Description

Ensure only `req` param is passed because [_reasons_](https://github.com/denoland/deno/blob/f270e41/ext/http/00_serve.ts#L796-L800) and allow passing optional `thisArg`to enable easier support of unbound fetch handlers (e.g. https://www.val.town/v/vladimyr/pekoExample?v=4#L8)