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    <p>To create <code>ProxyFactory</code> that can modify server response headers, content you could override <a href="http://twistedmatrix.com/trac/browser/trunk/twisted/web/proxy.py#L62" rel="noreferrer"><code>ProxyClient.handle*()</code> methods</a>:</p> <pre><code>from twisted.python import log from twisted.web import http, proxy class ProxyClient(proxy.ProxyClient): """Mangle returned header, content here. Use `self.father` methods to modify request directly. """ def handleHeader(self, key, value): # change response header here log.msg("Header: %s: %s" % (key, value)) proxy.ProxyClient.handleHeader(self, key, value) def handleResponsePart(self, buffer): # change response part here log.msg("Content: %s" % (buffer[:50],)) # make all content upper case proxy.ProxyClient.handleResponsePart(self, buffer.upper()) class ProxyClientFactory(proxy.ProxyClientFactory): protocol = ProxyClient class ProxyRequest(proxy.ProxyRequest): protocols = dict(http=ProxyClientFactory) class Proxy(proxy.Proxy): requestFactory = ProxyRequest class ProxyFactory(http.HTTPFactory): protocol = Proxy </code></pre> <p>I've got this solution by looking at the source of <a href="http://twistedmatrix.com/trac/browser/trunk/twisted/web/proxy.py" rel="noreferrer"><code>twisted.web.proxy</code></a>. I don't know how idiomatic it is.</p> <p>To run it as a script or via <code>twistd</code>, add at the end:</p> <pre><code>portstr = "tcp:8080:interface=localhost" # serve on localhost:8080 if __name__ == '__main__': # $ python proxy_modify_request.py import sys from twisted.internet import endpoints, reactor def shutdown(reason, reactor, stopping=[]): """Stop the reactor.""" if stopping: return stopping.append(True) if reason: log.msg(reason.value) reactor.callWhenRunning(reactor.stop) log.startLogging(sys.stdout) endpoint = endpoints.serverFromString(reactor, portstr) d = endpoint.listen(ProxyFactory()) d.addErrback(shutdown, reactor) reactor.run() else: # $ twistd -ny proxy_modify_request.py from twisted.application import service, strports application = service.Application("proxy_modify_request") strports.service(portstr, ProxyFactory()).setServiceParent(application) </code></pre> <h3>Usage</h3> <pre><code>$ twistd -ny proxy_modify_request.py </code></pre> <p>In another terminal:</p> <pre><code>$ curl -x localhost:8080 http://example.com </code></pre>
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    1. COI tried this one and I keep getting a Content Encoding Error. Any Ideas?
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    2. CO@dulac: `buffer.upper()` probably should not be called on arbitrary content. Replace it by mere `buffer`.
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    3. COSebastion: Ok! This is the one I'm going with. I can view the content as it goes through. Also, I didn't use your main function. I did: from twisted.internet import reactor reactor.listenTCP(8080, ProxyFactory() ) reactor.run() And it works just the same
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