Why Are My Go Web Server POST Requests Being Redirected to GET Requests?

Go Web Server Automatically Redirecting POST Requests

When encountering the frustrating issue of POST requests being redirected to GET requests in a Go web server, the cause lies in a subtle detail: the trailing slash in the registered path.

By default, the HTTP ServeMux implementation performs a redirect when a request is received for a subtree root without a trailing slash. If your handler is registered with /myurl/ but the request is sent to /myurl, the server responds with a 301 redirect to the correct path.

Solution:

Addressing this behavior involves one of the following approaches:

• Direct browser to the correct URL: Ensure that the browser is directed to /myurl/ with the trailing slash included.
• Register handler only to the specific path: Handle requests for /myurl separately by registering the handler to /myurl.
• Register both paths: Register the handler to both /myurl and /myurl/, allowing either path to trigger the desired action without redirection.

Additional Notes:

• Redirected POST requests will result in a GET request being sent by the browser, not another POST request.
• For security reasons, browsers do not automatically resend POST data when redirected.
• Explore the resources provided in the original response for further insights into this behavior.

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