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Editorial Team
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Asked: 2026-06-13T01:06:41+00:00

I just read that some browsers would prevent HTTP polling (I guess by limiting

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I just read that some browsers would prevent HTTP polling (I guess by limiting the rate of requests)…

From https://github.com/sstrigler/JSJaC:

Note: As security restrictions of most modern browsers prevent HTTP
Polling from being usable anymore this module is disabled by default
now. If you want to compile it in use ‘make polling’.

This could explain some misbehavior of some of my JavaScripts (sometimes requests are just not sent or retried, even if they were actually successful). But I couldn’t find further information on details..

Questions

  • if it’s “max. number of requests n per x seconds”, what are the usual/default settings for x and n?
  • Is there any way good resource for this?
  • Any way to detect if a request has been “delayed” or “rejected” because of a rate limit?

Thanks for your help…

Stefan

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1 Answer

  1. Editorial Team

    Stefan, quick answers below:

    -if it’s “max. number of requests n per x seconds”, what are the usual/default settings for x and n?
    This sounds more like a server restriction. The browser ones usually sound like:
    -“the maximum requests for the same hostname is x”
    -“the maximum connections for ANY hostname is y”

    -Is there any way good resource for this?
    http://www.browserscope.org/?category=network (also hover over table headers to see what is measured)
    http://www.stevesouders.com/blog/2008/03/20/roundup-on-parallel-connections

    -Any way to detect if a request has been “delayed” or “rejected” because of a rate limit?
    You could look at the http headers for “Connection: close” to detect server restrictions but I am not aware of being able in JavaScript to read settings from so many browsers in a consistent, browser-independent way. (For Firefox, you could read this http://support.mozilla.org/en-US/questions/746848)

    Hope this quick answer helps?

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