gzip: Implement http.Hijacker (fixes #635)

middleware/gzip/gzip.go

@@ -3,10 +3,12 @@
 package gzip
 
 import (
+	"bufio"
 	"compress/gzip"
 	"fmt"
 	"io"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"strings"
 
@@ -130,3 +132,12 @@ func (w *gzipResponseWriter) Write(b []byte) (int, error) {
 	n, err := w.Writer.Write(b)
 	return n, err
 }
+
+// Hijack implements http.Hijacker. It simply wraps the underlying
+// ResponseWriter's Hijack method if there is one, or returns an error.
+func (w *gzipResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	if hj, ok := w.ResponseWriter.(http.Hijacker); ok {
+		return hj.Hijack()
+	}
+	return nil, nil, fmt.Errorf("not a Hijacker")
+}

middleware/recorder.go

@@ -62,11 +62,11 @@ func (r *ResponseRecorder) Status() int {
 	return r.status
 }
 
-// Hijacker is a wrapper of http.Hijacker underearth if any,
-// otherwise it just returns an error.
+// Hijack implements http.Hijacker. It simply wraps the underlying
+// ResponseWriter's Hijack method if there is one, or returns an error.
 func (r *ResponseRecorder) Hijack() (net.Conn, *bufio.ReadWriter, error) {
 	if hj, ok := r.ResponseWriter.(http.Hijacker); ok {
 		return hj.Hijack()
 	}
-	return nil, nil, errors.New("I'm not a Hijacker")
+	return nil, nil, errors.New("not a Hijacker")
 }