36 lines
762 B
Go
36 lines
762 B
Go
package middleware
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import (
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"compress/gzip"
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"io"
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"net/http"
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"strings"
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)
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// Gzip wraps HTTP responses with gzip compression when supported by the client.
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func Gzip(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
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next.ServeHTTP(w, r)
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return
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}
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gz := gzip.NewWriter(w)
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defer gz.Close()
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w.Header().Set("Content-Encoding", "gzip")
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w.Header().Add("Vary", "Accept-Encoding")
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gzr := gzipResponseWriter{Writer: gz, ResponseWriter: w}
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next.ServeHTTP(gzr, r)
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})
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}
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type gzipResponseWriter struct {
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io.Writer
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http.ResponseWriter
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}
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func (w gzipResponseWriter) Write(b []byte) (int, error) {
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return w.Writer.Write(b)
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}
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