Borrow from request body in FromRequest impl

[Ddystopia]

Hello, is there any way to express that I want to borrow from request body in FromRequest trait implementation? For example, getting &str instead of heapless::String in example.

[sammhicks]

I unfortunately ran into lifetime problems when I tried to add support for FromRequest borrowing data from the HTTP request. It's on my desired feature list, but I'm not sure that it's feasible.

[sammhicks]

I might have a solution, currently in the development branch.
Although function handlers cannot borrow from requests, I've created helper macros to allow RequestHandlerService and PathRouterService to borrow from requests.