Troubleshooting a CORS problem encountered in Angular 6 when making API calls

Browser security protocols are preventing access to '' from 'http://localhost:4200' due to CORS policy blocking. The requested resource lacks an 'Access-Control-Allow-Origin' header. If a non-transparent response is acceptable, adjust the request mode to 'no-cors' to fetch without CORS.

This error was encountered in the console, even though CORS has been enabled for other API requests in the WEB API.

Service:

 ViewPDF(mMagazineId){
    return this.http.get(this.BASE_URL + `/api/ViewPDF/?mMagazineId=${mMagazineId}`);
  }

WebApiConfig.cs

 config.EnableCors(new EnableCorsAttribute("*", headers: "*", methods: "*"));

This issue is causing confusion for me. Any assistance in resolving it would be greatly appreciated.

angulartypescriptasp.net-web-apiangular6

Answer №1

To enable CORS, consider modifying your server properties if possible. Learn how to do it here.

If you are unable to change server properties, you may attempt calling the API using JSONP instead of traditional JSON. However, this method is not as straightforward and may still be restricted by the server.

Answer №2

Ensure that the backend entity attribute matches precisely with the JSON model being transferred from Angular, taking into account even the slightest variations in letter case.

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