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Editorial Team
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Asked: 2026-05-12T07:05:24+00:00

I need to maintain multiple active long-pooling AJAX connections to the Webserver. I know

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I need to maintain multiple active long-pooling AJAX connections to the Webserver.

I know that most browsers don’t allow more then 2 simultaneous connections to the same server. This is what the HTTP 1.1 protocol states:

Clients that use persistent
connections SHOULD limit the number of
simultaneous connections that they
maintain to a given server. A
single-user client SHOULD NOT maintain
more than 2 connections with any
server or proxy. A proxy SHOULD use up
to 2*N connections to another server
or proxy, where N is the number of
simultaneously active users. These
guidelines are intended to improve
HTTP response times and avoid
congestion.

Supposing that I have 2 sub-domains Server1.MyWebSite.Com and Server2.MyWebSite.Com sharing the same IP address, will I be able to make 2×2 simultaneous connections?

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1 Answer

  1. Editorial Team

    It does appear that different hostnames on the same IP can be useful. You may run into issues when making the AJAX connections due to Same Origin Policy.

    Edit: As per your document.domain question (from Google’s Browser Security Handbook):

    Checks for XMLHttpRequest targets do not take document.domain into account…

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