Why is the CORS policy blocking access to fetch in Blazor Client Web Assembly?

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The CORS policy is blocking access to fetch in Blazor Client Web Assembly in order to protect users' security and prevent unauthorized access to sensitive resources. CORS (Cross-Origin Resource Sharing) is a security measure implemented in web browsers to prevent certain types of web attacks, such as Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF).

When a web page attempts to access a resource from a different domain or origin, the browser checks the CORS policy to determine if the resource should be allowed. If the CORS policy is not properly configured, the browser will block the request, which can affect the functionality of web applications.

In the case of Blazor Client Web Assembly, the CORS policy may be blocking access to fetch because the server hosting the API or resource that the application is attempting to access is configured to only allow requests from certain domains or origins. To resolve this issue, the CORS policy on the server needs to be configured to allow requests from the domain or origin where the Blazor Client Web Assembly application is hosted.