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Today I Learned - HTTP

What is the maximum number of connections a browser can make ?

Theoretically, a limit of two connections per hostname is suggested by HTTP/1.1.

See HTTP/1.1 - RFC 2616, section 8.1.4 "Connections - Practical consideration"

A single-user client SHOULD NOT maintain more than 2 connections with any server or proxy.

Generally speaking, browsers open between 6 and 8 connections per server.

For example:

  • IE8 uses 6 connections
  • Firefox 3 uses 6 connections

It is also possible to reconfigure the browser to use different limits.

See also browserscope or Steve Souders' Roundup on Parallel Connections.