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41 lines
963 B
Go
41 lines
963 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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func Gzip(p parser) Middleware {
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return func(next http.HandlerFunc) http.HandlerFunc {
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return 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(w, r)
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return
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}
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w.Header().Set("Content-Encoding", "gzip")
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gzipWriter := gzip.NewWriter(w)
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defer gzipWriter.Close()
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gz := gzipResponseWriter{Writer: gzipWriter, ResponseWriter: w}
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next(gz, r)
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}
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}
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}
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// gzipResponeWriter wraps the underlying Write method
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// with a gzip.Writer to compress the output.
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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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// Write wraps the underlying Write method to do compression.
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func (w gzipResponseWriter) Write(b []byte) (int, error) {
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if w.Header().Get("Content-Type") == "" {
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w.Header().Set("Content-Type", http.DetectContentType(b))
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}
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n, err := w.Writer.Write(b)
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return n, err
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}
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