Use in Web Browsers
Netscape Navigator (since at least 4.05) and Internet Explorer (since at least 4.01) support persistent connections to Web servers and proxies.
Netscape does not close persistent connections using timeout. All idling persistent connections are queued. When there is a need to open new persistent connections while connecting to a different server, the idle connections are killed by the browser using some form of LRU algorithm.
Internet Explorer supports persistent connections. By default, versions 6 and 7 use 2 persistent connections while version 8 uses 6. Persistent connections time out after 60 seconds of inactivity which is changeable via the Windows Registry.
Mozilla Firefox supports persistent connections. The number of simultaneous connections can be customized (per-server, per-proxy, total). Persistent connections time out after 115 seconds (1.92 minutes) of inactivity which is changeable via the configuration.
Opera supports persistent connections since 4.0. The number of simultaneous connections can be customized (per-server, total).
Read more about this topic: HTTP Persistent Connection
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