Debug the SpringBoot backend, after the client request is sent, an error message is reported in the background: Request method'POST' not supported
Strange, this module is copied from an existing module, why can it be wrong?
Double-checked, it's not the setting of POST itself.
It turns out that there is extra content in the request path:
Just remove the extra backslashes.
But this error message is weird, making people mistakenly think that it is a problem with POST/GET request type settings.
problem solved.