httpd mod_proxy_fcgi printing: AH01075: Error dispatching request to : (passing brigade to output filters)

Solution In Progress - Updated -

Issue

  • Apache httpd24 configured as reverse proxy for PHP-FPM (rh-php56-php-fpm from RHSCL) via standard ProxyPassMatch, e.g.:

    ProxyPassMatch ^/(.*\.php(/.*)?)$ fcgi://127.0.0.1:9000/var/www/html/$1

    Lots of clients and things seem to work fine, but the logs fill up with messages like this:

    [Wed May 04 11:08:46.482577 2016] [proxy_fcgi:error] [pid 34770] (104)Connection reset by peer: [client 10.0.0.1:59660] AH01075: Error dispatching request to : (passing brigade to output filters), referrer: https://www.example.com

Environment

  • Red Hat Enterprise Linux
  • Apache httpd configured with mod_proxy_fcgi

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