wasmtime-wasi-http: Only inject Host header in the default HTTP/1 send_request path (#13138)

Author: namse

crates/wasi-http/src/p2/http_impl.rs

@@ -64,8 +64,6 @@ impl outgoing_handler::Host for WasiHttpCtxView<'_> {
 
         let authority = req.authority.unwrap_or_else(String::new);
 
-        builder = builder.header(hyper::header::HOST, &authority);
-
         let mut uri = http::Uri::builder()
             .scheme(scheme)
             .authority(authority.clone());

crates/wasi-http/src/p2/mod.rs

@@ -582,6 +582,14 @@ pub async fn default_send_request_handler(
     use tokio::net::TcpStream;
     use tokio::time::timeout;
 
+    if !request.headers().contains_key(hyper::header::HOST) {
+        if let Some(authority) = request.uri().authority() {
+            if let Ok(value) = hyper::header::HeaderValue::from_str(authority.as_str()) {
+                request.headers_mut().insert(hyper::header::HOST, value);
+            }
+        }
+    }
+
     let authority = if let Some(authority) = request.uri().authority() {
         if authority.port().is_some() {
             authority.to_string()