Implement MethodNotAllowedHandler

[alexweissman]

Right now we rely on Slim's default NotAllowed handler for dealing with MethodNotAllowedException (405 errors). This sucks because it is stylistically inconsistent and diverges from our generic/debug exception handling system.

We should do a passthrough in Slim's notAllowedHandler, just like we have now done with phpErrorHandler and notFoundHandler, to throw our own MethodNotAllowedException and process it with one of our exception handlers (HttpExceptionHandler or a subtype).

However since the default handler can already return multiple different content types, I recommend we resolve #783 first, before attempting to resolve this issue.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[alexweissman]

Still an issue

[lcharette]

FYI, as of https://github.com/userfrosting/sprinkle-core/commit/5c6f47cb5db67a6d0972815e86dd853d9e3fc1a4, MethodNotAllowedException is properly handled by UF Error Handler in V5.