Feature request: before/after request methods

[upcFrost]

Hi,

It'd be really cool to support overridable methods called before and after the request (useful for logging and setting the request context), similar to flask before_request decorator. For myself I've implemented those using functools.partial wrapped around the handler inside the __mapping__ call override, but it'd be great to have a standard way of doing it

[vmagamedov]

Currently you can override a call or track beginning of a request using RecvRequest event

[upcFrost]

Interesting, thank you, I'll try using it. Though it's a bit painful that events should be mapped to the server and not to the handler class (those are in two different modules)