httptee

Tee http diff server for comparing how backends respond to requests.

httptee will respond to all requests by proxying them to the base backend. The requests are also sent to the compare backend to be diffed.

Usage

$ go install github.com/xthexder/httptee

$ httptee --help
Usage of httptee:
  -addr=":8080": TCP address to bind
  -base=":8081": main upstream host to proxy
  -compare=":8082": secondary upstream host to proxy
  -verbose=false: verbose logging

Example

Server:

$ httptee -base="cache01.nyc.frustra.org:80" -compare="cache01.sfo.frustra.org:80"
INFO[0000] Listening on: :8080
INFO[0002] Request:
GET / HTTP/1.1
Host: localhost:8080
User-Agent: curl/7.42.0
Accept: */*


INFO[0002] Response code: HTTP/1.1 301 Moved Permanently
INFO[0002] Headers differ:
- X-Served-By: cache01.nyc
X-Varnish: 31037300
+ X-Served-By: cache01.sfo
X-Varnish: 10491072

Request:

$ curl -i localhost:8080
HTTP/1.1 301 Moved Permanently
Date: Tue, 19 May 2015 03:47:02 GMT
Server: Varnish
X-Varnish: 31097580
Vary: Accept-Encoding
X-Served-By: cache01.nyc
Location: https://frustra.org
Content-Length: 21
Connection: keep-alive

301 Moved Permanently