Is it the crossorigin attribute that cannot load CDN resources in the production environment?

The production environment failed to load CDN resources: crossorigin attribute doubt cloud

In front-end development, we often use CDN to introduce external JavaScript libraries, such as nprogress.js progress bar library. However, some developers encounter a problem: the development and testing environment is normal, but the production environment cannot load the library. The code example is as follows:

 // Code example (assuming there is code here, but the original text is not provided)

Despite using crossorigin="anonymous" property, the production environment still fails to load the resource. This prompts us to reexamine the crossorigin properties and potential problems with the production environment.

crossorigin="anonymous" property declares that the script comes from different domains and allows the browser to send CORS request headers, which is crucial for cross-domain access to resources. But the premise is that CORS is correctly configured on the server side. If the server does not configure CORS correctly, the request will be intercepted by the browser even if the client sets the crossorigin property.

However, if the code only calls start and done methods of the nprogress library and does not perform other cross-domain operations, crossorigin="anonymous" property appears redundant and may even cause problems.

The problem may be with the security policies of the production environment, such as CSP (Content Security Policy) blocking access to scripts, or the server CORS configuration is incorrect.

Solution:

It is recommended to remove crossorigin="anonymous" attribute first. If the code does not require cross-domain access, this property only adds unnecessary complexity and may conflict with the security policy of the production environment. After removal, observe whether the problem is resolved. If the problem persists, you need to check the server configuration of the production environment, especially the CORS and CSP policies.

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