Intercept HTTP CONNECT Method / Tunnel only

Hi,

I’m fairly new to HAProxy and trying to establish if it is possible to replicate something that we can do within Fiddler Fiddler Classic but move to HAProxy…

Essentially, all I want to do is let all traffic pass through to another internal/internet proxy and intercept only a specific HTTP CONNECT method.

E.G. If host = example.com then rewrite to host = example.co.uk.
As a result, all traffic will tunnel to the new host…

For example in Fiddler I can script like this :

// Capture only example.com and rewrite host to example.co.uk for the CONNECT method and tunnel
if (oSession.HTTPMethodIs("CONNECT") && (oSession.host == "example.com:443")) { 
	oSession.host = "example.co.uk:443";
}

Client → HAProxy [Intercept CONNECT / Rewrite ] → Internal Proxy → Internet

Is this even possible with HAProxy…???
I cannot seem to find exact similar use-cases…

Thanks!
J

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