Use github.com/NYTimes/gziphandler

Gopkg.toml

@@ -42,3 +42,7 @@
 [[constraint]]
   name = "github.com/cenkalti/backoff"
   version = "v1.1.0"
+
+[[constraint]]
+  name = "github.com/NYTimes/gziphandler"
+  version = "1.0.1"

src/gui/http.go

@@ -11,6 +11,7 @@ import (
 	"time"
 	"unicode"
 
+	"github.com/NYTimes/gziphandler"
 	"github.com/skycoin/skycoin/src/api/webrpc"
 	"github.com/skycoin/skycoin/src/cipher"
 	"github.com/skycoin/skycoin/src/daemon"
@@ -199,7 +200,7 @@ func newServerMux(c muxConfig, gateway Gatewayer, csrfStore *CSRFStore, rpc *web
 		handler = wh.ElapsedHandler(logger, handler)
 		handler = CSRFCheck(csrfStore, handler)
 		handler = headerCheck(c.host, handler)
-		handler = wh.GzipHandler(handler)
+		handler = gziphandler.GzipHandler(handler)
 		mux.Handle(endpoint, handler)
 	}
 

src/util/http/handler.go

@@ -1,9 +1,7 @@
 package httphelper
 
 import (
-	"compress/gzip"
 	"fmt"
-	"io"
 	"net/http"
 	"strings"
 
@@ -48,29 +46,3 @@ func HostCheck(logger *logging.Logger, host string, handler http.Handler) http.H
 		handler.ServeHTTP(w, r)
 	})
 }
-
-type gzipResponseWriter struct {
-	io.Writer
-	http.ResponseWriter
-}
-
-func (grw gzipResponseWriter) Write(b []byte) (int, error) {
-	return grw.Writer.Write(b)
-}
-
-// GzipHandler compresses response with gzip if request's header of 'Accept-Encoding' contains 'gzip'.
-func GzipHandler(handler http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
-			handler.ServeHTTP(w, r)
-			return
-		}
-
-		w.Header().Set("Content-Encoding", "gzip")
-		gz := gzip.NewWriter(w)
-		defer gz.Close()
-
-		gzr := gzipResponseWriter{Writer: gz, ResponseWriter: w}
-		handler.ServeHTTP(gzr, r)
-	})
-}