Add GrpcWeb middleware

Co-authored-by: Kevin Pollet <pollet.kevin@gmail.com>

docs/content/middlewares/http/grpcweb.md

@@ -0,0 +1,77 @@
+---
+title: "Traefik GrpcWeb Documentation"
+description: "In Traefik Proxy's HTTP middleware, GrpcWeb converts a gRPC Web requests to HTTP/2 gRPC requests. Read the technical documentation."
+---
+
+# GrpcWeb
+
+Converting gRPC Web requests to HTTP/2 gRPC requests.
+{: .subtitle }
+
+The GrpcWeb middleware converts gRPC Web requests to HTTP/2 gRPC requests before forwarding them to the backends.
+
+!!! tip
+
+    Please note, that Traefik needs to communicate using gRPC with the backends (h2c or HTTP/2 over TLS).
+    Check out the [gRPC](../../user-guides/grpc.md) user guide for more details.
+
+## Configuration Examples
+
+```yaml tab="Docker"
+labels:
+  - "traefik.http.middlewares.test-grpcweb.grpcweb.allowOrigins=*"
+```
+
+```yaml tab="Kubernetes"
+apiVersion: traefik.containo.us/v1alpha1
+kind: Middleware
+metadata:
+  name: test-grpcweb
+spec:
+  grpcWeb:
+    allowOrigins:
+      - "*"
+```
+
+```yaml tab="Consul Catalog"
+- "traefik.http.middlewares.test-grpcweb.grpcWeb.allowOrigins=*"
+```
+
+```json tab="Marathon"
+"labels": {
+  "traefik.http.middlewares.test-grpcweb.grpcweb.alloworigins": "*"
+}
+```
+
+```yaml tab="Rancher"
+labels:
+  - "traefik.http.middlewares.test-grpcweb.grpcweb.alloworigins=*"
+```
+
+```yaml tab="File (YAML)"
+http:
+  middlewares:
+    test-grpcweb:
+      grpcWeb:
+        allowOrigins:
+          - "*"
+```
+
+```toml tab="File (TOML)"
+[http.middlewares]
+  [http.middlewares.test-grpcweb.grpcWeb]
+    allowOrigins = ["*"]
+```
+
+## Configuration Options
+
+### `allowOrigins`
+
+The `allowOrigins` contains the list of allowed origins.
+A wildcard origin `*` can also be configured to match all requests.
+
+More information including how to use the settings can be found at:
+
+- [Mozilla.org](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin)
+- [w3](https://fetch.spec.whatwg.org/#http-access-control-allow-origin)
+- [IETF](https://tools.ietf.org/html/rfc6454#section-7.1)

docs/content/reference/dynamic-configuration/docker-labels.yml

@@ -121,6 +121,7 @@
 - "traefik.http.middlewares.middleware21.stripprefix.forceslash=true"
 - "traefik.http.middlewares.middleware21.stripprefix.prefixes=foobar, foobar"
 - "traefik.http.middlewares.middleware22.stripprefixregex.regex=foobar, foobar"
+- "traefik.http.middlewares.middleware23.grpcweb.alloworigins=foobar, foobar"
 - "traefik.http.routers.router0.entrypoints=foobar, foobar"
 - "traefik.http.routers.router0.middlewares=foobar, foobar"
 - "traefik.http.routers.router0.priority=42"

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

@@ -285,6 +285,9 @@
     [http.middlewares.Middleware22]
       [http.middlewares.Middleware22.stripPrefixRegex]
         regex = ["foobar", "foobar"]
+    [http.middlewares.Middleware23]
+      [http.middlewares.Middleware23.grpcWeb]
+        allowOrigins = ["foobar", "foobar"]
   [http.serversTransports]
     [http.serversTransports.ServersTransport0]
       serverName = "foobar"

docs/content/reference/dynamic-configuration/file.yaml

@@ -324,6 +324,11 @@ http:
         regex:
           - foobar
           - foobar
+    Middleware23:
+      grpcWeb:
+        allowOrigins:
+          - foobar
+          - foobar
   serversTransports:
     ServersTransport0:
       serverName: foobar

docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml

@@ -967,6 +967,17 @@ spec:
                       forward) all X-Forwarded-* headers.'
                     type: boolean
                 type: object
+              grpcWeb:
+                description: GrpcWeb holds the gRPC web middleware configuration.
+                  This middleware converts a gRPC web request to an HTTP/2 gRPC request.
+                properties:
+                  allowOrigins:
+                    description: AllowOrigins is a list of allowable origins. Can
+                      also be a wildcard origin "*".
+                    items:
+                      type: string
+                    type: array
+                type: object
               headers:
                 description: 'Headers holds the headers middleware configuration.
                   This middleware manages the requests and responses headers. More

docs/content/reference/dynamic-configuration/kv-ref.md

@@ -140,6 +140,8 @@
 | `traefik/http/middlewares/Middleware21/stripPrefix/prefixes/1` | `foobar` |
 | `traefik/http/middlewares/Middleware22/stripPrefixRegex/regex/0` | `foobar` |
 | `traefik/http/middlewares/Middleware22/stripPrefixRegex/regex/1` | `foobar` |
+| `traefik/http/middlewares/Middleware23/grpcWeb/allowOrigins/0` | `foobar` |
+| `traefik/http/middlewares/Middleware23/grpcWeb/allowOrigins/1` | `foobar` |
 | `traefik/http/routers/Router0/entryPoints/0` | `foobar` |
 | `traefik/http/routers/Router0/entryPoints/1` | `foobar` |
 | `traefik/http/routers/Router0/middlewares/0` | `foobar` |

docs/content/reference/dynamic-configuration/marathon-labels.json

@@ -121,6 +121,7 @@
 "traefik.http.middlewares.middleware21.stripprefix.forceslash": "true",
 "traefik.http.middlewares.middleware21.stripprefix.prefixes": "foobar, foobar",
 "traefik.http.middlewares.middleware22.stripprefixregex.regex": "foobar, foobar",
+"traefik.http.middlewares.middleware23.grpcweb.alloworigins": "foobar, foobar",
 "traefik.http.routers.router0.entrypoints": "foobar, foobar",
 "traefik.http.routers.router0.middlewares": "foobar, foobar",
 "traefik.http.routers.router0.priority": "42",

docs/content/reference/dynamic-configuration/traefik.containo.us_middlewares.yaml

@@ -390,6 +390,17 @@ spec:
                       forward) all X-Forwarded-* headers.'
                     type: boolean
                 type: object
+              grpcWeb:
+                description: GrpcWeb holds the gRPC web middleware configuration.
+                  This middleware converts a gRPC web request to an HTTP/2 gRPC request.
+                properties:
+                  allowOrigins:
+                    description: AllowOrigins is a list of allowable origins. Can
+                      also be a wildcard origin "*".
+                    items:
+                      type: string
+                    type: array
+                type: object
               headers:
                 description: 'Headers holds the headers middleware configuration.
                   This middleware manages the requests and responses headers. More

docs/mkdocs.yml

@@ -125,6 +125,7 @@ nav:
         - 'DigestAuth': 'middlewares/http/digestauth.md'
         - 'Errors': 'middlewares/http/errorpages.md'
         - 'ForwardAuth': 'middlewares/http/forwardauth.md'
+        - 'GrpcWeb': 'middlewares/http/grpcweb.md'
         - 'Headers': 'middlewares/http/headers.md'
         - 'IpAllowList': 'middlewares/http/ipallowlist.md'
         - 'InFlightReq': 'middlewares/http/inflightreq.md'

go.mod

@@ -32,6 +32,7 @@ require (
 	github.com/hashicorp/go-multierror v1.1.1
 	github.com/hashicorp/go-version v1.6.0
 	github.com/hashicorp/nomad/api v0.0.0-20220506174431-b5665129cd1f
+	github.com/improbable-eng/grpc-web v0.15.0
 	github.com/influxdata/influxdb-client-go/v2 v2.7.0
 	github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d
 	github.com/instana/go-sensor v1.38.3
@@ -142,6 +143,7 @@ require (
 	github.com/coreos/go-systemd/v22 v22.3.2 // indirect
 	github.com/cpu/goacmedns v0.1.1 // indirect
 	github.com/deepmap/oapi-codegen v1.9.1 // indirect
+	github.com/desertbit/timer v0.0.0-20180107155436-c41aec40b27f // indirect
 	github.com/dgraph-io/ristretto v0.1.0 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/dimchansky/utfbom v1.1.1 // indirect
@@ -189,7 +191,7 @@ require (
 	github.com/gophercloud/gophercloud v1.0.0 // indirect
 	github.com/gophercloud/utils v0.0.0-20210216074907-f6de111f2eae // indirect
 	github.com/gravitational/trace v1.1.16-0.20220114165159-14a9a7dd6aaf // indirect
-	github.com/grpc-ecosystem/go-grpc-middleware v1.2.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-middleware v1.2.2 // indirect
 	github.com/grpc-ecosystem/grpc-opentracing v0.0.0-20180507213350-8e809c8a8645 // indirect
 	github.com/hashicorp/consul/sdk v0.10.0 // indirect
 	github.com/hashicorp/cronexpr v1.1.1 // indirect
@@ -280,6 +282,7 @@ require (
 	github.com/pquerna/otp v1.3.0 // indirect
 	github.com/prometheus/common v0.35.0 // indirect
 	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/rs/cors v1.7.0 // indirect
 	github.com/sacloud/api-client-go v0.2.1 // indirect
 	github.com/sacloud/go-http v0.1.2 // indirect
 	github.com/sacloud/iaas-api-go v1.3.2 // indirect
@@ -343,6 +346,7 @@ require (
 	howett.net/plist v0.0.0-20181124034731-591f970eefbb // indirect
 	k8s.io/klog/v2 v2.10.0 // indirect
 	k8s.io/kube-openapi v0.0.0-20210421082810-95288971da7e // indirect
+	nhooyr.io/websocket v1.8.6 // indirect
 	sigs.k8s.io/structured-merge-diff/v4 v4.1.2 // indirect
 	sigs.k8s.io/yaml v1.2.0 // indirect
 )

go.sum

@@ -522,6 +522,8 @@ github.com/denisenkom/go-mssqldb v0.0.0-20200428022330-06a60b6afbbc/go.mod h1:xb
 github.com/denisenkom/go-mssqldb v0.11.0/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU=
 github.com/denverdino/aliyungo v0.0.0-20170926055100-d3308649c661/go.mod h1:dV8lFg6daOBZbT6/BDGIz6Y3WFGn8juu6G+CQ6LHtl0=
 github.com/denverdino/aliyungo v0.0.0-20190125010748-a747050bb1ba/go.mod h1:dV8lFg6daOBZbT6/BDGIz6Y3WFGn8juu6G+CQ6LHtl0=
+github.com/desertbit/timer v0.0.0-20180107155436-c41aec40b27f h1:U5y3Y5UE0w7amNe7Z5G/twsBW0KEalRQXZzf8ufSh9I=
+github.com/desertbit/timer v0.0.0-20180107155436-c41aec40b27f/go.mod h1:xH/i4TFMt8koVQZ6WFms69WAsDWr2XsYL3Hkl7jkoLE=
 github.com/dgraph-io/ristretto v0.1.0 h1:Jv3CGQHp9OjuMBSne1485aDpUkTKEcUqF+jm/LuerPI=
 github.com/dgraph-io/ristretto v0.1.0/go.mod h1:fux0lOrBhrVCJd3lcTHsIJhq1T2rokOu6v9Vcb3Q9ug=
 github.com/dgrijalva/jwt-go v0.0.0-20170104182250-a601269ab70c/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
@@ -681,8 +683,11 @@ github.com/getsentry/raven-go v0.0.0-20180121060056-563b81fc02b7/go.mod h1:KungG
 github.com/ghodss/yaml v0.0.0-20150909031657-73d445a93680/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/ghodss/yaml v1.0.0 h1:wQHKEahhL6wmXdzwWG11gIVCkOv05bNOh+Rxn0yngAk=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
+github.com/gin-gonic/gin v1.6.3/go.mod h1:75u5sXoLsGZoRN5Sgbi1eraJ4GU3++wFwWzhwvtwp4M=
 github.com/gin-gonic/gin v1.7.0/go.mod h1:jD2toBW3GZUr5UMcdrwQA10I7RuaFOl/SGeDjXkfUtY=
+github.com/gin-gonic/gin v1.7.4 h1:QmUZXrvJ9qZ3GfWvQ+2wnW/1ePrTEJqPKMYEU3lD/DM=
 github.com/gin-gonic/gin v1.7.4/go.mod h1:jD2toBW3GZUr5UMcdrwQA10I7RuaFOl/SGeDjXkfUtY=
 github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
 github.com/globalsign/mgo v0.0.0-20181015135952-eeefdecb41b8/go.mod h1:xkRDCp4j0OGD1HRkm4kmhM+pmpv3AKq5SU7GMg4oO/Q=
@@ -700,6 +705,7 @@ github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2
 github.com/go-ini/ini v1.25.4/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
+github.com/go-kit/kit v0.10.0/go.mod h1:xUsJbQ/Fp4kEt7AFgCuvyX4a71u8h9jB8tj/ORgOZ7o=
 github.com/go-kit/kit v0.10.1-0.20200915143503-439c4d2ed3ea h1:CnEQOUv4ilElSwFB9g/lVmz206oLE4aNZDYngIY1Gvg=
 github.com/go-kit/kit v0.10.1-0.20200915143503-439c4d2ed3ea/go.mod h1:xUsJbQ/Fp4kEt7AFgCuvyX4a71u8h9jB8tj/ORgOZ7o=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
@@ -735,11 +741,15 @@ github.com/go-pg/pg/v10 v10.0.0/go.mod h1:XHU1AkQW534GFuUdSiQ46+Xw6Ah+9+b8DlT4Yw
 github.com/go-pg/zerochecker v0.2.0/go.mod h1:NJZ4wKL0NmTtz0GKCoJ8kym6Xn/EQzXRl2OnAe7MmDo=
 github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
+github.com/go-playground/locales v0.14.0 h1:u50s323jtVGugKlcYeyzC0etD1HifMjqmJqb8WugfUU=
 github.com/go-playground/locales v0.14.0/go.mod h1:sawfccIbzZTqEDETgFXqTho0QybSa7l++s0DH+LDiLs=
 github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
+github.com/go-playground/universal-translator v0.18.0 h1:82dyy6p4OuJq4/CByFNOn/jYrnRPArHwAcmLoJZxyho=
 github.com/go-playground/universal-translator v0.18.0/go.mod h1:UvRDBj+xPUEGrFYl+lu/H90nyDXpg0fqeB/AQUGNTVA=
+github.com/go-playground/validator/v10 v10.2.0/go.mod h1:uOYAAleCW8F/7oMFd6aG0GOhaH6EGOAJShg8Id5JGkI=
 github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
 github.com/go-playground/validator/v10 v10.9.0/go.mod h1:74x4gJWsvQexRdW8Pn3dXSGrTK4nAUsbPlLADvpJkos=
+github.com/go-playground/validator/v10 v10.11.0 h1:0W+xRM511GY47Yy3bZUbJVitCNg2BOGlCyvTqsp/xIw=
 github.com/go-redis/redis v6.15.9+incompatible/go.mod h1:NAIEuMOZ/fxfXJIrKDQDz8wamY7mA7PouImQ2Jvg6kA=
 github.com/go-redis/redis/v7 v7.1.0/go.mod h1:JDNMw23GTyLNC4GZu9njt15ctBQVn7xjRfnwdHj/Dcg=
 github.com/go-redis/redis/v8 v8.0.0/go.mod h1:isLoQT/NFSP7V67lyvM9GmdvLdyZ7pEhsXvvyQtnQTo=
@@ -788,6 +798,12 @@ github.com/gobuffalo/packd v0.1.0/go.mod h1:M2Juc+hhDXf/PnmBANFCqx4DM3wRbgDvnVWe
 github.com/gobuffalo/packr/v2 v2.0.9/go.mod h1:emmyGweYTm6Kdper+iywB6YK5YzuKchGtJQZ0Odn4pQ=
 github.com/gobuffalo/packr/v2 v2.2.0/go.mod h1:CaAwI0GPIAv+5wKLtv8Afwl+Cm78K/I/VCm/3ptBN+0=
 github.com/gobuffalo/syncx v0.0.0-20190224160051-33c29581e754/go.mod h1:HhnNqWY95UYwwW3uSASeV7vtgYkT2t16hJgV3AEPUpw=
+github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee h1:s+21KNqlpePfkah2I+gwHF8xmJWRjooY+5248k6m4A0=
+github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee/go.mod h1:L0fX3K22YWvt/FAX9NnzrNzcI4wNYi9Yku4O0LKYflo=
+github.com/gobwas/pool v0.2.0 h1:QEmUOlnSjWtnpRGHF3SauEiOsy82Cup83Vf2LcMlnc8=
+github.com/gobwas/pool v0.2.0/go.mod h1:q8bcK0KcYlCgd9e7WYLm9LpyS+YeLd8JVDW6WezmKEw=
+github.com/gobwas/ws v1.0.2 h1:CoAavW/wd/kulfZmSIBt6p24n4j7tHgNVCjsfHVNUbo=
+github.com/gobwas/ws v1.0.2/go.mod h1:szmBTxLgaFppYjEmNtny/v3w89xOydFnnZMcgRRu/EM=
 github.com/goccy/go-json v0.7.8/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/gocql/gocql v0.0.0-20220224095938-0eacd3183625/go.mod h1:3gM2c4D3AnkISwBxGnMMsS8Oy4y2lhbPRsH4xnJrHG8=
 github.com/godbus/dbus v0.0.0-20151105175453-c7fdd8b5cd55/go.mod h1:/YcGZj5zSblfDWMMoOzV4fas9FZnQYTkDnsGvmh2Grw=
@@ -962,6 +978,7 @@ github.com/gorilla/handlers v0.0.0-20150720190736-60c7bfde3e33/go.mod h1:Qkdc/uu
 github.com/gorilla/handlers v1.5.1/go.mod h1:t8XrUpc4KVXb7HGyJ4/cEnwQiaxrX/hz1Zv/4g96P1Q=
 github.com/gorilla/websocket v0.0.0-20170926233335-4201258b820c/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
+github.com/gorilla/websocket v1.4.1/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
@@ -973,8 +990,9 @@ github.com/gregjones/httpcache v0.0.0-20170728041850-787624de3eb7/go.mod h1:Fecb
 github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
-github.com/grpc-ecosystem/go-grpc-middleware v1.2.0 h1:0IKlLyQ3Hs9nDaiK5cSHAGmcQEIC8l2Ts1u6x5Dfrqg=
 github.com/grpc-ecosystem/go-grpc-middleware v1.2.0/go.mod h1:mJzapYve32yjrKlk9GbyCZHuPgZsrbyIbyKhSzOpg6s=
+github.com/grpc-ecosystem/go-grpc-middleware v1.2.2 h1:FlFbCRLd5Jr4iYXZufAvgWN6Ao0JrI5chLINnUXDDr0=
+github.com/grpc-ecosystem/go-grpc-middleware v1.2.2/go.mod h1:EaizFBKfUKtMIF5iaDEhniwNedqGo9FuLFzppDr3uwI=
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@@ -1128,6 +1146,8 @@ github.com/imdario/mergo v0.3.10/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH
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@@ -1278,7 +1298,9 @@ github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+o
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@@ -1328,6 +1350,7 @@ github.com/labstack/echo/v4 v4.6.3/go.mod h1:Hk5OiHj0kDqmFq7aHe7eDqI7CUhuCrfpupQ
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@@ -1522,7 +1545,9 @@ github.com/mrunalp/fileutils v0.5.0/go.mod h1:M1WthSahJixYnrXQl/DFQuteStB1weuxD2
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@@ -1730,6 +1755,7 @@ github.com/prometheus/common v0.6.0/go.mod h1:eBmuwkDJBwy6iBfxCBob6t6dR6ENT/y+J+
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@@ -1748,6 +1774,7 @@ github.com/prometheus/procfs v0.0.5/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDa
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@@ -1769,6 +1796,8 @@ github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFR
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@@ -1982,9 +2011,11 @@ github.com/uber/jaeger-lib v2.2.0+incompatible h1:MxZXOiR2JuoANZ3J6DE/U0kSFv/eJ/
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@@ -2208,6 +2239,7 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
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@@ -2280,6 +2312,7 @@ golang.org/x/net v0.0.0-20200222125558-5a598a2470a0/go.mod h1:z5CRVTTTmAJ677TzLL
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@@ -2307,6 +2340,7 @@ golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qx
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@@ -2420,6 +2454,7 @@ golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -2470,6 +2505,7 @@ golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBc
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@@ -2676,6 +2712,7 @@ google.golang.org/genproto v0.0.0-20200228133532-8c2c7df3a383/go.mod h1:55QSHmfG
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 google.golang.org/genproto v0.0.0-20200511104702-f5ebc3bea380/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
 google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
@@ -2695,6 +2732,7 @@ google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a/go.mod h1:FWY/as6D
 google.golang.org/genproto v0.0.0-20201201144952-b05cb90ed32e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20201210142538-e3217bee35cc/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20201214200347-8c77b98c765d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
+google.golang.org/genproto v0.0.0-20210126160654-44e461bb6506/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210222152913-aa3ee6e6a81c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210303154014-9728d6b83eeb/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210310155132-4ce2db91004e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
@@ -2939,6 +2977,8 @@ launchpad.net/gocheck v0.0.0-20140225173054-000000000087/go.mod h1:hj7XX3B/0A+80
 mellium.im/sasl v0.2.1/go.mod h1:ROaEDLQNuf9vjKqE1SrAfnsobm2YKXT1gnN1uDp1PjQ=
 mvdan.cc/xurls/v2 v2.1.0 h1:KaMb5GLhlcSX+e+qhbRJODnUUBvlw01jt4yrjFIHAuA=
 mvdan.cc/xurls/v2 v2.1.0/go.mod h1:5GrSd9rOnKOpZaji1OZLYL/yeAAtGDlo/cFe+8K5n8E=
+nhooyr.io/websocket v1.8.6 h1:s+C3xAMLwGmlI31Nyn/eAehUlZPwfYZu2JXM621Q5/k=
+nhooyr.io/websocket v1.8.6/go.mod h1:B70DZP8IakI65RVQ51MsWP/8jndNma26DVA/nFSCgW0=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=

integration/fixtures/k8s/01-traefik-crd.yml

@@ -967,6 +967,17 @@ spec:
                       forward) all X-Forwarded-* headers.'
                     type: boolean
                 type: object
+              grpcWeb:
+                description: GrpcWeb holds the gRPC web middleware configuration.
+                  This middleware converts a gRPC web request to an HTTP/2 gRPC request.
+                properties:
+                  allowOrigins:
+                    description: AllowOrigins is a list of allowable origins. Can
+                      also be a wildcard origin "*".
+                    items:
+                      type: string
+                    type: array
+                type: object
               headers:
                 description: 'Headers holds the headers middleware configuration.
                   This middleware manages the requests and responses headers. More

pkg/config/dynamic/middlewares.go

@@ -34,12 +34,23 @@ type Middleware struct {
 	PassTLSClientCert *PassTLSClientCert `json:"passTLSClientCert,omitempty" toml:"passTLSClientCert,omitempty" yaml:"passTLSClientCert,omitempty" export:"true"`
 	Retry             *Retry             `json:"retry,omitempty" toml:"retry,omitempty" yaml:"retry,omitempty" export:"true"`
 	ContentType       *ContentType       `json:"contentType,omitempty" toml:"contentType,omitempty" yaml:"contentType,omitempty" export:"true"`
+	GrpcWeb           *GrpcWeb           `json:"grpcWeb,omitempty" toml:"grpcWeb,omitempty" yaml:"grpcWeb,omitempty" export:"true"`
 
 	Plugin map[string]PluginConf `json:"plugin,omitempty" toml:"plugin,omitempty" yaml:"plugin,omitempty" export:"true"`
 }
 
 // +k8s:deepcopy-gen=true
 
+// GrpcWeb holds the gRPC web middleware configuration.
+// This middleware converts a gRPC web request to an HTTP/2 gRPC request.
+type GrpcWeb struct {
+	// AllowOrigins is a list of allowable origins.
+	// Can also be a wildcard origin "*".
+	AllowOrigins []string `json:"allowOrigins,omitempty" toml:"allowOrigins,omitempty" yaml:"allowOrigins,omitempty"`
+}
+
+// +k8s:deepcopy-gen=true
+
 // ContentType holds the content-type middleware configuration.
 // This middleware exists to enable the correct behavior until at least the default one can be changed in a future version.
 type ContentType struct {

pkg/config/dynamic/zz_generated.deepcopy.go

@@ -353,6 +353,27 @@ func (in *ForwardingTimeouts) DeepCopy() *ForwardingTimeouts {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *GrpcWeb) DeepCopyInto(out *GrpcWeb) {
+	*out = *in
+	if in.AllowOrigins != nil {
+		in, out := &in.AllowOrigins, &out.AllowOrigins
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new GrpcWeb.
+func (in *GrpcWeb) DeepCopy() *GrpcWeb {
+	if in == nil {
+		return nil
+	}
+	out := new(GrpcWeb)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *HTTPConfiguration) DeepCopyInto(out *HTTPConfiguration) {
 	*out = *in
@@ -734,6 +755,11 @@ func (in *Middleware) DeepCopyInto(out *Middleware) {
 		*out = new(ContentType)
 		**out = **in
 	}
+	if in.GrpcWeb != nil {
+		in, out := &in.GrpcWeb, &out.GrpcWeb
+		*out = new(GrpcWeb)
+		(*in).DeepCopyInto(*out)
+	}
 	if in.Plugin != nil {
 		in, out := &in.Plugin, &out.Plugin
 		*out = make(map[string]PluginConf, len(*in))

pkg/middlewares/grpcweb/grpcweb.go

@@ -0,0 +1,27 @@
+package grpcweb
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/improbable-eng/grpc-web/go/grpcweb"
+	"github.com/traefik/traefik/v2/pkg/config/dynamic"
+	"github.com/traefik/traefik/v2/pkg/log"
+	"github.com/traefik/traefik/v2/pkg/middlewares"
+)
+
+const typeName = "grpc-web"
+
+// New builds a new gRPC web request converter.
+func New(ctx context.Context, next http.Handler, config dynamic.GrpcWeb, name string) http.Handler {
+	log.FromContext(middlewares.GetLoggerCtx(ctx, name, typeName)).Debug("Creating middleware")
+
+	return grpcweb.WrapHandler(next, grpcweb.WithCorsForRegisteredEndpointsOnly(false), grpcweb.WithOriginFunc(func(origin string) bool {
+		for _, originCfg := range config.AllowOrigins {
+			if originCfg == "*" || originCfg == origin {
+				return true
+			}
+		}
+		return false
+	}))
+}

pkg/provider/kubernetes/crd/kubernetes.go

@@ -279,6 +279,7 @@ func (p *Provider) loadConfigurationFromCRD(ctx context.Context, client Client)
 			PassTLSClientCert: middleware.Spec.PassTLSClientCert,
 			Retry:             retry,
 			ContentType:       middleware.Spec.ContentType,
+			GrpcWeb:           middleware.Spec.GrpcWeb,
 			Plugin:            plugin,
 		}
 	}

pkg/provider/kubernetes/crd/traefik/v1alpha1/middleware.go

@@ -48,6 +48,7 @@ type MiddlewareSpec struct {
 	PassTLSClientCert *dynamic.PassTLSClientCert `json:"passTLSClientCert,omitempty"`
 	Retry             *Retry                     `json:"retry,omitempty"`
 	ContentType       *dynamic.ContentType       `json:"contentType,omitempty"`
+	GrpcWeb           *dynamic.GrpcWeb           `json:"grpcWeb,omitempty"`
 	// Plugin defines the middleware plugin configuration.
 	// More info: https://doc.traefik.io/traefik/plugins/
 	Plugin map[string]apiextensionv1.JSON `json:"plugin,omitempty"`

pkg/provider/kubernetes/crd/traefik/v1alpha1/zz_generated.deepcopy.go

@@ -769,6 +769,11 @@ func (in *MiddlewareSpec) DeepCopyInto(out *MiddlewareSpec) {
 		*out = new(dynamic.ContentType)
 		**out = **in
 	}
+	if in.GrpcWeb != nil {
+		in, out := &in.GrpcWeb, &out.GrpcWeb
+		*out = new(dynamic.GrpcWeb)
+		(*in).DeepCopyInto(*out)
+	}
 	if in.Plugin != nil {
 		in, out := &in.Plugin, &out.Plugin
 		*out = make(map[string]v1.JSON, len(*in))

pkg/server/middleware/middlewares.go

@@ -17,6 +17,7 @@ import (
 	"github.com/traefik/traefik/v2/pkg/middlewares/circuitbreaker"
 	"github.com/traefik/traefik/v2/pkg/middlewares/compress"
 	"github.com/traefik/traefik/v2/pkg/middlewares/customerrors"
+	"github.com/traefik/traefik/v2/pkg/middlewares/grpcweb"
 	"github.com/traefik/traefik/v2/pkg/middlewares/headers"
 	"github.com/traefik/traefik/v2/pkg/middlewares/inflightreq"
 	"github.com/traefik/traefik/v2/pkg/middlewares/ipallowlist"
@@ -219,6 +220,16 @@ func (b *Builder) buildConstructor(ctx context.Context, middlewareName string) (
 		}
 	}
 
+	// GrpcWeb
+	if config.GrpcWeb != nil {
+		if middleware != nil {
+			return nil, badConf
+		}
+		middleware = func(next http.Handler) (http.Handler, error) {
+			return grpcweb.New(ctx, next, *config.GrpcWeb, middlewareName), nil
+		}
+	}
+
 	// Headers
 	if config.Headers != nil {
 		if middleware != nil {