Why Does CodeIgniter Throw a \"Filetype Not Allowed\" Error Even When the File Type is Allowed?

Troubleshooting "Filetype Not Allowed" Error in CodeIgniter File Uploads

When attempting to upload files in CodeIgniter, it's common to encounter the error "The filetype you are attempting to upload is not allowed." This error can be frustrating, especially when the specified file type is included in the allowed types configuration.

To begin troubleshooting, check if the uploaded file's extension is interpreted correctly. In the given code example, the MIME type is being misinterpreted for files other than AVI.

One potential cause of this issue is Firefox. In such cases, try the following:

<code class="php">$this->_file_mime_type($_FILES[$field]); var_dump($this->file_type); die();</code>

Add this code to the Upload.php file on line 199 to display the MIME type of the uploaded file. If it doesn't match the expected type, add it to the mimes.php configuration file.

Another possible cause is a corrupted MIME type, which can occur in Firefox. Consider disabling MIME sniffing in the browser or using a plugin such as "Get MIME Type" to resolve issues with file type identification.

If the issue persists, it's advisable to check if it occurs on different machines. If uploads work on some machines but not on others, it indicates potential browser or server issues.

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