I'm noticing silent failures using HTTPClientFactory with len(url) >= 16400. The factory's deferred object immediately calls its associated callBack() method without sending any data (the server is likewise written with twisted python, but it doesn't appear to ever receive data). The errorBack() doesn't fire, either. A url with len <= 16398 works just fine, firing the callback /after/ sending the data. According to RFC 2616, arbitrary length URLs are allowed by HTTP, but I understand that there are practical limitations in many implementations. Is the 16400 url-length ceiling a known limitation in twisted, or am I banging up against something else? thanks, Lenny ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs