I'm dealing with a system where the Quick Search box is not working. Using the browser dev tools shows ajax requests being sent but receiving a '406 Not acceptable' error.

According to https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/406 this relates to content negotiation.

The AJAX URL is:


and the content negotiation headers in the request are:

Accept: application/json, text/javascript, */*; q=0.01
Accept-Encoding: gzip, deflate, br
Accept-Language: en-GB,en;q=0.5

This matches what I see on another system that is working normally.

This is CiviCRM 5.5.2 on Joomla 3.8.13

Any ideas?


1 Answer 1


Does the webserver support compression? Might be a disabled module (e.g. mod_gzip in apache). The Accept-Encoding suggests only compressed data is accepted.

  • Thanks - I've tried changing the Accept-Encoding header to various things including * and all fail. On a different system I've also tried the same changes and I can't get that to fail so I'm wondering with it really is a 406 or something else that is wrongly identifying.
    – Aidan
    Nov 29, 2018 at 18:11
  • If you're seeing a 406 status, I do think it'll be coming from your webserver or Joomla and not CiviCRM. CiviCRM's HTTP response code vocab doesn't include 406 AFAIK. Any of those Accept* headers could trigger a 406 if the application couldn't satisfy them. Nov 29, 2018 at 18:44
  • Maybe a .htaccess file that is weird. It's possible for mod_rewrite for example to be told to return 406 for certain url patterns. Or maybe mod_security blocking it and returning 406.
    – Demerit
    Nov 29, 2018 at 22:02

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