Why Does My WordPress Import Fail with a \'POST Content-Length Exceeds Limit\' Warning, and How Can I Fix It?

PHP Warning: Content-Length Exceeds Limit

When attempting to upload an import in WordPress on a local XAMPP dev environment, users may encounter the error:

Warning: POST Content-Length of [bytes] exceeds the limit of [bytes] in Unknown on line 0

Despite increasing the upload_max_filesize value to 1000M, the issue persists.

Solution:

The error indicates that the maximum post size allowed by PHP is exceeded. The default limit is 8M, which is 8388608 bytes. To resolve this, the post_max_size value must be increased in the php.ini file.

upload_max_filesize controls the maximum size of individual files that can be uploaded, while post_max_size specifies the maximum total size of the data that can be submitted via a POST request.

Therefore, the post_max_size value must be set larger than the combined size of all uploaded files.

Steps:

1. Open the php.ini file located in the XAMPP installation directory (e.g., /Applications/XAMPP/etc/php.ini for macOS).
2. Locate the post_max_size directive and increase its value to an appropriate size (e.g., 100M).
3. Save the changes and restart the Apache server.
4. Attempt the import again. The error should no longer appear.

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