In this article, we can set up HAProxy to accept preflight options for CORS. At Bobcares, with our Server Management Service, we can handle your HAProxy issues.

Setup HAProxy to Accept Preflight for CORS

We must provide the proper response headers in the backend server’s answers in order for HAProxy to be configured to accept Preflight (OPTIONS) requests for CORS support. Here is the appropriate setup:

1. Modification of HAProxy Configuration File:

Initially, use a text editor with administrative rights to access the HAProxy configuration file, which is normally found at /etc/haproxy/haproxy.cfg.

2. Include CORS Headers for Preflight Requests:

Then, we must provide the required CORS headers in the responses from the backend server for HAProxy to be able to perform Preflight requests. For instance, Access-Control-Allow-Headers, Access-Control-Allow-Methods, Access-Control-Allow-Origin, and Access-Control-Max-Age are some of these headers.

3. HAProxy Restart:

Lastly, save the configuration file after making the necessary changes, then restart HAProxy for the changes to take effect:

For Example:

Preflight requests can be properly handled because the aforementioned example sets the proper CORS headers in the backend server’s response.

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Conclusion

By following these steps, HAProxy will be correctly set up to handle Preflight (OPTIONS) requests and respond with the right CORS headers, enabling cross-origin requests from web browsers to work as intended.