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HTTP pipelining
Implementation in web servers
Implementing pipelining in web servers is a relatively simple matter of making sure that network buffers are not discarded between requests. For that reason, most modern web servers handle pipelining without any problem.
Exceptions include IIS 4 and reportedly 5.
Implementation in web browsers
Internet Explorer as of version 7 doesn't support pipelining.
Mozilla Firefox 3.0 supports pipelining, but it's disabled by default. It uses some heuristics, especially to turn pipelining off for IIS servers. Instructions for enabling pipelining can be found at Firefox Help: Tips & Tricks. Camino does the same thing as Firefox.
Konqueror 2.0 supports pipelining, but it's disabled by default. Instructions for enabling it can be found at Konqueror: Tips & Tricks.
Opera has pipelining enabled by default. It uses heuristics to control the level of pipelining employed depending on the connected server.
Google Chrome is not believed to support pipelining.
Implementation in web proxies
Most HTTP proxies do not pipeline outgoing requests.
Some versions of the Squid web proxy will pipeline up to two outgoing requests. This functionality has been disabled in the latest versions. Squid supports multiple requests from clients.
The Polipo proxy pipelines outgoing requests.
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