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gzip: Avoid duplicated Vary header (#2939)

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This commit is contained in:
Dozer 2020-01-13 05:00:18 +08:00 committed by Matt Holt
parent 4b68de8418
commit cd66b62083
1 changed files with 13 additions and 1 deletions
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14
caddyhttp/gzip/gzip.go
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@ -130,7 +130,19 @@ type gzipResponseWriter struct {
func (w *gzipResponseWriter) WriteHeader(code int) {
w.Header().Del("Content-Length")
w.Header().Set("Content-Encoding", "gzip")
w.Header().Add("Vary", "Accept-Encoding")
varyList, exist := w.Header()["Vary"]
shouldAddVary := true
if exist {
for _, vary := range varyList {
if vary == "Accept-Encoding" {
shouldAddVary = false
break
}
}
}
if shouldAddVary {
w.Header().Add("Vary", "Accept-Encoding")
}
originalEtag := w.Header().Get("ETag")
if originalEtag != "" && !strings.HasPrefix(originalEtag, "W/") {
w.Header().Set("ETag", "W/"+originalEtag)