How can you alter what is sent back?

[myers]

I would like to create a blacklisting MITM proxy, where at initialization time I give a list of hosts, and when a request (http/https) is made to that host, the proxy just returns an empty document and status code 200.

This is to be used as a way to filter out all the tracking cookies while running rspec feature test with headless chrome.

If this is possible perhaps add directions for it in the readme.md?

Thanks!

[myers]

I made what I want, not sure if this use case interests you:

require 'evil-proxy'

EvilProxy::AgentProxyServer.class_eval do
  
  alias perform_proxy_request_without_hijack perform_proxy_request
  def perform_proxy_request(req, res, &block)
    puts req.host.inspect
    if req.host == "localhost"
      perform_proxy_request_without_hijack(req, res, &block)
    else
      res.status = 200
      res.body = ""
      res['proxy-connection'] = "close"
      res['connection'] = "close"
      res['content-type'] = "text/plain"        
    end
  end
end
    
class EvilerProxy < EvilProxy::MITMProxyServer
  alias perform_proxy_request_without_hijack perform_proxy_request
  def perform_proxy_request(req, res, &block)
    puts req.host.inspect
    if req.host == "localhost"
      perform_proxy_request_without_hijack(req, res, &block)
    else
      res.status = 200
      res.body = ""
      res['proxy-connection'] = "close"
      res['connection'] = "close"
      res['content-type'] = "text/plain"        
    end
  end
end

proxy = EvilerProxy.new Port: 8080

trap "INT"  do proxy.shutdown end
trap "TERM" do proxy.shutdown end

proxy.start