Hi Guys! I'm new to the twisted framework and I'm using it to write a simple HTTPProxy with rewrite capabilities. While calling ProxyCiient.handleHeader method, it seems that Content-Length field is being added. Notice that I say "add" instead of "set": def handleHeader(self, key, value): *if key.lower() in ['server', 'date', 'content-type']:* self.father.responseHeaders.setRawHeaders(key, [value]) else: *self.father.responseHeaders.addRawHeader(key, value)* Look at this headers that I get if I use handleHeader method: HTTP/1.1 200 OK *Content-Length: 3025 Content-Length: 53* Host: localhost:8001 Accept: */* Server: Coco el servidor Connection: close Date: Tue, 07 Aug 2012 20:35:13 GMT User-Agent: curl/7.19.7 (i486-pc-linux-gnu) libcurl/7.19.7 OpenSSL/0.9.8k zlib/1.2.3.3 libidn/1.15 Content-Type: text/html So question is, am I using it properly? I'm adjusting the content length field as the data changed. Thanks in advanced, Daniel "En economía no hay nada misterioso ni inaccesible al entendimiento del hombre de la calle. Si hay un misterio, reside él en el oculto propósito que puede perseguir el economista y que no es otro que la disimulación del interés concreto a que se sirve." A. Jauretche