| // Copyright 2018 Google LLC |
| // |
| // 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 proxy |
| |
| import ( |
| "log" |
| "net/http" |
| ) |
| |
| // Useful things for when we need to figure out what's actually going on under the hood. |
| |
| type debugTransport struct { |
| prefix string |
| t *http.Transport |
| } |
| |
| func (d debugTransport) RoundTrip(req *http.Request) (*http.Response, error) { |
| log.Printf("proxy %s: %s %s", d.prefix, req.Method, req.URL) |
| logHeaders(req.Header) |
| res, err := d.t.RoundTrip(req) |
| if err != nil { |
| log.Printf("proxy %s: error %v", d.prefix, err) |
| } else { |
| log.Printf("proxy %s: %s", d.prefix, res.Status) |
| log.Printf("Uncompressed = %v", res.Uncompressed) |
| log.Printf("ContentLength = %d", res.ContentLength) |
| logHeaders(res.Header) |
| log.Printf("Trailers:") |
| logHeaders(res.Trailer) |
| } |
| return res, err |
| } |
| |
| func logHeaders(hs http.Header) { |
| for k, v := range hs { |
| log.Printf(" %s: %s", k, v) |
| } |
| } |