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Before we get into the source code, I want to point it out again that the entire trick bases on HTTP/1.1 Chunked Encoding at http://www.ietf.org/rfc/rfc2616.txt A successful use also relies on that all servers between your applications fully comply with the Chunked Encoding and do not cache either request or response. These servers may be proxy, firewall, load balancer, http server, servlet container, etc. However today's most server products support HTTP/1.1 very well. And usually they do not cache for POST. A POST may contain a large file in MB even GB.