Unable to upload large files to website hosted on Plesk for Linux server: End of script output before headers

Symptoms

• Uploading large files to a website hosted on a Plesk for Linux server (for example, via WordPress Media Library) fails:

  PLESK_INFO: HTTP error

• The following error is found in Domains > example.com > Logs or in the file /var/www/vhosts/example.com/logs/error_log:

  CONFIG_TEXT: [core:error] [pid 4820] [client 203.0.113.2:33236] End of script output before headers: sdn_data.php, referer:

• All necessary limits are set correctly in Domains > example.com > PHP Settings (they are saved in the domain's PHP configuration file):

  # grep -e 'memory_limit' -e 'upload_max_filesize' -e 'post_max_size' -e 'file_uploads' /var/www/vhosts/system/example.com/etc/php.ini
  file_uploads = on
  upload_max_filesize = 256M
  post_max_size = 256M
  memory_limit = 256M
  max_file_uploads = 20

• The communication timeout limit has a sufficient value in the Apache configuration file /etc/httpd/conf.d/fcgid.conf:

  # grep 'FcgidIOTimeout' /etc/httpd/conf.d/fcgid.conf
  FcgidIOTimeout 320

Cause

The directive LimitRequestBody is define in the Apache configuration, domain's Apache & nginx Settings, or in the file .htaccess.

The directive LimitRequestBody specifies the number of bytes from 0 (meaning unlimited) to 2147483647 (2GB) that are allowed in a request body.

Resolution

Additional information

Apache HTTP Server - LimitRequestBody Directive