Go Gin Framework: Why Does My CORS Middleware Return a 200 OK on OPTIONS Requests, and How Can I Fix It?

Go Gin Framework: Resolving CORS Issues During OPTIONS Requests

When utilizing the Go Gin framework for API development, enabling Cross-Origin Resource Sharing (CORS) ensures seamless communication between clients and the server. A middleware function is commonly used to handle CORS configuration.

One such middleware function is provided in the question. However, users may encounter a "Status Code:200 OK" but no further action after OPTIONS requests. This typically indicates a missing configuration or an issue in the middleware implementation.

To help resolve this issue, a modified middleware function is suggested in the answer. Key differences include:

• An additional header is set for "Access-Control-Allow-Methods": The purpose of this header is to specify the allowed HTTP methods for the request (e.g., POST, GET, OPTIONS, etc.).
• An "AbortWithStatus": A status code of 204 (No Content) is sent for OPTIONS requests, which is the recommended practice.

By incorporating these changes, the middleware function effectively handles CORS for the OPTIONS request and allows the appropriate status code to be returned. Implementing this modified middleware should eliminate the "Status Code:200 OK" issue and ensure proper behavior during OPTIONS requests.

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