Move to vendor

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/github.com/gorilla/handlers/compress.go

@@ -0,0 +1,84 @@
+// Copyright 2013 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package handlers
+
+import (
+	"compress/flate"
+	"compress/gzip"
+	"io"
+	"net/http"
+	"strings"
+)
+
+type compressResponseWriter struct {
+	io.Writer
+	http.ResponseWriter
+	http.Hijacker
+}
+
+func (w *compressResponseWriter) Header() http.Header {
+	return w.ResponseWriter.Header()
+}
+
+func (w *compressResponseWriter) Write(b []byte) (int, error) {
+	h := w.ResponseWriter.Header()
+	if h.Get("Content-Type") == "" {
+		h.Set("Content-Type", http.DetectContentType(b))
+	}
+
+	return w.Writer.Write(b)
+}
+
+// CompressHandler gzip compresses HTTP responses for clients that support it
+// via the 'Accept-Encoding' header.
+func CompressHandler(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	L:
+		for _, enc := range strings.Split(r.Header.Get("Accept-Encoding"), ",") {
+			switch strings.TrimSpace(enc) {
+			case "gzip":
+				w.Header().Set("Content-Encoding", "gzip")
+				w.Header().Add("Vary", "Accept-Encoding")
+
+				gw := gzip.NewWriter(w)
+				defer gw.Close()
+
+				h, hok := w.(http.Hijacker)
+				if !hok { /* w is not Hijacker... oh well... */
+					h = nil
+				}
+
+				w = &compressResponseWriter{
+					Writer:         gw,
+					ResponseWriter: w,
+					Hijacker:       h,
+				}
+
+				break L
+			case "deflate":
+				w.Header().Set("Content-Encoding", "deflate")
+				w.Header().Add("Vary", "Accept-Encoding")
+
+				fw, _ := flate.NewWriter(w, flate.DefaultCompression)
+				defer fw.Close()
+
+				h, hok := w.(http.Hijacker)
+				if !hok { /* w is not Hijacker... oh well... */
+					h = nil
+				}
+
+				w = &compressResponseWriter{
+					Writer:         fw,
+					ResponseWriter: w,
+					Hijacker:       h,
+				}
+
+				break L
+			}
+		}
+
+		h.ServeHTTP(w, r)
+	})
+}