Answers.Body: <p>This turned out to be an unexpected odyssey.</p>
  
  <ol>
  <li>This error was misleading, and actually indicated that some of the page elements were being returned with 0 bytes.</li>
  <li>Those elements were civicrm php urls, and most of the errors we noticed where from a 4.7 installation.</li>
  <li>There were unhelpful messages in the php error log until I turned on 'catch_workers_output=yes' in the php-fpm.d/www.conf file.</li>
  <li>The detailed error 'WARNING: [pool php56u] child 31883 said into stderr: "zend_mm_heap corrupted"' led me to <a href="https://bugs.php.net/bug.php?id=65590" rel="nofollow">https://bugs.php.net/bug.php?id=65590</a></li>
  <li>A suggestion in that thread "opcache.fast_shutdown=0" appears to have resolved the issue.</li>
  </ol>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-05-06T15:44:07.387Z
Answers.LastActivityDate: 2016-05-06T15:44:07.387Z
Answers.UserDisplayName: Alan Dixon
Body: <p>Using Firefox on a Mac generates erratic and inconsistent error screens that say "Content Encoding Error". Sometimes reloading the page solves it, sometimes not.</p>
  
Tags: <admin><sysadmin>
Title: Why do I get a Content Encoding Error?
ThreadText: # Why do I get a Content Encoding Error?
  
  (Asked by: username_0 on 2016-05-06)
  
  Using Firefox on a Mac generates erratic and inconsistent error screens that say "Content Encoding Error". Sometimes reloading the page solves it, sometimes not.
  
  **Tags:** admin, sysadmin
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_0 on 2016-05-06. Score: 2
  
  This turned out to be an unexpected odyssey.
  
  1. This error was misleading, and actually indicated that some of the page elements were being returned with 0 bytes.
  2. Those elements were civicrm php urls, and most of the errors we noticed where from a 4.7 installation.
  3. There were unhelpful messages in the php error log until I turned on 'catch\_workers\_output=yes' in the php-fpm.d/www.conf file.
  4. The detailed error 'WARNING: [pool php56u] child 31883 said into stderr: "zend\_mm\_heap corrupted"' led me to <https://bugs.php.net/bug.php?id=65590>
  5. A suggestion in that thread "opcache.fast\_shutdown=0" appears to have resolved the issue.
  
  
  ---
  
  