traefik/pkg/middlewares/compress/compress_test.go

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package compress
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import (
"compress/gzip"
"context"
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"io"
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"net/http"
"net/http/httptest"
"net/http/httptrace"
"net/textproto"
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"testing"
"github.com/klauspost/compress/gzhttp"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/testhelpers"
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)
const (
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contentEncodingHeader = "Content-Encoding"
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contentTypeHeader = "Content-Type"
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varyHeader = "Vary"
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)
func TestNegotiation(t *testing.T) {
testCases := []struct {
desc string
acceptEncHeader string
expEncoding string
}{
{
desc: "no accept header",
expEncoding: "",
},
{
desc: "unsupported accept header",
acceptEncHeader: "notreal",
expEncoding: "",
},
{
desc: "accept any header",
acceptEncHeader: "*",
expEncoding: brotliName,
},
{
desc: "gzip accept header",
acceptEncHeader: "gzip",
expEncoding: gzipName,
},
{
desc: "br accept header",
acceptEncHeader: "br",
expEncoding: brotliName,
},
{
desc: "multi accept header, prefer br",
acceptEncHeader: "br;q=0.8, gzip;q=0.6",
expEncoding: brotliName,
},
{
desc: "multi accept header, prefer gzip",
acceptEncHeader: "gzip;q=1.0, br;q=0.8",
expEncoding: gzipName,
},
{
desc: "multi accept header list, prefer br",
acceptEncHeader: "gzip, br",
expEncoding: brotliName,
},
{
desc: "zstd accept header",
acceptEncHeader: "zstd",
expEncoding: zstdName,
},
{
desc: "multi accept header, prefer zstd",
acceptEncHeader: "zstd;q=0.9, br;q=0.8, gzip;q=0.6",
expEncoding: zstdName,
},
{
desc: "multi accept header, prefer gzip",
acceptEncHeader: "gzip;q=1.0, br;q=0.8, zstd;q=0.7",
expEncoding: gzipName,
},
{
desc: "multi accept header list, prefer zstd",
acceptEncHeader: "gzip, br, zstd",
expEncoding: zstdName,
},
}
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
if test.acceptEncHeader != "" {
req.Header.Add(acceptEncodingHeader, test.acceptEncHeader)
}
next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
_, _ = rw.Write(generateBytes(10))
})
handler, err := New(context.Background(), next, dynamic.Compress{MinResponseBodyBytes: 1}, "testing")
require.NoError(t, err)
rw := httptest.NewRecorder()
handler.ServeHTTP(rw, req)
assert.Equal(t, test.expEncoding, rw.Header().Get(contentEncodingHeader))
})
}
}
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func TestShouldCompressWhenNoContentEncodingHeader(t *testing.T) {
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
req.Header.Add(acceptEncodingHeader, gzipName)
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baseBody := generateBytes(gzhttp.DefaultMinSize)
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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_, err := rw.Write(baseBody)
assert.NoError(t, err)
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})
handler, err := New(context.Background(), next, dynamic.Compress{}, "testing")
require.NoError(t, err)
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rw := httptest.NewRecorder()
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handler.ServeHTTP(rw, req)
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assert.Equal(t, gzipName, rw.Header().Get(contentEncodingHeader))
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assert.Equal(t, acceptEncodingHeader, rw.Header().Get(varyHeader))
gr, err := gzip.NewReader(rw.Body)
require.NoError(t, err)
got, err := io.ReadAll(gr)
require.NoError(t, err)
assert.Equal(t, got, baseBody)
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}
func TestShouldNotCompressWhenContentEncodingHeader(t *testing.T) {
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
req.Header.Add(acceptEncodingHeader, gzipName)
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fakeCompressedBody := generateBytes(gzhttp.DefaultMinSize)
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
rw.Header().Add(contentEncodingHeader, gzipName)
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rw.Header().Add(varyHeader, acceptEncodingHeader)
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_, err := rw.Write(fakeCompressedBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler, err := New(context.Background(), next, dynamic.Compress{}, "testing")
require.NoError(t, err)
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rw := httptest.NewRecorder()
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handler.ServeHTTP(rw, req)
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assert.Equal(t, gzipName, rw.Header().Get(contentEncodingHeader))
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assert.Equal(t, acceptEncodingHeader, rw.Header().Get(varyHeader))
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assert.EqualValues(t, rw.Body.Bytes(), fakeCompressedBody)
}
func TestShouldNotCompressWhenNoAcceptEncodingHeader(t *testing.T) {
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req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
fakeBody := generateBytes(gzhttp.DefaultMinSize)
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler, err := New(context.Background(), next, dynamic.Compress{}, "testing")
require.NoError(t, err)
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rw := httptest.NewRecorder()
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handler.ServeHTTP(rw, req)
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assert.Empty(t, rw.Header().Get(contentEncodingHeader))
assert.Empty(t, rw.Header().Get(varyHeader))
assert.EqualValues(t, rw.Body.Bytes(), fakeBody)
}
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func TestShouldNotCompressWhenIdentityAcceptEncodingHeader(t *testing.T) {
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
req.Header.Set(acceptEncodingHeader, "identity")
fakeBody := generateBytes(gzhttp.DefaultMinSize)
next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if r.Header.Get(acceptEncodingHeader) != "identity" {
http.Error(rw, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler, err := New(context.Background(), next, dynamic.Compress{}, "testing")
require.NoError(t, err)
rw := httptest.NewRecorder()
handler.ServeHTTP(rw, req)
assert.Empty(t, rw.Header().Get(contentEncodingHeader))
assert.Empty(t, rw.Header().Get(varyHeader))
assert.EqualValues(t, rw.Body.Bytes(), fakeBody)
}
func TestShouldNotCompressWhenEmptyAcceptEncodingHeader(t *testing.T) {
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
req.Header.Set(acceptEncodingHeader, "")
fakeBody := generateBytes(gzhttp.DefaultMinSize)
next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if r.Header.Get(acceptEncodingHeader) != "" {
http.Error(rw, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler, err := New(context.Background(), next, dynamic.Compress{}, "testing")
require.NoError(t, err)
rw := httptest.NewRecorder()
handler.ServeHTTP(rw, req)
assert.Empty(t, rw.Header().Get(contentEncodingHeader))
assert.Empty(t, rw.Header().Get(varyHeader))
assert.EqualValues(t, rw.Body.Bytes(), fakeBody)
}
func TestShouldNotCompressHeadRequest(t *testing.T) {
req := testhelpers.MustNewRequest(http.MethodHead, "http://localhost", nil)
req.Header.Add(acceptEncodingHeader, gzipName)
fakeBody := generateBytes(gzhttp.DefaultMinSize)
next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler, err := New(context.Background(), next, dynamic.Compress{}, "testing")
require.NoError(t, err)
rw := httptest.NewRecorder()
handler.ServeHTTP(rw, req)
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assert.Empty(t, rw.Header().Get(contentEncodingHeader))
assert.Empty(t, rw.Header().Get(varyHeader))
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assert.EqualValues(t, rw.Body.Bytes(), fakeBody)
}
func TestShouldNotCompressWhenSpecificContentType(t *testing.T) {
baseBody := generateBytes(gzhttp.DefaultMinSize)
testCases := []struct {
desc string
conf dynamic.Compress
reqContentType string
respContentType string
}{
{
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: "Include Response Content-Type",
conf: dynamic.Compress{
IncludedContentTypes: []string{"text/plain"},
},
respContentType: "text/html",
},
{
desc: "Ignoring application/grpc with exclude option",
conf: dynamic.Compress{
ExcludedContentTypes: []string{"application/json"},
},
reqContentType: "application/grpc",
},
{
desc: "Ignoring application/grpc with include option",
conf: dynamic.Compress{
IncludedContentTypes: []string{"application/json"},
},
reqContentType: "application/grpc",
},
{
desc: "Ignoring application/grpc with no option",
conf: dynamic.Compress{},
reqContentType: "application/grpc",
},
}
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for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
req.Header.Add(acceptEncodingHeader, gzipName)
if test.reqContentType != "" {
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)
rw := httptest.NewRecorder()
handler.ServeHTTP(rw, req)
assert.Empty(t, rw.Header().Get(acceptEncodingHeader))
assert.Empty(t, rw.Header().Get(contentEncodingHeader))
assert.EqualValues(t, rw.Body.Bytes(), baseBody)
})
}
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}
func TestShouldCompressWhenSpecificContentType(t *testing.T) {
baseBody := generateBytes(gzhttp.DefaultMinSize)
testCases := []struct {
desc string
conf dynamic.Compress
respContentType string
}{
{
desc: "Include Response Content-Type",
conf: dynamic.Compress{
IncludedContentTypes: []string{"text/html"},
},
respContentType: "text/html",
},
}
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
req.Header.Add(acceptEncodingHeader, gzipName)
next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
rw.Header().Set(contentTypeHeader, test.respContentType)
if _, err := rw.Write(baseBody); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler, err := New(context.Background(), next, test.conf, "test")
require.NoError(t, err)
rw := httptest.NewRecorder()
handler.ServeHTTP(rw, req)
assert.Equal(t, gzipName, rw.Header().Get(contentEncodingHeader))
assert.Equal(t, acceptEncodingHeader, rw.Header().Get(varyHeader))
assert.NotEqualValues(t, rw.Body.Bytes(), baseBody)
})
}
}
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func TestIntegrationShouldNotCompress(t *testing.T) {
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fakeCompressedBody := generateBytes(100000)
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testCases := []struct {
name string
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handler http.Handler
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expectedStatusCode int
}{
{
name: "when content already compressed",
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handler: http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
rw.Header().Add(contentEncodingHeader, gzipName)
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rw.Header().Add(varyHeader, acceptEncodingHeader)
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_, err := rw.Write(fakeCompressedBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
}),
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expectedStatusCode: http.StatusOK,
},
{
name: "when content already compressed and status code Created",
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handler: http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
rw.Header().Add(contentEncodingHeader, gzipName)
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rw.Header().Add(varyHeader, acceptEncodingHeader)
rw.WriteHeader(http.StatusCreated)
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_, err := rw.Write(fakeCompressedBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
}),
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expectedStatusCode: http.StatusCreated,
},
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}
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for _, test := range testCases {
t.Run(test.name, func(t *testing.T) {
compress, err := New(context.Background(), test.handler, dynamic.Compress{}, "testing")
require.NoError(t, err)
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ts := httptest.NewServer(compress)
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defer ts.Close()
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req := testhelpers.MustNewRequest(http.MethodGet, ts.URL, nil)
req.Header.Add(acceptEncodingHeader, gzipName)
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resp, err := http.DefaultClient.Do(req)
require.NoError(t, err)
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assert.Equal(t, test.expectedStatusCode, resp.StatusCode)
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assert.Equal(t, gzipName, resp.Header.Get(contentEncodingHeader))
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assert.Equal(t, acceptEncodingHeader, resp.Header.Get(varyHeader))
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body, err := io.ReadAll(resp.Body)
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require.NoError(t, err)
assert.EqualValues(t, fakeCompressedBody, body)
})
}
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}
func TestShouldWriteHeaderWhenFlush(t *testing.T) {
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
rw.Header().Add(contentEncodingHeader, gzipName)
rw.Header().Add(varyHeader, acceptEncodingHeader)
rw.WriteHeader(http.StatusUnauthorized)
rw.(http.Flusher).Flush()
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_, err := rw.Write([]byte("short"))
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler, err := New(context.Background(), next, dynamic.Compress{}, "testing")
require.NoError(t, err)
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ts := httptest.NewServer(handler)
defer ts.Close()
req := testhelpers.MustNewRequest(http.MethodGet, ts.URL, nil)
req.Header.Add(acceptEncodingHeader, gzipName)
resp, err := http.DefaultClient.Do(req)
require.NoError(t, err)
assert.Equal(t, http.StatusUnauthorized, resp.StatusCode)
assert.Equal(t, gzipName, resp.Header.Get(contentEncodingHeader))
assert.Equal(t, acceptEncodingHeader, resp.Header.Get(varyHeader))
}
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func TestIntegrationShouldCompress(t *testing.T) {
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fakeBody := generateBytes(100000)
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testCases := []struct {
name string
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handler http.Handler
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expectedStatusCode int
}{
{
name: "when AcceptEncoding header is present",
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handler: http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
}),
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expectedStatusCode: http.StatusOK,
},
{
name: "when AcceptEncoding header is present and status code Created",
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handler: http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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rw.WriteHeader(http.StatusCreated)
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_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
}),
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expectedStatusCode: http.StatusCreated,
},
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}
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for _, test := range testCases {
t.Run(test.name, func(t *testing.T) {
compress, err := New(context.Background(), test.handler, dynamic.Compress{}, "testing")
require.NoError(t, err)
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ts := httptest.NewServer(compress)
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defer ts.Close()
req := testhelpers.MustNewRequest(http.MethodGet, ts.URL, nil)
req.Header.Add(acceptEncodingHeader, gzipName)
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resp, err := http.DefaultClient.Do(req)
require.NoError(t, err)
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assert.Equal(t, test.expectedStatusCode, resp.StatusCode)
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assert.Equal(t, gzipName, resp.Header.Get(contentEncodingHeader))
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assert.Equal(t, acceptEncodingHeader, resp.Header.Get(varyHeader))
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body, err := io.ReadAll(resp.Body)
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require.NoError(t, err)
if assert.ObjectsAreEqualValues(body, fakeBody) {
assert.Fail(t, "expected a compressed body", "got %v", body)
}
})
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}
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}
func TestMinResponseBodyBytes(t *testing.T) {
fakeBody := generateBytes(100000)
testCases := []struct {
name string
minResponseBodyBytes int
expectedCompression bool
}{
{
name: "should compress",
expectedCompression: true,
},
{
name: "should not compress",
minResponseBodyBytes: 100001,
},
}
for _, test := range testCases {
t.Run(test.name, func(t *testing.T) {
t.Parallel()
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
req.Header.Add(acceptEncodingHeader, gzipName)
next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if _, err := rw.Write(fakeBody); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler, err := New(context.Background(), next, dynamic.Compress{MinResponseBodyBytes: test.minResponseBodyBytes}, "testing")
require.NoError(t, err)
rw := httptest.NewRecorder()
handler.ServeHTTP(rw, req)
if test.expectedCompression {
assert.Equal(t, gzipName, rw.Header().Get(contentEncodingHeader))
assert.NotEqualValues(t, rw.Body.Bytes(), fakeBody)
return
}
assert.Empty(t, rw.Header().Get(contentEncodingHeader))
assert.EqualValues(t, rw.Body.Bytes(), fakeBody)
})
}
}
// This test is an adapted version of net/http/httputil.Test1xxResponses test.
func Test1xxResponses(t *testing.T) {
fakeBody := generateBytes(100000)
next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
h := w.Header()
h.Add("Link", "</style.css>; rel=preload; as=style")
h.Add("Link", "</script.js>; rel=preload; as=script")
w.WriteHeader(http.StatusEarlyHints)
h.Add("Link", "</foo.js>; rel=preload; as=script")
w.WriteHeader(http.StatusProcessing)
if _, err := w.Write(fakeBody); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
})
compress, err := New(context.Background(), next, dynamic.Compress{MinResponseBodyBytes: 1024}, "testing")
require.NoError(t, err)
server := httptest.NewServer(compress)
t.Cleanup(server.Close)
frontendClient := server.Client()
checkLinkHeaders := func(t *testing.T, expected, got []string) {
t.Helper()
if len(expected) != len(got) {
t.Errorf("Expected %d link headers; got %d", len(expected), len(got))
}
for i := range expected {
if i >= len(got) {
t.Errorf("Expected %q link header; got nothing", expected[i])
continue
}
if expected[i] != got[i] {
t.Errorf("Expected %q link header; got %q", expected[i], got[i])
}
}
}
var respCounter uint8
trace := &httptrace.ClientTrace{
Got1xxResponse: func(code int, header textproto.MIMEHeader) error {
switch code {
case http.StatusEarlyHints:
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script"}, header["Link"])
case http.StatusProcessing:
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, header["Link"])
default:
t.Error("Unexpected 1xx response")
}
respCounter++
return nil
},
}
req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, server.URL, nil)
req.Header.Add(acceptEncodingHeader, gzipName)
res, err := frontendClient.Do(req)
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assert.NoError(t, err)
defer res.Body.Close()
if respCounter != 2 {
t.Errorf("Expected 2 1xx responses; got %d", respCounter)
}
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, res.Header["Link"])
assert.Equal(t, gzipName, res.Header.Get(contentEncodingHeader))
body, _ := io.ReadAll(res.Body)
assert.NotEqualValues(t, body, fakeBody)
}
func BenchmarkCompress(b *testing.B) {
testCases := []struct {
name string
parallel bool
size int
}{
{
name: "2k",
size: 2048,
},
{
name: "20k",
size: 20480,
},
{
name: "100k",
size: 102400,
},
{
name: "2k parallel",
parallel: true,
size: 2048,
},
{
name: "20k parallel",
parallel: true,
size: 20480,
},
{
name: "100k parallel",
parallel: true,
size: 102400,
},
}
for _, test := range testCases {
b.Run(test.name, func(b *testing.B) {
baseBody := generateBytes(test.size)
next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
_, err := rw.Write(baseBody)
assert.NoError(b, err)
})
handler, _ := New(context.Background(), next, dynamic.Compress{}, "testing")
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req, _ := http.NewRequest(http.MethodGet, "/whatever", nil)
req.Header.Set("Accept-Encoding", "gzip")
b.ReportAllocs()
b.SetBytes(int64(test.size))
if test.parallel {
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
runBenchmark(b, req, handler)
}
})
return
}
b.ResetTimer()
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for range b.N {
runBenchmark(b, req, handler)
}
})
}
}
func runBenchmark(b *testing.B, req *http.Request, handler http.Handler) {
b.Helper()
res := httptest.NewRecorder()
handler.ServeHTTP(res, req)
if code := res.Code; code != 200 {
b.Fatalf("Expected 200 but got %d", code)
}
assert.Equal(b, gzipName, res.Header().Get(contentEncodingHeader))
}
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func generateBytes(length int) []byte {
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var value []byte
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for i := range length {
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value = append(value, 0x61+byte(i))
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}
return value
}