feat: add notion of pre and post hooks around error response generation

vapor-ware / fastapi-rfc7807

RFC-7807 compliant problem detail error response handler for FastAPI applications

GNU General Public License v3.0

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Closed edaniszewski closed 4 years ago

edaniszewski commented 4 years ago

This PR:

adds "post" hooks and differentiates them from the existing "pre" hooks.
post hooks are added here as a convenience to allow things to modify the response as needed prior to sending the response. there may be other ways to do this, but it seems like based on the way that fastapi/starlette orders and executes middleware, this is the place in the chain where it would need to happen.