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The specific behavior you're reporting here is an issue with your server configuration -- these are exceptions that are printed back to the browser. Usage of some combinations/versions of PHP extensions interferes with this. Notably, opcode caches not designed for the PHP version in use or other outdated debugging-related extensions.The behavior you see on XenForo.com, for example, is a different issue. It's down to how PHP behaves when you send data longer than post_max_size (regardless of the upload_max_size value). PHP truncates the response, which causes various oddities to happen. In this case, returning HTML content instead of JSON. The error is about the missing CSRF token so it's not actually particularly useful. This is a value that can only be changed before PHP starts up. I'm not sure what can be done in this case, though I will look.
The specific behavior you're reporting here is an issue with your server configuration -- these are exceptions that are printed back to the browser. Usage of some combinations/versions of PHP extensions interferes with this. Notably, opcode caches not designed for the PHP version in use or other outdated debugging-related extensions.
The behavior you see on XenForo.com, for example, is a different issue. It's down to how PHP behaves when you send data longer than post_max_size (regardless of the upload_max_size value). PHP truncates the response, which causes various oddities to happen. In this case, returning HTML content instead of JSON. The error is about the missing CSRF token so it's not actually particularly useful. This is a value that can only be changed before PHP starts up. I'm not sure what can be done in this case, though I will look.
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