MITM - Getting BadRequest

[Raju Boopathi]

I am setting up a MITM proxy and then planning to rewrite the URL (just the Host and Port) to forward that request to a different server.
Below is the code and I am getting Bad Request. Any help is much appreciated.


HttpProxyServer server =  DefaultHttpProxyServer.bootstrap()
                .withPort(9080)
                .withManInTheMiddle(new SelfSignedMitmManager())
                .withFiltersSource(new HttpFiltersSourceAdapter() {
                    @Override
                    public HttpFilters filterRequest(HttpRequest originalRequest) {
                        return new HttpFiltersAdapter(originalRequest) {
                            public HttpResponse clientToProxyRequest(HttpObject httpObject) {

                                if (httpObject instanceof HttpRequest) {

                                }
                                return null;
                            }

                            public HttpResponse proxyToServerRequest(HttpObject httpObject) {
                                if (httpObject instanceof HttpRequest) {
                                    HttpRequest httpRequest = (HttpRequest)httpObject;
                                    httpRequest.headers().set(HttpHeaders.Names.HOST, "localhost:8080");
                                 }
                                 return null;
                            }

                            public HttpObject serverToProxyResponse(HttpObject httpObject) {
                                if (httpObject instanceof HttpResponse) {
   
   
                                } else if (httpObject instanceof HttpContent) {
   
                                }
                                return httpObject;
                            }

                            public HttpObject proxyToClientResponse(HttpObject httpObject) {
                                if (httpObject instanceof HttpResponse) {
   
                                } else if (httpObject instanceof HttpContent) {
   
                                }
                                return httpObject;
                            }
                        };
                    }
                })
                .start();
      

Below is the error from the log
[2015-04-28 10:56:50,199] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL): Configuring ChannelPipeline
[2015-04-28 10:56:50,200] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL): Created ClientToProxyConnection
[2015-04-28 10:56:50,200] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: Connected
[2015-04-28 10:56:50,200] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: Reading: DefaultHttpRequest(decodeResult: failure(java.lang.IllegalArgumentException: text is empty))
GET /bad-request HTTP/1.0
[2015-04-28 10:56:50,200] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: Got request: DefaultHttpRequest(decodeResult: failure(java.lang.IllegalArgumentException: text is empty))
GET /bad-request HTTP/1.0
[2015-04-28 10:56:50,200] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: serverHostAndPort 
[2015-04-28 10:56:50,200] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: Ensuring that hostAndPort are available in /bad-request
[2015-04-28 10:56:50,200] WARN  [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: No host and port found in /bad-request
[2015-04-28 10:56:50,201] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: Retaining reference counted message
[2015-04-28 10:56:50,201] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: Writing: DefaultFullHttpResponse(decodeResult: success)
HTTP/1.1 502 Bad Gateway
Content-Length: 25
Content-Type: text/html; charset=UTF-8
Connection: close
[2015-04-28 10:56:50,201] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: Writing an empty buffer to signal the end of our chunked transfer
[2015-04-28 10:56:50,201] DEBUG [oxy-ClientToProxyWorker-2] y.impl.ClientToProxyConnection -- (AWAITING_INITIAL) [id: 0x965835e1, /127.0.0.1:53822 => /127.0.0.1:9080]: Wrote: DefaultFullHttpResponse(decodeResult: success)
HTTP/1.1 502 Bad Gateway
Content-Length: 25
Content-Type: text/html; charset=UTF-8
Connection: close

[Raju Boopathi]

I am testing with HTTPS request.