Unable to process certain action in WordPress: POST Content-Length of 9795417 bytes exceeds the limit of 8388608 bytes

Batyr Tarpakov

Updated April 17, 2025 03:57

Plesk for Linux kb: technical

Applicable to:

Unable to upload a file or edit a page via a WordPress plugin builder for the domain example.com;
The error like the one below or a similar is logged in the error logs:
CONFIG_TEXT: Got error 'PHP message: PHP Warning: POST Content-Length of 9795417 bytes exceeds the limit of 8388608 bytes in Unknown on line 0', referer: https://example/wp-admin/theme-install.php?browse=popular

Low values for the post_max_size and upload_max_filesize PHP variables.

Increase the values for the specific variables:

2. Go to Domains > example.com > PHP Settings;

3. Increase value for the post_max_size and upload_max_filesize directives;

4. Scroll down and press the OK button to apply the changes.