portproxy

A shitty TCP proxy that relays all requests to a local port to a remote server.

portproxy -port 8080 -raddr google.com:80

Will proxy all TCP requests on localhost:8080 and send them to google.com.

Highjacking HTTP

If the http flag is given:

portproxy -http -port 8080 -raddr google.com:80

The proxy will attempt to detect HTTP requests. If a HTTP request contains an Origin header, the response from the remote server will be modified to include a Access-Control-Allow-Origin: * header.

Motivation

The sole purpose of this proxy was to bypass a remote API that didn't do CORS.