Description

This PR fixes #1044 builds on the earlier "Fix mypy warnings in router.py" #1038

Summary

This PR refactors def _format_response(self, res: Union[Dict, Response, bytes, tuple, str]) -> Response to reduce nesting and remove the two complicated formats to other functions _format_dict_response and _format_tuple_response

All tests pass (but I want to add unit tests to confirm more examples without needing a running server).

This should resolve these comments from @sansyrox : #1038 (comment) and #1038 (comment)

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