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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.

What is HTTP Basic Authentication

A method for a user agent to provide a login/password. Uses the Authorization field in the HTTP header in each requests.

Does not require cookies, sessions or login. Typically the browser caches the credentials to avoid asking them to the user on each requests.

The credentials "login:password" are encoded in Base64.

See wikipedia