Introduce JettyClientHttpRequestFactory

This commit introduces an implementation of ClientHttpRequestFactory
based on Jetty's HttpClient.

Closes gh-30564

spring-web/src/test/java/org/springframework/http/client/AbstractHttpRequestFactoryTests.java

@@ -111,20 +111,19 @@ abstract class AbstractHttpRequestFactoryTests extends AbstractMockWebServerTest
 		ClientHttpRequest request = factory.createRequest(URI.create(baseUrl + "/echo"), HttpMethod.POST);
 
 		final byte[] body = "Hello World".getBytes(StandardCharsets.UTF_8);
+		request.getHeaders().setContentLength(body.length);
 		if (request instanceof StreamingHttpOutputMessage streamingRequest) {
-			streamingRequest.setBody(outputStream -> {
-				StreamUtils.copy(body, outputStream);
-				outputStream.flush();
-				outputStream.close();
-			});
+			streamingRequest.setBody(outputStream -> StreamUtils.copy(body, outputStream));
 		}
 		else {
 			StreamUtils.copy(body, request.getBody());
 		}
 
-		request.execute();
-		assertThatIllegalStateException().isThrownBy(() ->
-				FileCopyUtils.copy(body, request.getBody()));
+		try (ClientHttpResponse response = request.execute()) {
+			assertThatIllegalStateException().isThrownBy(() ->
+					FileCopyUtils.copy(body, request.getBody()));
+			assertThat(response.getStatusCode()).as("Invalid status code").isEqualTo(HttpStatus.OK);
+		}
 	}
 
 	@Test

spring-web/src/test/java/org/springframework/http/client/JettyClientHttpRequestFactoryTests.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2002-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.client;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.http.HttpMethod;
+
+/**
+ * @author Arjen Poutsma
+ */
+public class JettyClientHttpRequestFactoryTests extends AbstractHttpRequestFactoryTests {
+
+	@Override
+	protected ClientHttpRequestFactory createRequestFactory() {
+		return new JettyClientHttpRequestFactory();
+	}
+
+	@Override
+	@Test
+	public void httpMethods() throws Exception {
+		super.httpMethods();
+		assertHttpMethod("patch", HttpMethod.PATCH);
+	}
+
+}

spring-web/src/test/java/org/springframework/web/client/RestTemplateIntegrationTests.java

@@ -48,6 +48,7 @@ import org.springframework.http.RequestEntity;
 import org.springframework.http.ResponseEntity;
 import org.springframework.http.client.ClientHttpRequestFactory;
 import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
+import org.springframework.http.client.JettyClientHttpRequestFactory;
 import org.springframework.http.client.OkHttp3ClientHttpRequestFactory;
 import org.springframework.http.client.SimpleClientHttpRequestFactory;
 import org.springframework.http.converter.FormHttpMessageConverter;
@@ -88,12 +89,12 @@ class RestTemplateIntegrationTests extends AbstractMockWebServerTests {
 	@interface ParameterizedRestTemplateTest {
 	}
 
-	@SuppressWarnings("deprecation")
 	static Stream<Named<ClientHttpRequestFactory>> clientHttpRequestFactories() {
 		return Stream.of(
 			named("JDK", new SimpleClientHttpRequestFactory()),
 			named("HttpComponents", new HttpComponentsClientHttpRequestFactory()),
-			named("OkHttp", new OkHttp3ClientHttpRequestFactory())
+			named("OkHttp", new OkHttp3ClientHttpRequestFactory()),
+			named("Jetty", new JettyClientHttpRequestFactory())
 		);
 	}