+		"anotherprovider.addPrefixTest"
+	],
+	"name": "myprovider.bar",
+	"provider": "myprovider",
+	"rule": "Host(`foo.bar`)",
+	"service": "myprovider.foo-service"
+}

pkg/api/testdata/routers-empty.json

@@ -0,0 +1 @@
+[]

pkg/api/testdata/routers-many-lastpage.json

@@ -0,0 +1,47 @@
+[
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.bar14",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar14`)",
+		"service": "myprovider.foo-service"
+	},
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.bar15",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar15`)",
+		"service": "myprovider.foo-service"
+	},
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.bar16",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar16`)",
+		"service": "myprovider.foo-service"
+	},
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.bar17",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar17`)",
+		"service": "myprovider.foo-service"
+	},
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.bar18",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar18`)",
+		"service": "myprovider.foo-service"
+	}
+]

pkg/api/testdata/routers-page2.json

@@ -0,0 +1,11 @@
+[
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.baz",
+		"provider": "myprovider",
+		"rule": "Host(`toto.bar`)",
+		"service": "myprovider.foo-service"
+	}
+]

pkg/api/testdata/routers.json

@@ -0,0 +1,28 @@
+[
+	{
+		"entryPoints": [
+			"web"
+		],
+		"middlewares": [
+			"auth",
+			"anotherprovider.addPrefixTest"
+		],
+		"name": "myprovider.bar",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar`)",
+		"service": "myprovider.foo-service"
+	},
+	{
+		"entryPoints": [
+			"web"
+		],
+		"middlewares": [
+			"addPrefixTest",
+			"auth"
+		],
+		"name": "myprovider.test",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar.other`)",
+		"service": "myprovider.foo-service"
+	}
+]

pkg/api/testdata/service-bar.json

@@ -0,0 +1,19 @@
+{
+	"loadbalancer": {
+		"passHostHeader": false,
+		"servers": [
+			{
+				"url": "http://127.0.0.1"
+			}
+		]
+	},
+	"name": "myprovider.bar",
+	"provider": "myprovider",
+	"serverStatus": {
+		"http://127.0.0.1": "UP"
+	},
+	"usedBy": [
+		"myprovider.foo",
+		"myprovider.test"
+	]
+}

pkg/api/testdata/services-empty.json

@@ -0,0 +1 @@
+[]

pkg/api/testdata/services-page2.json

@@ -0,0 +1,20 @@
+[
+	{
+		"loadbalancer": {
+			"passHostHeader": false,
+			"servers": [
+				{
+					"url": "http://127.0.0.2"
+				}
+			]
+		},
+		"name": "myprovider.baz",
+		"provider": "myprovider",
+		"serverStatus": {
+			"http://127.0.0.2": "UP"
+		},
+		"usedBy": [
+			"myprovider.foo"
+		]
+	}
+]

pkg/api/testdata/services.json

@@ -0,0 +1,39 @@
+[
+	{
+		"loadbalancer": {
+			"passHostHeader": false,
+			"servers": [
+				{
+					"url": "http://127.0.0.1"
+				}
+			]
+		},
+		"name": "myprovider.bar",
+		"provider": "myprovider",
+		"serverStatus": {
+			"http://127.0.0.1": "UP"
+		},
+		"usedBy": [
+			"myprovider.foo",
+			"myprovider.test"
+		]
+	},
+	{
+		"loadbalancer": {
+			"passHostHeader": false,
+			"servers": [
+				{
+					"url": "http://127.0.0.2"
+				}
+			]
+		},
+		"name": "myprovider.baz",
+		"provider": "myprovider",
+		"serverStatus": {
+			"http://127.0.0.2": "UP"
+		},
+		"usedBy": [
+			"myprovider.foo"
+		]
+	}
+]

pkg/api/testdata/tcprouter-bar.json

@@ -0,0 +1,9 @@
+{
+	"entryPoints": [
+		"web"
+	],
+	"name": "myprovider.bar",
+	"provider": "myprovider",
+	"rule": "Host(`foo.bar`)",
+	"service": "myprovider.foo-service"
+}

pkg/api/testdata/tcprouters-empty.json

@@ -0,0 +1 @@
+[]

pkg/api/testdata/tcprouters-page2.json

@@ -0,0 +1,11 @@
+[
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.baz",
+		"provider": "myprovider",
+		"rule": "Host(`toto.bar`)",
+		"service": "myprovider.foo-service"
+	}
+]

pkg/api/testdata/tcprouters.json

@@ -0,0 +1,23 @@
+[
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.bar",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar`)",
+		"service": "myprovider.foo-service"
+	},
+	{
+		"entryPoints": [
+			"web"
+		],
+		"name": "myprovider.test",
+		"provider": "myprovider",
+		"rule": "Host(`foo.bar.other`)",
+		"service": "myprovider.foo-service",
+		"tls": {
+			"passthrough": false
+		}
+	}
+]

pkg/api/testdata/tcpservice-bar.json

@@ -0,0 +1,15 @@
+{
+	"loadbalancer": {
+		"servers": [
+			{
+				"address": "127.0.0.1:2345"
+			}
+		]
+	},
+	"name": "myprovider.bar",
+	"provider": "myprovider",
+	"usedBy": [
+		"myprovider.foo",
+		"myprovider.test"
+	]
+}

pkg/api/testdata/tcpservices-empty.json

@@ -0,0 +1 @@
+[]

pkg/api/testdata/tcpservices-page2.json

@@ -0,0 +1,16 @@
+[
+	{
+		"loadbalancer": {
+			"servers": [
+				{
+					"address": "127.0.0.2:2345"
+				}
+			]
+		},
+		"name": "myprovider.baz",
+		"provider": "myprovider",
+		"usedBy": [
+			"myprovider.foo"
+		]
+	}
+]

pkg/api/testdata/tcpservices.json

@@ -0,0 +1,31 @@
+[
+	{
+		"loadbalancer": {
+			"servers": [
+				{
+					"address": "127.0.0.1:2345"
+				}
+			]
+		},
+		"name": "myprovider.bar",
+		"provider": "myprovider",
+		"usedBy": [
+			"myprovider.foo",
+			"myprovider.test"
+		]
+	},
+	{
+		"loadbalancer": {
+			"servers": [
+				{
+					"address": "127.0.0.2:2345"
+				}
+			]
+		},
+		"name": "myprovider.baz",
+		"provider": "myprovider",
+		"usedBy": [
+			"myprovider.foo"
+		]
+	}
+]

pkg/config/static/static_config.go

@@ -66,7 +66,6 @@ type Configuration struct {
 
 // Global holds the global configuration.
 type Global struct {
-	Debug              bool  `description:"Enable debug mode." export:"true"`
 	CheckNewVersion    bool  `description:"Periodically check if a new version has been released." export:"true"`
 	SendAnonymousUsage *bool `description:"Periodically send anonymous usage statistics. If the option is not specified, it will be enabled by default." export:"true"`
 }
@@ -81,8 +80,9 @@ type ServersTransport struct {
 
 // API holds the API configuration
 type API struct {
-	EntryPoint      string            `description:"EntryPoint." export:"true"`
+	EntryPoint      string            `description:"The entry point that the API handler will be bound to." export:"true"`
 	Dashboard       bool              `description:"Activate dashboard." export:"true"`
+	Debug           bool              `description:"Enable additional endpoints for debugging and profiling." export:"true"`
 	Statistics      *types.Statistics `description:"Enable more detailed statistics." export:"true" label:"allowEmpty"`
 	Middlewares     []string          `description:"Middleware list." export:"true"`
 	DashboardAssets *assetfs.AssetFS  `json:"-" label:"-"`