Disables httpclient auto decompression of encoded data

Applies only to SimpleHostRoutingFilter.

fixes gh-1480

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

@@ -245,6 +245,7 @@ public class SimpleHostRoutingFilter extends ZuulFilter {
 			httpClientBuilder.setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE);
 		}
 		return httpClientBuilder.setConnectionManager(newConnectionManager())
+				.disableContentCompression()
 				.useSystemProperties().setDefaultRequestConfig(requestConfig)
 				.setRetryHandler(new DefaultHttpRequestRetryHandler(0, false))
 				.setRedirectStrategy(new RedirectStrategy() {

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/zuul/filters/route/SimpleHostRoutingFilterTests.java

@@ -17,36 +17,68 @@
 package org.springframework.cloud.netflix.zuul.filters.route;
 
 import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.zip.GZIPOutputStream;
+
+import javax.servlet.http.HttpServletResponse;
 
 import org.apache.http.HttpEntityEnclosingRequest;
+import org.apache.http.HttpHost;
 import org.apache.http.HttpRequest;
+import org.apache.http.client.methods.CloseableHttpResponse;
 import org.apache.http.entity.InputStreamEntity;
 import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 import org.junit.After;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
+import org.springframework.boot.context.embedded.LocalServerPort;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.cloud.netflix.zuul.filters.ProxyRequestHelper;
 import org.springframework.cloud.netflix.zuul.filters.ZuulProperties;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.StreamUtils;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
+import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
 import static org.springframework.boot.test.util.EnvironmentTestUtils.addEnvironment;
+import static org.springframework.util.StreamUtils.copyToByteArray;
+import static org.springframework.util.StreamUtils.copyToString;
 
 /**
  * @author Andreas Kluth
  * @author Spencer Gibb
  */
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = SampleApplication.class,
+		webEnvironment = RANDOM_PORT,
+		properties = "server.contextPath: /app")
+@DirtiesContext
 public class SimpleHostRoutingFilterTests {
 
 	private AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
 
+	@LocalServerPort
+	private int port;
+
 	@After
 	public void clear() {
 		if (this.context != null) {
@@ -99,6 +131,32 @@ public class SimpleHostRoutingFilterTests {
 		assertTrue(httpEntityEnclosingRequest.getEntity() != null);
 	}
 
+	@Test
+	public void httpClientDoesNotDecompressEncodedData() throws Exception {
+		setupContext();
+		InputStreamEntity inputStreamEntity = new InputStreamEntity(new ByteArrayInputStream(new byte[]{1}));
+		HttpRequest httpRequest = getFilter().buildHttpRequest("GET", "/app/compressed/get/1", inputStreamEntity,
+				new LinkedMultiValueMap<String, String>(), new LinkedMultiValueMap<String, String>(), new MockHttpServletRequest());
+
+		CloseableHttpResponse response = getFilter().newClient().execute(new HttpHost("localhost", this.port), httpRequest);
+		assertEquals(200, response.getStatusLine().getStatusCode());
+		byte[] responseBytes = copyToByteArray(response.getEntity().getContent());
+		assertTrue(Arrays.equals(GZIPCompression.compress("Get 1"), responseBytes));
+	}
+
+	@Test
+	public void httpClientPreservesUnencodedData() throws Exception {
+		setupContext();
+		InputStreamEntity inputStreamEntity = new InputStreamEntity(new ByteArrayInputStream(new byte[]{1}));
+		HttpRequest httpRequest = getFilter().buildHttpRequest("GET", "/app/get/1", inputStreamEntity,
+				new LinkedMultiValueMap<String, String>(), new LinkedMultiValueMap<String, String>(), new MockHttpServletRequest());
+
+		CloseableHttpResponse response = getFilter().newClient().execute(new HttpHost("localhost", this.port), httpRequest);
+		assertEquals(200, response.getStatusLine().getStatusCode());
+		String responseString = copyToString(response.getEntity().getContent(), Charset.forName("UTF-8"));
+		assertTrue("Get 1".equals(responseString));
+	}
+
 	private void setupContext() {
 		this.context.register(PropertyPlaceholderAutoConfiguration.class,
 				TestConfiguration.class);
@@ -118,3 +176,38 @@ public class SimpleHostRoutingFilterTests {
 		}
 	}
 }
+
+@Configuration
+@EnableAutoConfiguration
+@RestController
+class SampleApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleApplication.class, args);
+	}
+
+	@RequestMapping(value = "/compressed/get/{id}", method = RequestMethod.GET)
+	public byte[] getCompressed(@PathVariable String id, HttpServletResponse response) throws IOException {
+		response.setHeader("content-encoding", "gzip");
+		return GZIPCompression.compress("Get " + id);
+	}
+
+	@RequestMapping(value = "/get/{id}", method = RequestMethod.GET)
+	public String getString(@PathVariable String id, HttpServletResponse response) throws IOException {
+		return "Get " + id;
+	}
+}
+
+class GZIPCompression {
+
+	public static byte[] compress(final String str) throws IOException {
+		if ((str == null) || (str.length() == 0)) {
+			return null;
+		}
+		ByteArrayOutputStream obj = new ByteArrayOutputStream();
+		GZIPOutputStream gzip = new GZIPOutputStream(obj);
+		gzip.write(str.getBytes("UTF-8"));
+		gzip.close();
+		return obj.toByteArray();
+	}
+}