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// Copyright 2015 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package header
import (
"net/http"
"strings"
"github.com/google/martian/v3"
)
// Hop-by-hop headers as defined by RFC2616.
//
// http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-14#section-7.1.3.1
var hopByHopHeaders = []string{
"Connection",
"Keep-Alive",
"Proxy-Authenticate",
"Proxy-Authorization",
"Proxy-Connection", // Non-standard, but required for HTTP/2.
"Te",
"Trailer",
"Transfer-Encoding",
"Upgrade",
}
type hopByHopModifier struct{}
// NewHopByHopModifier removes Hop-By-Hop headers from requests and
// responses.
func NewHopByHopModifier() martian.RequestResponseModifier {
return &hopByHopModifier{}
}
// ModifyRequest removes all hop-by-hop headers defined by RFC2616 as
// well as any additional hop-by-hop headers specified in the
// Connection header.
func (m *hopByHopModifier) ModifyRequest(req *http.Request) error {
removeHopByHopHeaders(req.Header)
return nil
}
// ModifyResponse removes all hop-by-hop headers defined by RFC2616 as
// well as any additional hop-by-hop headers specified in the
// Connection header.
func (m *hopByHopModifier) ModifyResponse(res *http.Response) error {
removeHopByHopHeaders(res.Header)
return nil
}
func removeHopByHopHeaders(header http.Header) {
// Additional hop-by-hop headers may be specified in `Connection` headers.
// http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-14#section-9.1
for _, vs := range header["Connection"] {
for _, v := range strings.Split(vs, ",") {
k := http.CanonicalHeaderKey(strings.TrimSpace(v))
header.Del(k)
}
}
for _, k := range hopByHopHeaders {
header.Del(k)
}
}
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