fix(web): Fix enable and update docs (#1326)

* fix(web): Fix `enable` and update docs

* fix example, update deny

* fix namedservice path

examples/src/grpc-web/server.rs

@@ -2,8 +2,6 @@ use tonic::{transport::Server, Request, Response, Status};
 
 use hello_world::greeter_server::{Greeter, GreeterServer};
 use hello_world::{HelloReply, HelloRequest};
-use tonic_web::GrpcWebLayer;
-use tower_http::cors::CorsLayer;
 
 pub mod hello_world {
     tonic::include_proto!("helloworld");
@@ -41,13 +39,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     Server::builder()
         // GrpcWeb is over http1 so we must enable it.
         .accept_http1(true)
-        // Use the Cors layer from `tower-http`.
-        .layer(CorsLayer::new())
-        // Apply the tonic-web layer to convert
-        // http1 requests into something that
-        // the core tonic code can understand.
-        .layer(GrpcWebLayer::new())
-        .add_service(greeter)
+        .add_service(tonic_web::enable(greeter))
         .serve(addr)
         .await?;