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HTTP is the application-layer protocol that most web pages are transferred with. This preference controls which version of HTTP to use if a proxy server is not configured.

Possible values and their effects


Use HTTP 0.9.


Use HTTP 1.0.


Use HTTP 1.1. (Default)


Recommended settings

This preference should usually be left at the default of 1.1. 1.0 can be used if dealing with older server software, and will still work on the Internet at large. 0.9 will generally not work and is not recommended.

First checked in

2001-05-11 by Darin Fisher

Has an effect in

  • Netscape (all versions since 6.1)
  • Mozilla Suite (all versions since 0.9)
  • Mozilla Phoenix (all versions)
  • Mozilla Firebird (all versions)
  • Mozilla Firefox (all versions)
  • SeaMonkey (all versions)
  • Camino (all versions)
  • Minimo (all versions)

Related bugs

Related preferences

External links