fix: Support HttpClient implementation for HyperClient with custom connectors (#3057)

Author: palindrom615

opentelemetry-http/CHANGELOG.md

@@ -3,6 +3,7 @@
 ## vNext
 
 - Implementation of `Extractor::get_all` for `HeaderExtractor`
+- Support `HttpClient` implementation for `HyperClient<C>` with custom connectors beyond `HttpConnector`, enabling Unix Domain Socket connections and other custom transports
 
 ## 0.30.0
 

opentelemetry-http/src/lib.rs

@@ -179,7 +179,11 @@ pub mod hyper {
     }
 
     #[async_trait]
-    impl HttpClient for HyperClient {
+    impl<C> HttpClient for HyperClient<C>
+    where
+        C: Connect + Clone + Send + Sync + 'static,
+        HyperClient<C>: Debug,
+    {
         async fn send_bytes(&self, request: Request<Bytes>) -> Result<Response<Bytes>, HttpError> {
             otel_debug!(name: "HyperClient.Send");
             let (parts, body) = request.into_parts();