Capture the request and response to store in a file about mitm

[kr]

You might want to look at httputil.DumpRequestOut and httputil.DumpResponse — I bet those will help!

[kr]

For plaintext http, I'd suggest bypassing this package altogether. There should be no need for mitm in that case.

[santhoshTpixler]

It helped me well. But for response capturing, I have only http.ResponseWriter

[kr]

Ah, true. You might be able to use httptest.ResponseRecorder to make a second ResponseWriter, and provide that to the upstream handler to capture the response. Then you could use its Result method to dump the result.

You'll probably also have to write some code to copy the result data from the ResponseRecorder to the original ResponseWriter that goes to the client.

Note that this will mean collecting the entire response in memory. If it's a big response, that'll take a lot of memory and the client will have to wait longer for the response. If that's not okay, then you could instead make your own wrapper type for the ResponseWriter that streams the response, bit by bit, to both the client and to the file. That would mean writing significantly more code.

Finally, you should use httputil.DumpRequest instead of DumpRequestOut. Sorry for the wrong advice before.

[santhoshTpixler]

@kr Got it. Thank you for your valuable support.

[santhoshTpixler]

@kr HTTPS requests are proxied as expected. But HTTP requests are getting timed out. Any idea on how to fix it?

[brydavis]

Use a multi-writer to write bytes to multiple readers.

Standard output used here, but you could add / replace it with a file, etc.

m := io.MultiWriter(
	w.ResponseWriter,
	os.Stdout,
)

m.Write([]byte("some data..."))