Apply content type exclusion on response

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

docs/content/middlewares/compress.md

@@ -71,9 +71,9 @@ http:
 
 ### `excludedContentTypes`
 
-`excludedContentTypes` specifies a list of content types to compare the `Content-Type` header of the incoming requests to before compressing.
+`excludedContentTypes` specifies a list of content types to compare the `Content-Type` header of the incoming requests and responses before compressing.
 
-The requests with content types defined in `excludedContentTypes` are not compressed.
+The responses with content types defined in `excludedContentTypes` are not compressed.
 
 Content types are compared in a case-insensitive, whitespace-ignored manner.
 

go.mod

@@ -8,7 +8,6 @@ require (
 	github.com/Masterminds/semver v1.4.2 // indirect
 	github.com/Masterminds/sprig v2.22.0+incompatible
 	github.com/Microsoft/hcsshim v0.8.7 // indirect
-	github.com/NYTimes/gziphandler v1.1.1
 	github.com/Shopify/sarama v1.23.1 // indirect
 	github.com/abbot/go-http-auth v0.0.0-00010101000000-000000000000
 	github.com/abronan/valkeyrie v0.0.0-20200127174252-ef4277a138cd
@@ -68,9 +67,10 @@ require (
 	github.com/prometheus/client_model v0.2.0
 	github.com/rancher/go-rancher-metadata v0.0.0-20200311180630-7f4c936a06ac
 	github.com/sirupsen/logrus v1.7.0
-	github.com/stretchr/testify v1.6.1
+	github.com/stretchr/testify v1.7.0
 	github.com/stvp/go-udp-testing v0.0.0-20191102171040-06b61409b154
 	github.com/tinylib/msgp v1.0.2 // indirect
+	github.com/traefik/gziphandler v1.1.2-0.20210212101304-175e0fad6888
 	github.com/traefik/paerser v0.1.1
 	github.com/traefik/yaegi v0.9.8
 	github.com/uber/jaeger-client-go v2.25.0+incompatible

go.sum

@@ -89,8 +89,6 @@ github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tT
 github.com/Microsoft/hcsshim v0.8.7 h1:ptnOoufxGSzauVTsdE+wMYnCWA301PdoN4xg5oRdZpg=
 github.com/Microsoft/hcsshim v0.8.7/go.mod h1:OHd7sQqRFrYd3RmSgbgji+ctCwkbq2wbEYNSzOYtcBQ=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/NYTimes/gziphandler v1.1.1 h1:ZUDjpQae29j0ryrS0u/B8HZfJBtBQHjqw2rQ2cqUQ3I=
-github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/OpenDNS/vegadns2client v0.0.0-20180418235048-a3fa4a771d87 h1:xPMsUicZ3iosVPSIP7bW5EcGUzjiiMl1OYTe14y/R24=
 github.com/OpenDNS/vegadns2client v0.0.0-20180418235048-a3fa4a771d87/go.mod h1:iGLljf5n9GjT6kc0HBvyI1nOKnGQbNB66VzSNbK5iks=
@@ -868,6 +866,8 @@ github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81P
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stvp/go-udp-testing v0.0.0-20191102171040-06b61409b154 h1:XGopsea1Dw7ecQ8JscCNQXDGYAKDiWjDeXnpN/+BY9g=
 github.com/stvp/go-udp-testing v0.0.0-20191102171040-06b61409b154/go.mod h1:7jxmlfBCDBXRzr0eAQJ48XC1hBu1np4CS5+cHEYfwpc=
 github.com/syndtr/gocapability v0.0.0-20170704070218-db04d3cc01c8/go.mod h1:hkRG7XYTFWNJGYcbNJQlaLq0fg1yr4J4t/NcTQtrfww=
@@ -877,6 +877,8 @@ github.com/tinylib/msgp v1.0.2/go.mod h1:+d+yLhGm8mzTaHzB+wgMYrodPfmZrzkirds8fDW
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 h1:LnC5Kc/wtumK+WB441p7ynQJzVuNRJiqddSIE3IlSEQ=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
+github.com/traefik/gziphandler v1.1.2-0.20210212101304-175e0fad6888 h1:GMY0C+M/w8xO+/NP3Kq6sroMd+z2KbbdVr1K8o2NLHk=
+github.com/traefik/gziphandler v1.1.2-0.20210212101304-175e0fad6888/go.mod h1:sLqwoN03tkluITKL+lPEZbfsJQU2suYoKbrR/HeV9aM=
 github.com/traefik/paerser v0.1.1 h1:Suj0iA4hTAV6E4Dh5/++TXAj5u6iTwydBlFssIUz+9w=
 github.com/traefik/paerser v0.1.1/go.mod h1:yYnAgdEC2wJH5CgG75qGWC8SsFDEapg09o9RrA6FfrE=
 github.com/traefik/yaegi v0.9.8 h1:sYGKV2d911B9olVsSO/nRmjIh+CQTffAUSzoyv4a4/4=

pkg/middlewares/compress/compress.go

@@ -6,8 +6,8 @@ import (
 	"mime"
 	"net/http"
 
-	"github.com/NYTimes/gziphandler"
 	"github.com/opentracing/opentracing-go/ext"
+	"github.com/traefik/gziphandler"
 	"github.com/traefik/traefik/v2/pkg/config/dynamic"
 	"github.com/traefik/traefik/v2/pkg/log"
 	"github.com/traefik/traefik/v2/pkg/middlewares"
@@ -52,7 +52,7 @@ func (c *compress) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 		c.next.ServeHTTP(rw, req)
 	} else {
 		ctx := middlewares.GetLoggerCtx(req.Context(), c.name, typeName)
-		gzipHandler(ctx, c.next).ServeHTTP(rw, req)
+		c.gzipHandler(ctx).ServeHTTP(rw, req)
 	}
 }
 
@@ -60,15 +60,16 @@ func (c *compress) GetTracingInformation() (string, ext.SpanKindEnum) {
 	return c.name, tracing.SpanKindNoneEnum
 }
 
-func gzipHandler(ctx context.Context, h http.Handler) http.Handler {
+func (c *compress) gzipHandler(ctx context.Context) http.Handler {
 	wrapper, err := gziphandler.GzipHandlerWithOpts(
+		gziphandler.ContentTypeExceptions(c.excludes),
 		gziphandler.CompressionLevel(gzip.DefaultCompression),
 		gziphandler.MinSize(gziphandler.DefaultMinSize))
 	if err != nil {
 		log.FromContext(ctx).Error(err)
 	}
 
-	return wrapper(h)
+	return wrapper(c.next)
 }
 
 func contains(values []string, val string) bool {

pkg/middlewares/compress/compress_test.go

@@ -7,9 +7,9 @@ import (
 	"net/http/httptest"
 	"testing"
 
-	"github.com/NYTimes/gziphandler"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"github.com/traefik/gziphandler"
 	"github.com/traefik/traefik/v2/pkg/config/dynamic"
 	"github.com/traefik/traefik/v2/pkg/testhelpers"
 )
@@ -91,25 +91,26 @@ func TestShouldNotCompressWhenNoAcceptEncodingHeader(t *testing.T) {
 func TestShouldNotCompressWhenSpecificContentType(t *testing.T) {
 	baseBody := generateBytes(gziphandler.DefaultMinSize)
 
-	next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
-		_, err := rw.Write(baseBody)
-		if err != nil {
-			http.Error(rw, err.Error(), http.StatusInternalServerError)
-		}
-	})
-
 	testCases := []struct {
 		desc            string
 		conf            dynamic.Compress
 		reqContentType  string
+		respContentType string
 	}{
 		{
-			desc: "text/event-stream",
+			desc: "Exclude Request Content-Type",
 			conf: dynamic.Compress{
 				ExcludedContentTypes: []string{"text/event-stream"},
 			},
 			reqContentType: "text/event-stream",
 		},
+		{
+			desc: "Exclude Response Content-Type",
+			conf: dynamic.Compress{
+				ExcludedContentTypes: []string{"text/event-stream"},
+			},
+			respContentType: "text/event-stream",
+		},
 		{
 			desc:           "application/grpc",
 			conf:           dynamic.Compress{},
@@ -128,6 +129,17 @@ func TestShouldNotCompressWhenSpecificContentType(t *testing.T) {
 				req.Header.Add(contentTypeHeader, test.reqContentType)
 			}
 
+			next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+				if len(test.respContentType) > 0 {
+					rw.Header().Set(contentTypeHeader, test.respContentType)
+				}
+
+				_, err := rw.Write(baseBody)
+				if err != nil {
+					http.Error(rw, err.Error(), http.StatusInternalServerError)
+				}
+			})
+
 			handler, err := New(context.Background(), next, test.conf, "test")
 			require.NoError(t, err)