Incorrect MIME type

An incorrect MIME type error arises when a web server returns a file or resource with a Content-Type HTTP header that doesn’t match its actual content format. For instance, delivering JavaScript files with a non-JavaScript MIME type (e.g., text/html instead of application/javascript) can trigger browser warnings or block execution entirely. Browsers rely on accurate MIME types to handle and display resources correctly. Mismatches, often called MIME type mismatches, can prevent resources like scripts, CSS, images, or other assets from loading properly, impacting user experience and site functionality.

To resolve incorrect MIME type errors, first verify the resource’s HTTP response headers using browser developer tools or network inspection utilities. Ensure that your web server is correctly configured to serve resources with the appropriate Content-Type header. For example, JavaScript files should be served with Content-Type: application/javascript. If misconfigured, update your web server’s configuration files or settings (like .htaccess on Apache servers or MIME type definitions in server configurations) to match file extensions to correct MIME types. Regularly testing and validating HTTP headers can help prevent MIME type mismatches, ensuring smoother resource loading and better compatibility across browsers.