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-rw-r--r--modules/caddyhttp/encode/encode.go20
-rw-r--r--modules/caddyhttp/encode/encode_test.go47
2 files changed, 60 insertions, 7 deletions
diff --git a/modules/caddyhttp/encode/encode.go b/modules/caddyhttp/encode/encode.go
index 91e7060..e3a6267 100644
--- a/modules/caddyhttp/encode/encode.go
+++ b/modules/caddyhttp/encode/encode.go
@@ -117,14 +117,20 @@ func (enc *Encode) Validate() error {
return nil
}
+func isEncodeAllowed(h http.Header) bool {
+ return !strings.Contains(h.Get("Cache-Control"), "no-transform")
+}
+
func (enc *Encode) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
- for _, encName := range AcceptedEncodings(r, enc.Prefer) {
- if _, ok := enc.writerPools[encName]; !ok {
- continue // encoding not offered
+ if isEncodeAllowed(r.Header) {
+ for _, encName := range AcceptedEncodings(r, enc.Prefer) {
+ if _, ok := enc.writerPools[encName]; !ok {
+ continue // encoding not offered
+ }
+ w = enc.openResponseWriter(encName, w)
+ defer w.(*responseWriter).Close()
+ break
}
- w = enc.openResponseWriter(encName, w)
- defer w.(*responseWriter).Close()
- break
}
return next.ServeHTTP(w, r)
}
@@ -281,7 +287,7 @@ func (rw *responseWriter) Close() error {
// init should be called before we write a response, if rw.buf has contents.
func (rw *responseWriter) init() {
- if rw.Header().Get("Content-Encoding") == "" &&
+ if rw.Header().Get("Content-Encoding") == "" && isEncodeAllowed(rw.Header()) &&
rw.config.Match(rw) {
rw.w = rw.config.writerPools[rw.encodingName].Get().(Encoder)
diff --git a/modules/caddyhttp/encode/encode_test.go b/modules/caddyhttp/encode/encode_test.go
index 5f1e3f2..3374ee3 100644
--- a/modules/caddyhttp/encode/encode_test.go
+++ b/modules/caddyhttp/encode/encode_test.go
@@ -261,3 +261,50 @@ func TestValidate(t *testing.T) {
}
}
+
+func TestIsEncodeAllowed(t *testing.T) {
+ testCases := []struct {
+ name string
+ headers http.Header
+ expected bool
+ }{
+ {
+ name: "Without any headers",
+ headers: http.Header{},
+ expected: true,
+ },
+ {
+ name: "Without Cache-Control HTTP header",
+ headers: http.Header{
+ "Accept-Encoding": {"gzip"},
+ },
+ expected: true,
+ },
+ {
+ name: "Cache-Control HTTP header ending with no-transform directive",
+ headers: http.Header{
+ "Accept-Encoding": {"gzip"},
+ "Cache-Control": {"no-cache; no-transform"},
+ },
+ expected: false,
+ },
+ {
+ name: "With Cache-Control HTTP header no-transform as Cache-Extension value",
+ headers: http.Header{
+ "Accept-Encoding": {"gzip"},
+ "Cache-Control": {`no-store; no-cache; community="no-transform"`},
+ },
+ expected: false,
+ },
+ }
+
+ for _, test := range testCases {
+ t.Run(test.name, func(t *testing.T) {
+ if result := isEncodeAllowed(test.headers); result != test.expected {
+ t.Errorf("The headers given to the isEncodeAllowed should return %t, %t given.",
+ result,
+ test.expected)
+ }
+ })
+ }
+}