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Can't upload large files over PHP in Plesk: HTTP request length exceeds MaxRequestLen

Vincent Lauton
Updated
Plesk for Linux kb: technical

Applicable to:

  • Plesk for Linux

Symptoms

  • Uploading large files through PHP apps to a Plesk domain fails: 500 Internal Server Error, 502 Bad Gateway

  • The domain's Apache error log shows this message if nginx support is enabled:

    mod_fcgid: HTTP request length ... (so far) exceeds MaxRequestLen (1310720)

  • The domain's nginx error log shows this message:

    upstream prematurely closed connection while reading response header from upstream

Cause

The Apache parameters FcgidMaxRequestLen and FcgidMaxRequestInMem have too low of a value for the file's size.

Resolution

   
Individual Domain
   

  1. Log into Plesk

  2. Go to Domains > example.com > Apache & Nginx settings

  3. Add these lines to Additional directives for HTTP & HTTPS:

    <IfModule mod_fcgid.c>
    FcgidMaxRequestLen 1073741824
    FcgidMaxRequestsPerProcess 100
    FcgidProcessLifeTime 7200
    FcgidIOTimeout 7200
    FcgidMaxRequestInMem 1073741824
    </IfModule>

   
   
All Domains
   
       

The following solution only works with FPM application served by Apache. For other handlers, use custom templates.

  1. Connect to the server via SSH

    Note: Contact the server administrator if there's no SSH access

  2. Edit fcgid.conf:

    • RHEL-based OS: /etc/httpd/conf.d/fcgid.conf
    • Debian based OS: /etc/apache2/mods-available/fcgid.conf

  3. Set the same value for FcgidMaxRequestLen and FcgidMaxRequestInMem in bytes. For example, 1073741824 for 1G.

  4. Restart Apache:

    Warning: Websites will be down for a short time while restarting Apache

    For RHEL-based OS

    # service httpd restart || service apache2 restart

   
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