Make sure we can capture the host header in HTTP1 and HTTP2.

ext/hyper_ruby/src/lib.rs

@@ -608,6 +608,7 @@ fn init(ruby: &Ruby) -> Result<(), MagnusError> {
     request_class.define_method("path", method!(Request::path, 0))?;
     request_class.define_method("query_params", method!(Request::query_params, 0))?;
     request_class.define_method("query_param", method!(Request::query_param, 1))?;
+    request_class.define_method("host", method!(Request::host, 0))?;
     request_class.define_method("header", method!(Request::header, 1))?;
     request_class.define_method("headers", method!(Request::headers, 0))?;
     request_class.define_method("body", method!(Request::body, 0))?;

ext/hyper_ruby/src/request.rs

@@ -105,6 +105,20 @@ impl Request {
         RString::new(self.request.uri().path())
     }
 
+    pub fn host(&self) -> Value {
+        match self.request.uri().host() {
+            Some(host) => RString::new(host).as_value(),
+            // Fallback to Host header if no host in URI object
+            None => match self.request.headers().get("Host") {
+                Some(value) => match value.to_str() {
+                    Ok(value) => RString::new(value).as_value(),
+                    Err(_) => qnil().as_value(),
+                },
+                None => qnil().as_value(),
+            }
+        }
+    }
+
     pub fn query_params(&self) -> RHash {
         let params = RHash::new();
         if let Some(query) = self.request.uri().query() {

test/test_http.rb

@@ -241,6 +241,35 @@ def test_query_params_with_encoding
     end
   end
 
+  def test_host
+    with_server(-> (request) { handler_return_host(request) }) do |client|
+      response = client.get("/")
+      assert_equal 200, response.status
+      # The Host header should contain the server address
+      host_header = JSON.parse(response.body)["message"]
+      assert_match(/127\.0\.0\.1/, host_header)
+    end
+  end
+
+  def test_http2_host
+    with_server(-> (request) { handler_return_host(request) }) do |client|
+      # Configure client for HTTP/2
+      client = client.with(
+        debug: STDERR,
+        debug_level: 3,
+        fallback_protocol: "h2"
+      )
+
+      response = client.get("/")
+      assert_equal 200, response.status
+      assert_equal "2.0", response.version
+
+      # The Host header should contain the server address
+      host_header = JSON.parse(response.body)["message"]
+      assert_match(/127\.0\.0\.1/, host_header)
+    end
+  end
+
   private
 
   def handler_simple(request)
@@ -256,6 +285,10 @@ def handler_return_header(request, header_key)
     HyperRuby::Response.new(200, { 'Content-Type' => 'application/json' }, { message: request.header(header_key) }.to_json)
   end
 
+  def handler_return_host(request)
+    HyperRuby::Response.new(200, { 'Content-Type' => 'application/json' }, { message: request.host() }.to_json)
+  end
+
   def handler_return_all_headers(request)
     HyperRuby::Response.new(200, { 'Content-Type' => 'application/json' }, { headers: request.headers }.to_json)
   end