how to set proxy while replaying

[salomon1184]

I‘d like to replay http request to target web server，meanwhile set proxy to a fuzz proxy（just like fiddler）to gernerate some bad requests， but goreplay seems not support setting http proxy， is there a plan to support this situation？

[buger]

You can try set proxy via HTTP_PROXY environment variable like this: export HTTP_PROXY="http://proxyIp:proxyPort"

GoReplay itself has no any specific support for proxies, but underlying Go network stack should respect ENV variable mentioned above.

[salomon1184]

I have tried, but It doesn't seem work.

[mattrobenolt]

Just to chime in here, HTTP_PROXY definitely doesn't work because gor uses it's own HTTP client. The HTTP_PROXY support in native Go, is a part of the HTTP transport, which isn't leveraged here. It's not a network/tcp level thing, it's a change to the way HTTP requests are formed and sent.

https://github.com/buger/goreplay/blob/master/http_client.go#L86-L106

I'm looking to add this in a fork, just something hacky to make it work for my use case.

[zhizouxiao]

There is way to do it which is kind of trickey. you can request the proxy with modified header. For example, goreplay --input-file "requests.gor" --output-http http://proxy_host:proxy_port/request_path -http-set-header "Host:request_host"

[nagendra547]

I am also facing the same problem. Looks like goreplay is not following the http proxy set in environment.

[nagendra547]

@mattrobenolt How did you make it work with your fix? Did you replay like this? It didn't workout for me.

http_proxy=http://proxy_server:proxy_port
https_proxy=http://proxy_server:proxy_port

./gor --input-file file.log --output-stdout --output-http destination-host:80 --output-http-track-response

[mattrobenolt]

@nagendra547 I forked goreplay and added support for it.

See: https://github.com/mattrobenolt/goreplay/tree/http-proxy

I used this in a production setting just fine without any issues.

[buger]

@mattrobenolt love it! Can you create a pull request?

Thank you!

[mattrobenolt]

@buger #655 enjoy. :)

[nagendra547]

@mattrobenolt Thanks ! Let me try it out. For building the binaries are you using this step mentioned

https://github.com/buger/goreplay/wiki/Compilation

Or building in some different way?

[mattrobenolt]

Yeah, it would have been that. It's been a while, but that seems right.

[nagendra547]

Thanks @mattrobenolt . Worked like a charm! :)

[buger]

Just released RC2 with this change https://github.com/buger/goreplay/releases/tag/v1.0-rc2