Installing and Configuring Squid
Subject:   Minimum-effort emergency bypass options?
Date:   2001-08-23 15:41:37
From:   sharumpe
Thank you for the great article! I am evaluating Squid for possible use in a campus environment, and one of the big concerns I have with any proxy is failure management.

Is there a way to configure squid to simply pass ALL requests directly through without doing anything? Here's a scenario to illustrate my question:

Say that a large group of users has been convinced to use the proxy for their Web browsing. Configuration of their browsers has been done and people are happy. Then one day something goes wrong (anything, really) and no one can get any Web sites. Obviously telling people to disable the proxy isn't the best solution, because they will never switch back once the problem is fixed.

What I would like to do is be able to put another configuration into place (a separate installation) which would answer on the same port but would just get fresh copies every time.

I apologize for the newbie nature of this question, but I don't know the proper terms to use to make my question any clearer.

Thank you,

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Showing messages 1 through 4 of 4.

  • Minimum-effort emergency bypass options?
    2001-08-23 17:50:25  turpie [View]

    Check out Proxy Auto-Config Files at
    You can use these to specify fallback settings just in case the proxy is down.
  • Followup: Minimum-effort emergency bypass options?
    2001-08-31 09:57:22  sharumpe [View]

    I just thought I'd post a followup on what I found.

    It appears that if you put in a couple more ACL lines, you can achieve what I was looking for:

    acl HTTP proto HTTP
    always_direct allow HTTP

    This will cause all queries to go directly "through" the proxy, without checking the cache. That way, if the drive fails or something goes drastically wrong, you can have a fresh install of Squid, configured with this, to take over until you can get things figured out, and no reconfiguration of the client browser is necessary.
    • Jennifer Vesperman photo Followup: Minimum-effort emergency bypass options?
      2003-01-26 17:54:42  Jennifer Vesperman | O'Reilly Author [View]

      Sorry I hadn't been checking, but that sounds like an excellent solution.

      Jenn V.
  • Jennifer Vesperman photo Minimum-effort emergency bypass options?
    2001-11-18 18:15:52  Jennifer Vesperman | O'Reilly Author [View]

    Thanks for the response - I like to hear when my articles are helpful.

    Your own response (munging the acl lists) should work as a pass-through. I like the autoproxy idea as well, it might be useful if you need to automate switching between a pass-through and a proxy configuration.

    Jenn Vesperman.