Allow non-destructive access to a request/payload of a ServiceRequest

[andy128k]

Expected Behavior

Expose references (mutable references) to a request and a payload of a ServiceRequest.

Current Behavior

ServiceRequest allows to get a request and a payload by invoking into_parts method. But this method consumes a ServiceRequest.

Possible Solution

1. Add getters (mutable getters).
2. Make fields public.

Context

A middleware may have a need to access a request (or a payload) by a borrowed reference to A ServiceRequest.
Related issues: #2168 #1821

[ilyvion]

I really don't understand why it was decided to only add a parts_mut and not also a parts. I'm in a situation where I have a &ServiceRequest and I can't find any (non-UB) way of getting a hold of the inner &HttpRequest.

[aliemjay]

I really don't understand why it was decided to only add a parts_mut and not also a parts. I'm in a situation where I have a &ServiceRequest and I can't find any (non-UB) way of getting a hold of the inner &HttpRequest.

This quite reasonable. Please consider opening another issue that covers ServiceResponse as well.