I need to validate some user requests, so I'm trying to use LittleProxy. The idea is to make it transparent to users (iptables > littleproxy > origin server).
So I'm using iptables to redirect the flow to LittleProxy (that is listening on 127.0.0.1:3127) as follows:
iptables -t nat -A OUTPUT -p tcp -o eth0 --dport 80 -j DNAT --to 127.0.0.1:3127
If I start it using withTransparent(true), I receive an error 400 Bad Request to URI. This occurs due to RFC 7230 compliance.
final HttpProxyServer server = DefaultHttpProxyServer.bootstrap()
.withPort(3127).withTransparent(true).start();
So I tried to start it as follows, and change the request URI:
final HttpProxyServer server = DefaultHttpProxyServer.bootstrap()
.withPort(3127).withTransparent(false)
.withFiltersSource(new HttpFiltersSourceAdapterExt()).start();
And overrided the method as follows:
@Override
public HttpResponse clientToProxyRequest(HttpObject httpObject) {
if (httpObject instanceof DefaultHttpRequest) {
final DefaultHttpRequest request = (DefaultHttpRequest) httpObject;
final String host = request.headers().get(HttpHeaders.Names.HOST);
request.setUri("http://" + host + request.getUri());
}
return null;
}
But changing the URI causes an endless loop into LittleProxy. Each time adding a new Via header.
I also tried to use .withAllowRequestToOriginServer(true) but with .withTransparent(true) will also cause an endless loop.
Studying DirectRequestTest.java I saw that I could test the headers and check if it already have a "Via", but I don't want to abort the request. I still want LittleProxy to call origin server, retrieve and serve the response to users.
So my question is, how do I implement this scenario with LittleProxy?
