Knowledge Base

Unable to upload large files via PHP on Plesk server: HTTP request length exceeds MaxRequestLen

Symptoms

When using PHP as FastCGI, if you try to upload a large file, the below error occurs and causes 550 internal server error or 502 Bad Gateway.
If nginx support is enabled, Apache /var/www/vhosts/system/example.com/logs/error_logcontains the following error:
```
mod_fcgid: HTTP request length ... (so far) exceeds MaxRequestLen (1310720)
```
Nginx /var/www/vhosts/system/example.com/logs/proxy_error_logcontains the error below:
```
upstream prematurely closed connection while reading response header from upstream
```

Cause

The FcgidMaxRequestLen and/or FcgidMaxRequestInMem directives are not large enough.

Resolution

Click on a section to expand

Server-wide

Connect to the server via SSH.
Note: if direct SSH access to the server is not possible, contact server administrator for further assistance.
Edit fcgid.conf file which is located in /etc/httpd/conf.d/ (for RHEL based OS) or /etc/apache2/mods-available/ (for Debian based OS).
Set FcgidMaxRequestLen and FcgidMaxRequestInMem with the same values in bytes. For example, 1024 MB corresponds to 1073741824 B.
Restart Apache:

For RHEL based OS

# service httpd restart

For Debian based OS:

# service apache2 restart

Click on a section to expand

On domain level

Log into Plesk

Go to Domains > example.com > Apache & Nginx settings > Additional directives for HTTP & HTTPS

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