Have you ever had the problem appear within SE 4.1.8+ with the following error:

Notice: Undefined index: HTTP_ACCEPT_ENCODING in /home/mysite/public_html/application/index.php on line 116
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Error code: 850649

This problem can be fixed in two ways the first:

The server your site is on could not be supporting compression (gzip).

Do an environment check via the admin panel to check this.

The Second way to fix the problem is:

application/index.php

Find

// Get Gzipping Option
if( file_exists( APPLICATION_PATH_SET . DS . 'cache.php' ) ) {
  $cache_array = include APPLICATION_PATH_SET . DS . 'cache.php';
  if( isset( $cache_array['frontend']['core']['gzip'])  ) {
    if( $cache_array['frontend']['core']['gzip'] == TRUE ){
      if (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')) ob_start("ob_gzhandler"); else ob_start();
    }
  }
}

Replace with:

// Get Gzipping Option
if( file_exists( APPLICATION_PATH_SET . DS . 'cache.php' ) ) {
  $cache_array = include APPLICATION_PATH_SET . DS . 'cache.php';
  if( isset( $cache_array['frontend']['core']['gzip'])  ) {
    if( $cache_array['frontend']['core']['gzip'] == TRUE ){
      if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')) ob_start("ob_gzhandler"); else ob_start();
    }
  }
}

This should fix your problem is the first fix was not the cause.

I recommend that you make sure, that the Apache module mod_deflate is installed and active on the server. You can check this with your host.

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