feat: support grpc-web and add web feature

Signed-off-by: hi-rustin <rustin.liu@gmail.com>

console-subscriber/Cargo.toml

@@ -28,6 +28,7 @@ keywords = [
 default = ["env-filter"]
 parking_lot = ["parking_lot_crate", "tracing-subscriber/parking_lot"]
 env-filter = ["tracing-subscriber/env-filter"]
+web = ["tonic-web"]
 
 [dependencies]
 
@@ -53,6 +54,9 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 crossbeam-channel = "0.5"
 
+# Only for the web feature:
+tonic-web = { version = "0.10.2", optional = true }
+
 [dev-dependencies]
 tokio = { version = "^1.21", features = ["full", "rt-multi-thread"] }
 tower = { version = "0.4", default-features = false }
@@ -61,3 +65,7 @@ futures = "0.3"
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
+
+[[example]]
+name = "app"
+required-features = ["web"]

console-subscriber/src/lib.rs

@@ -922,7 +922,7 @@ impl Server {
     /// ```
     /// [`serve_with`]: Server::serve_with
     pub async fn serve(self) -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>> {
-        self.serve_with(tonic::transport::Server::default()).await
+        self.serve_with(tonic::transport::Server::builder()).await
     }
 
     /// Starts the gRPC service with the given [`tonic`] gRPC transport server
@@ -937,14 +937,20 @@ impl Server {
     /// [`tonic`]: https://docs.rs/tonic/
     pub async fn serve_with(
         self,
-        mut builder: tonic::transport::Server,
+        #[cfg(feature = "web")] builder: tonic::transport::Server,
+        #[cfg(not(feature = "web"))] mut builder: tonic::transport::Server,
     ) -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>> {
         let addr = self.addr.clone();
         let ServerParts {
             instrument_server,
             aggregator,
         } = self.into_parts();
         let aggregate = spawn_named(aggregator.run(), "console::aggregate");
+        #[cfg(feature = "web")]
+        let router = builder
+            .accept_http1(true)
+            .add_service(tonic_web::enable(instrument_server));
+        #[cfg(not(feature = "web"))]
         let router = builder.add_service(instrument_server);
         let res = match addr {
             ServerAddr::Tcp(addr) => {