Support OkHttp as (Async)ClientHttpRequestFactory

This commit introduces support for OkHttp
(http://square.github.io/okhttp/) as a backing implementation for
ClientHttpRequestFactory and AsyncClientHttpRequestFactory.

Issue: SPR-12893

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

@@ -37,6 +37,7 @@ public class BufferedSimpleAsyncHttpRequestFactoryTests extends AbstractAsyncHtt
 	@Override
 	@Test
 	public void httpMethods() throws Exception {
+		super.httpMethods();
 		try {
 			assertHttpMethod("patch", HttpMethod.PATCH);
 		}

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

@@ -34,6 +34,7 @@ public class HttpComponentsAsyncClientHttpRequestFactoryTests extends AbstractAs
 	@Override
 	@Test
 	public void httpMethods() throws Exception {
+		super.httpMethods();
 		assertHttpMethod("patch", HttpMethod.PATCH);
 	}
 

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

@@ -45,6 +45,7 @@ public class HttpComponentsClientHttpRequestFactoryTests extends AbstractHttpReq
 	@Override
 	@Test
 	public void httpMethods() throws Exception {
+		super.httpMethods();
 		assertHttpMethod("patch", HttpMethod.PATCH);
 	}
 

spring-web/src/test/java/org/springframework/http/client/Netty4AsyncClientHttpRequestFactoryTests.java

@@ -50,6 +50,7 @@ public class Netty4AsyncClientHttpRequestFactoryTests extends AbstractAsyncHttpR
 	@Override
 	@Test
 	public void httpMethods() throws Exception {
+		super.httpMethods();
 		assertHttpMethod("patch", HttpMethod.PATCH);
 	}
 

spring-web/src/test/java/org/springframework/http/client/Netty4ClientHttpRequestFactoryTests.java

@@ -50,6 +50,7 @@ public class Netty4ClientHttpRequestFactoryTests extends AbstractHttpRequestFact
 	@Override
 	@Test
 	public void httpMethods() throws Exception {
+		super.httpMethods();
 		assertHttpMethod("patch", HttpMethod.PATCH);
 	}
 

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

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2002-2015 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
+ *
+ *      http://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 com.squareup.okhttp.OkHttpClient;
+import org.junit.Test;
+import org.springframework.http.HttpMethod;
+
+/**
+ * @author Luciano Leggieri
+ */
+public class OkHttpAsyncClientHttpRequestFactoryTests extends AbstractAsyncHttpRequestFactoryTestCase {
+    
+    @Override
+    protected AsyncClientHttpRequestFactory createRequestFactory() {
+        return new OkHttpClientHttpRequestFactory();
+    }
+
+    @Override
+    @Test
+    public void httpMethods() throws Exception {
+        super.httpMethods();
+        assertHttpMethod("patch", HttpMethod.PATCH);
+    }
+
+}

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

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2002-2015 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
+ *
+ *      http://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 com.squareup.okhttp.OkHttpClient;
+import org.junit.Test;
+import org.springframework.http.HttpMethod;
+
+/**
+ * @author Luciano Leggieri
+ */
+public class OkHttpClientHttpRequestFactoryTests extends AbstractHttpRequestFactoryTestCase {
+
+	@Override
+	protected ClientHttpRequestFactory createRequestFactory() {
+		return new OkHttpClientHttpRequestFactory();
+	}
+
+	@Override
+	@Test
+	public void httpMethods() throws Exception {
+		assertHttpMethod("patch", HttpMethod.PATCH);
+	}
+
+}