CORS setup for grpc-web doesn't compile

[pvva]

Bug Report

Version

0.5.0

Platform

Windows / Linux

Crates

tonic = "0.10.2"
tonic-web = "0.10.2"
tower-http = { version = "0.5.0", features = ["cors"] }

Description

I was playing around with the code from https://github.com/hyperium/tonic/blob/master/examples/src/grpc-web/server.rs.
I added a cors layer and grpc web layer with sample code given at https://docs.rs/tower-http/0.5.0/tower_http/cors/struct.CorsLayer.html.

use tonic_web::GrpcWebLayer;
use tower_http::cors::CorsLayer;

...

    let cors_layer = CorsLayer::new(); // add whatever origins, methods, headers
    Server::builder()
        // GrpcWeb is over http1 so we must enable it.
        .accept_http1(true)
        .layer(cors_layer)
        .layer(GrpcWebLayer::new())
        .add_service(greeter)
        .serve(addr)
        .await?;

And when it tries to compile I get this:

.serve(addr)
    |          ^^^^^ the trait `Service<http::request::Request<tonic::transport::Body>>` is not implemented for `Cors<GrpcWebService<Routes>>`
    |
    = help: the trait `Service<http::Request<ReqBody>>` is implemented for `Cors<S>`

I didn't find a workaround for this. I would appreciate any advice/help.

[jplatte]

tonic 0.10.x uses http 0.2, while tower-http 0.5.x uses http 1.0. You have to downgrade tower-http to 0.4 or wait for tonic 0.11.