Why Does My Go Web Server Redirect POST Requests to `/myurl` to `/myurl/`?

Go Web Server: Mysterious Redirect on POST Requests

When making POST requests to a specific URL (/myurl), developers encounter an unexpected behavior: the request does not reach the server directly. Instead, a 301 redirect response is received, followed by a secondary GET request that is handled by the server.

Upon investigating the server code, it appears that a handler for the "/myurl/" path is registered via http.HandleFunc("/myurl/", PHandler). However, when the browser makes the POST request, it directs to "/myurl" (without the trailing slash).

The key to understanding this issue lies in the default behavior of the http package in Go. According to the documentation for type http.ServeMux, a trailing slash on the registered path triggers a redirect if the request arrives without the trailing slash. This is intended to ensure that requests are routed to the appropriate handler.

In this case, since the handler is registered for "/myurl/", the browser's request to "/myurl" without the trailing slash results in a redirect to "/myurl/" with the trailing slash. This explains the observation that the request never hits the server directly.

To resolve this issue, developers have several options:

1. Direct the browser to the correct path with the trailing slash "/myurl/".
2. Register the handler only for the specific path without the trailing slash, such as http.HandleFunc("/myurl", PHandler).
3. Register handlers for both paths, allowing for requests with and without the trailing slash.

By implementing one of these solutions, developers can eliminate the unexpected redirect behavior and ensure that POST requests are handled as expected by their Go web server.

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