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A CSS file fails to load with a "CORS policy" error. How to troubleshoot this issue?

Revati S Misra11601-Aug-2023

A CSS file fails to load with a "CORS policy" error. How to troubleshoot this issue?

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Updated on 02-Aug-2023
Revati S Misra

Revati S Misra

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Aryan Kumar

Aryan Kumar

02-Aug-2023

A CORS policy error occurs when a web browser prevents a request from being made to a resource from a different origin. This is done to prevent cross-site scripting (XSS) attacks.

If you are getting a CORS policy error when trying to load a CSS file, there are a few things you can do to troubleshoot the issue:

  1. Check the origin of the CSS file. The first step is to check the origin of the CSS file. The origin is the domain name and port of the server that the CSS file is hosted on. If the origin of the CSS file is different from the origin of the website that you are on, then you will need to allow cross-origin requests.
  2. Allow cross-origin requests. If you are the owner of the website, you can allow cross-origin requests by adding the Access-Control-Allow-Origin header to the response. The value of the header should be the origin of the CSS file that you want to allow requests from.
  3. Use a CORS proxy. If you are not the owner of the website, you can use a CORS proxy. A CORS proxy is a server that acts as an intermediary between your browser and the remote server. The proxy can be configured to allow cross-origin requests.

Here are some additional tips for troubleshooting CORS policy errors:

  • Use a CORS tester. There are a number of CORS testers available online that can help you to troubleshoot CORS policy errors. These tools will send a request to the CSS file and then tell you if the request was successful.
  • Use a different browser. Sometimes, the problem can be caused by a bug in the browser. You can try using a different browser to see if that works.
  • Contact the website administrator. If you have tried all of the above and you are still getting CORS policy errors, you can contact the website administrator for assistance. The administrator may be able to help you to determine why the CSS file is not being loaded.

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