-
Notifications
You must be signed in to change notification settings - Fork 785
/
gzip_handler.go
41 lines (35 loc) · 1.01 KB
/
gzip_handler.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
package http
import (
"compress/gzip"
"io"
"net/http"
"strings"
)
//------------------------------------------------------------------------------
type gzipResponseWriter struct {
io.Writer
http.ResponseWriter
}
func (w gzipResponseWriter) Write(b []byte) (int, error) {
if "" == w.Header().Get("Content-Type") {
// If no content type, apply sniffing algorithm to un-gzipped body.
w.Header().Set("Content-Type", http.DetectContentType(b))
}
return w.Writer.Write(b)
}
// GzipHandler wraps a handlerfunc with a handler that automatically Gzips
// outbound messages.
func GzipHandler(fn http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
fn(w, r)
return
}
w.Header().Set("Content-Encoding", "gzip")
gz := gzip.NewWriter(w)
defer gz.Close()
gzr := gzipResponseWriter{Writer: gz, ResponseWriter: w}
fn(gzr, r)
}
}
//------------------------------------------------------------------------------