POST can be redirected to GET with a 303 See Other response per RFC 7231, 6.4.4. Reading through the 3xx response definitions and notes you can find out when a client may change the request method and how to prevent that.
All the other rewrites not involving URL redirection are internal and happens during the same request. Those won't invoke other requests at all which makes changing the method impossible.
POSTcan be redirected toGETwith a303 See Otherresponse per RFC 7231, 6.4.4. Reading through the3xxresponse definitions and notes you can find out when a client may change the request method and how to prevent that.All the other rewrites not involving URL redirection are internal and happens during the same request. Those won't invoke other requests at all which makes changing the method impossible.