Set entity contentLength for HttpClientRibbonCommand.

If the content length isn't set on the entity, when http client determines which header to set, it sets transfer-encoding to chunked rather than content-length.

This fixes a missing content-length issue when using `HttpClientRibbonCommandFactory`.

See gh-1042

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/ribbon/apache/RibbonApacheHttpRequest.java

@@ -37,6 +37,7 @@ import lombok.Getter;
 public class RibbonApacheHttpRequest extends ClientRequest implements Cloneable {
 
 	private final String method;
+	private Long contentLength;
 
 	private final MultiValueMap<String, String> headers;
 
@@ -44,11 +45,18 @@ public class RibbonApacheHttpRequest extends ClientRequest implements Cloneable
 
 	private final InputStream requestEntity;
 
+	public RibbonApacheHttpRequest(final String method, final URI uri,
+								   final Boolean retryable, final MultiValueMap<String, String> headers,
+								   final MultiValueMap<String, String> params, final InputStream requestEntity) {
+		this(method, uri, retryable, headers, params, requestEntity, null);
+	}
+
 	public RibbonApacheHttpRequest(final String method, final URI uri,
 			final Boolean retryable, final MultiValueMap<String, String> headers,
-			final MultiValueMap<String, String> params, final InputStream requestEntity) {
+			final MultiValueMap<String, String> params, final InputStream requestEntity, Long contentLength) {
 
 		this.method = method;
+		this.contentLength = contentLength;
 		this.uri = uri;
 		this.isRetriable = retryable;
 		this.headers = headers;
@@ -77,6 +85,11 @@ public class RibbonApacheHttpRequest extends ClientRequest implements Cloneable
 			final BasicHttpEntity entity;
 			entity = new BasicHttpEntity();
 			entity.setContent(this.requestEntity);
+			// if the entity contentLength isn't set, transfer-encoding will be set
+			// to chunked in org.apache.http.protocol.RequestContent. See gh-1042
+			if (contentLength != null) {
+				entity.setContentLength(this.contentLength);
+			}
 			builder.setEntity(entity);
 		}
 

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/zuul/filters/route/apache/HttpClientRibbonCommand.java

@@ -35,6 +35,7 @@ import com.netflix.hystrix.HystrixCommandKey;
 import com.netflix.hystrix.HystrixCommandProperties;
 import com.netflix.zuul.constants.ZuulConstants;
 import com.netflix.zuul.context.RequestContext;
+import org.springframework.util.StringUtils;
 
 /**
  * @author Christian Lohmann
@@ -100,10 +101,15 @@ public class HttpClientRibbonCommand extends HystrixCommand<ClientHttpResponse>
 
 	protected ClientHttpResponse forward() throws Exception {
 		final RequestContext context = RequestContext.getCurrentContext();
+		Long contentLength = null;
+		String contentLengthHeader = context.getRequest().getHeader("Content-Length");
+		if (StringUtils.hasText(contentLengthHeader)) {
+			contentLength = new Long(contentLengthHeader);
+		}
 		URI uriInstance = new URI(this.uri);
 		RibbonApacheHttpRequest request = new RibbonApacheHttpRequest(this.method,
 				uriInstance, this.retryable, this.headers, this.params,
-				this.requestEntity);
+				this.requestEntity, contentLength);
 		final RibbonApacheHttpResponse response = this.client
 				.executeWithLoadBalancer(request);
 		context.set("ribbonResponse", response);

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/ribbon/apache/RibbonApacheHttpRequestTests.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2013-2016 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.cloud.netflix.ribbon.apache;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.startsWith;
+import static org.junit.Assert.assertThat;
+
+import java.io.ByteArrayInputStream;
+import java.net.URI;
+import java.nio.charset.Charset;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpEntityEnclosingRequest;
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.client.methods.HttpUriRequest;
+import org.junit.Test;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.StreamUtils;
+
+/**
+ * @author Spencer Gibb
+ */
+public class RibbonApacheHttpRequestTests {
+
+	@Test
+	public void testNullEntity() throws Exception {
+		URI uri = URI.create("http://example.com");
+		LinkedMultiValueMap<String, String> headers = new LinkedMultiValueMap<>();
+		headers.add("my-header", "my-value");
+		LinkedMultiValueMap<String, String> params = new LinkedMultiValueMap<>();
+		params.add("myparam", "myparamval");
+		RibbonApacheHttpRequest httpRequest = new RibbonApacheHttpRequest("GET", uri, false,
+				headers, params, null);
+
+		HttpUriRequest request = httpRequest.toRequest(RequestConfig.custom().build());
+
+		assertThat("request is wrong type", request, is(not(instanceOf(HttpEntityEnclosingRequest.class))));
+		assertThat("uri is wrong", request.getURI().toString(), startsWith(uri.toString()));
+		assertThat("my-header is missing", request.getFirstHeader("my-header"), is(notNullValue()));
+		assertThat("my-header is wrong", request.getFirstHeader("my-header").getValue(), is(equalTo("my-value")));
+		assertThat("myparam is missing", request.getURI().getQuery(), is(equalTo("myparam=myparamval")));
+	}
+
+
+	@Test
+	public void testNotNullEntity() throws Exception {
+		URI uri = URI.create("http://example.com");
+		LinkedMultiValueMap<String, String> headers = new LinkedMultiValueMap<>();
+		headers.add("Content-Length", "4");
+		String entityValue = "abcd";
+		RibbonApacheHttpRequest httpRequest = new RibbonApacheHttpRequest("POST", uri, false,
+				headers, new LinkedMultiValueMap<String, String>(), new ByteArrayInputStream(entityValue.getBytes()),
+				(long) entityValue.length());
+
+		HttpUriRequest request = httpRequest.toRequest(RequestConfig.custom().build());
+
+		assertThat("request is wrong type", request, is(instanceOf(HttpEntityEnclosingRequest.class)));
+		assertThat("uri is wrong", request.getURI().toString(), startsWith(uri.toString()));
+		assertThat("Content-Length is missing", request.getFirstHeader("Content-Length"), is(notNullValue()));
+		assertThat("Content-Length is wrong", request.getFirstHeader("Content-Length").getValue(), is(equalTo("4")));
+
+		HttpEntityEnclosingRequest entityRequest = (HttpEntityEnclosingRequest) request;
+		assertThat("entity is missing", entityRequest.getEntity(), is(notNullValue()));
+		HttpEntity entity = entityRequest.getEntity();
+		assertThat("contentLength is wrong", entity.getContentLength(), is(equalTo(4L)));
+		assertThat("content is missing", entity.getContent(), is(notNullValue()));
+		String string = StreamUtils.copyToString(entity.getContent(), Charset.forName("UTF-8"));
+		assertThat("content is wrong", string, is(equalTo(entityValue)));
+	}
+}