How to Test CORS Configuration
Step-by-step guide to checking whether an API endpoint is configured to allow cross-origin requests using the DevHexLab CORS Tester.
Tool Used
CORS Header Tester
1
Open the CORS Tester
Navigate to /tools/network/cors-tester.
2
Enter the API URL
Type the full URL of the API endpoint you want to test for CORS support.
3
Set the origin
Enter the origin URL that would be making the cross-origin request (for example, https://yourfrontend.com). The tool sends a preflight OPTIONS request from this origin.
4
Read the result
The tool shows whether the server returns the correct Access-Control-Allow-Origin header and whether the preflight request succeeds.
All done!
You are ready to use CORS Header Tester like a pro.