Add Uri to tonic::Request

[shikhar]

Feature Request

Crates

tonic

Motivation

A gRPC service may be accessible at multiple endpoints and knowing the hostname can be meaningful.

With HTTP1.1 this is usually available as the Host header and could have been accessed from the MetadataMap, but given the HTTP/2 context the right way to access this is the authority pseudoheader from the URI.

https://docs.rs/http/latest/http/request/struct.Request.html#method.uri
https://docs.rs/http/latest/http/uri/struct.Uri.html#method.authority

However, this is not currently available to tonic services.

Proposal

Add a uri: Uri field to tonic::Request and a getter for it. This field should be copied over from the http::Request.

Alternatives

A layer that adds the URI or required components (e.g. request.uri().authority()) as an extension.

[shikhar]

Had a go at plumbing this up, and it's not pretty. Another solution could be to add the Uri as an extension (by default, can be done by a custom layer already of course)...