Network.http.max-persistent-connections-per-server: Difference between revisions
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{{preference|pref=network.http.max-persistent-connections-per-server}} | {{preference|pref=network.http.max-persistent-connections-per-server}} | ||
==Background== | ==Background== | ||
[ | [http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol HTTP] is the application-layer protocol that most web pages are transferred with. HTTP keep-alive connections can be re-used for multiple requests, as opposed to non-keep-alive connections, which are limited to one request. Using keep-alive connections improves performance. If a proxy server is not configured, the total number of HTTP keep-alive connections the application can make to each site is limited by this preference. If more connections are needed, they are queued until a connection "slot" is available. | ||
==Possible values and their effects== | ==Possible values and their effects== | ||
This preference takes values between 1 and 255 inclusive, directly corresponding to the maximum number of HTTP keep-alive connections the application can have open at once to a single server. (Default: 2.) | This preference takes values between 1 and 255 inclusive, directly corresponding to the maximum number of HTTP keep-alive connections the application can have open at once to a single server. (Default: 2. Firefox 3: 6) | ||
==Caveats== | ==Caveats== | ||
* This preference only has an effect if you are not using a proxy. If you are using a proxy, see [[network.http.max-persistent-connections-per-proxy]]. | * This preference only has an effect if you are not using a proxy. If you are using a proxy, see [[network.http.max-persistent-connections-per-proxy]]. | ||
* The maximum number of connections of any type | * The maximum number of connections of any type is controlled by [[network.http.max-connections]], which will always take precedent over this preference. | ||
* | * This preference has no effect unless Keep-Alive ([[network.http.keep-alive]]) is enabled. | ||
==Recommended settings== | ==Recommended settings== | ||
If you are not using a proxy and experience problems not being able to download multiple files, you can raise this value. It is, however, considered poor etiquette to make too many connections to a server and may lead to you being banned from that server. | If you are not using a proxy and experience problems not being able to download multiple files, you can raise this value. It is, however, considered poor etiquette to make too many connections to a server and may lead to you being banned from that server. Anything above 10 is excessive. | ||
==First checked in== | ==First checked in== | ||
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==Related bugs== | ==Related bugs== | ||
* [https://bugzilla.mozilla.org/show_bug.cgi?id=83526 Bug 83526 - http should use fewer connections per server per page] | * [https://bugzilla.mozilla.org/show_bug.cgi?id=83526 Bug 83526 - http should use fewer connections per server per page] | ||
* [https://bugzilla.mozilla.org/show_bug.cgi?id=423377 Bug 423377 - Change max-persistent-connections-per-server to 6.] | |||
==Related preferences== | ==Related preferences== | ||
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==External links== | ==External links== | ||
* [http://www.mozilla.org/quality/networking/docs/netprefs.html Networking Preferences] | * [http://www.mozilla.org/quality/networking/docs/netprefs.html Networking Preferences] | ||
* [http://groups.google.com/group/mozilla.dev.apps.firefox/browse_thread/thread/5eebb8c65c34c3c6/323b25cfd9211fa0 Raising network.http.max-persistent-connections-per-server? (mozilla.dev.apps.firefox)] | |||
* [http://gemal.dk/blog/2008/03/18/firefox_3_beta_5_will_have_improved_connection_parallelism/ Firefox 3 beta 5 will have improved connection parallelism (Henrik Gemal’s blog)] | |||
[[Category:Preferences]] | [[Category:Preferences]] | ||
[[Category:Tweaking preferences]] | [[Category:Tweaking preferences]] | ||
Latest revision as of 21:46, 23 November 2015
Background
HTTP is the application-layer protocol that most web pages are transferred with. HTTP keep-alive connections can be re-used for multiple requests, as opposed to non-keep-alive connections, which are limited to one request. Using keep-alive connections improves performance. If a proxy server is not configured, the total number of HTTP keep-alive connections the application can make to each site is limited by this preference. If more connections are needed, they are queued until a connection "slot" is available.
Possible values and their effects
This preference takes values between 1 and 255 inclusive, directly corresponding to the maximum number of HTTP keep-alive connections the application can have open at once to a single server. (Default: 2. Firefox 3: 6)
Caveats
- This preference only has an effect if you are not using a proxy. If you are using a proxy, see network.http.max-persistent-connections-per-proxy.
- The maximum number of connections of any type is controlled by network.http.max-connections, which will always take precedent over this preference.
- This preference has no effect unless Keep-Alive (network.http.keep-alive) is enabled.
Recommended settings
If you are not using a proxy and experience problems not being able to download multiple files, you can raise this value. It is, however, considered poor etiquette to make too many connections to a server and may lead to you being banned from that server. Anything above 10 is excessive.
First checked in
Has an effect in
- Netscape (all versions since 7.0)
- Mozilla Suite (all versions since 0.9.4)
- Mozilla Phoenix (all versions)
- Mozilla Firebird (all versions)
- Mozilla Firefox (all versions)
- SeaMonkey (all versions)
- Camino (all versions)
- Minimo (all versions)
Related bugs
- Bug 83526 - http should use fewer connections per server per page
- Bug 423377 - Change max-persistent-connections-per-server to 6.
Related preferences
- network.http.max-connections
- network.http.max-connections-per-server
- network.http.max-persistent-connections-per-proxy
