dacut/hypertraits.md

## hypertraits.md

      
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              hypertraits.md
            
          
    Hyper wants services to implement the HttpService trait, and service makers to implement the MakeServiceRef trait. These aren't exposed outside of Hyper, however.
If we could use the HttpService trait, this is what it looks like to wrap another service:
struct WrappingService<S> {
    wrapped: S,
}

impl<S> HttpService<Body> for WrappingService<S>
where
    S: HttpService<Body, ResBody=Body, Error=Box<dyn Error + Send + Sync + 'static>>,
{
    type ResBody = Body;
    type Error = S::Error;
    type Future = S::Future;
    
    fn poll_ready(&mut self, c: &mut Context) -> Poll<Result<(), S::Error>> {
        self.s.poll_ready(c)
    }
    
    fn call(&mut self, req: Request<Body>) -> Self::Future {
        ...
        self.s.call(req)
    }
}