Why can't I get the content using `fetch`

The article explains the Cross-Origin Resource Sharing (CORS) policy, which affects requests made from different origins. When a web application tries to fetch resources from an external server, it must have permission from that server to avoid CORS errors. In this case, the browser blocked a request because the server's response lacked the 'Access-Control-Allow-Origin' header needed to indicate that it allows requests from the origin making the call. Solutions include configuring the server to allow the origin or using workarounds during development, but these should be approached cautiously.

CORS (Cross-Origin Resource Sharing) is a security feature implemented by web browsers to protect users from cross-origin requests. When a web application attempts to request resources from a different origin, it needs permission from the server. If the server does not include the proper 'Access-Control-Allow-Origin' header in its response, the browser will block the request, leading to the error you encountered. CORS issues are common when developing with local servers and accessing APIs from different domains.

The 'Access-Control-Allow-Origin' header is essential for enabling web applications to make requests to servers hosted on different origins. By specifying which origins are allowed to access the resource, servers can restrict potentially harmful interactions and ensure that only trusted domains can access their data. If you control the server, you can enable CORS by configuring the server to include this header with the appropriate value, allowing the requests from your application.

When working in a development environment, you might encounter CORS issues frequently, especially when trying to access APIs from local servers. To mitigate this during development, you can either configure your server to allow requests from your local origin or use tools like proxies or browser extensions that bypass CORS restrictions. However, these methods are not suitable for production and should only be used with caution in a controlled setting.

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