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Our application supports CORS configurations headers. I have configured testApp separately on two different hosts. Both the setups work independent of each other. Application on host1 is configured with CORS header Access-Control-Allow-Origin to pointing to application on host2. When I access the application pages of host2 am expecting it to show Access-Control-Allow-Origin header in response. But which is missing.
How to test to CORS headers to confirm its working properly or coded properly to support cross domain resource sharing.
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You can either send the CORS request to a remote server (to test if CORS is supported), or send the CORS request to a test server (to explore certain features of CORS). Send feedback or browse the source here: https://github.com/monsur/test-cors.org.
The CORS request requires that the server permit the use of credentials, but the server's Access-Control-Allow-Credentials header's value isn't set to true to enable their use. To fix this problem on the client side, revise the code to not request the use of credentials.
Cross-origin requests have an origin header that identifies the domain initiating the request and is always sent to the server. CORS defines the protocol to use between a web browser and a server to determine whether a cross-origin request is allowed. HTTP headers are used to accomplish this.
Test CORS is a web app to tell you whether cross-origin resource sharing is allowed in your browser or not. It simply fetched the "example.com" page from the current domain with several XMLHttpRequest methods and checks whether the fetch request has been successful or not.
If your application returns the header: Access-Control-Allow-Origin then it should work. In my particular use case I set it to "*".
Otherwise testing will show an error, viewable from a browser console. It will say something like: Access to ... has been blocked by CORS policy
You can test if the CORS headers are working properly using your browser. I used this one and hope this helps. You will find the instructions in it. https://github.com/cactuz/cors-tester-from-browser
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You could test it with cUrl from terminal.
curl -v --request OPTIONS **'localhost:3000'** --header 'Origin: **http://some.origin.here**'; --header 'Access-Control-Request-Method: GET'
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