Replace GzipFilter and Tomcat compression with general purpose approach

Closes gh-3296

spring-boot-samples/spring-boot-sample-tomcat/src/test/java/sample/tomcat/SampleTomcatApplicationTests.java

@@ -16,16 +16,25 @@
 
 package sample.tomcat;
 
+import java.io.ByteArrayInputStream;
+import java.nio.charset.Charset;
+import java.util.zip.GZIPInputStream;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.test.SpringApplicationConfiguration;
 import org.springframework.boot.test.TestRestTemplate;
 import org.springframework.boot.test.WebIntegrationTest;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.util.StreamUtils;
+import org.springframework.web.client.RestTemplate;
 
 import static org.junit.Assert.assertEquals;
 
@@ -33,6 +42,7 @@ import static org.junit.Assert.assertEquals;
  * Basic integration tests for demo application.
  *
  * @author Dave Syer
+ * @author Andy Wilkinson
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringApplicationConfiguration(classes = SampleTomcatApplication.class)
@@ -51,4 +61,28 @@ public class SampleTomcatApplicationTests {
 		assertEquals("Hello World", entity.getBody());
 	}
 
+	@Test
+	public void testCompression() throws Exception {
+		HttpHeaders requestHeaders = new HttpHeaders();
+		requestHeaders.set("Accept-Encoding", "gzip");
+		HttpEntity<?> requestEntity = new HttpEntity<Object>(requestHeaders);
+
+		RestTemplate restTemplate = new TestRestTemplate();
+
+		ResponseEntity<byte[]> entity = restTemplate.exchange("http://localhost:"
+				+ this.port, HttpMethod.GET, requestEntity, byte[].class);
+
+		assertEquals(HttpStatus.OK, entity.getStatusCode());
+
+		GZIPInputStream inflater = new GZIPInputStream(new ByteArrayInputStream(
+				entity.getBody()));
+		try {
+			assertEquals("Hello World",
+					StreamUtils.copyToString(inflater, Charset.forName("UTF-8")));
+		}
+		finally {
+			inflater.close();
+		}
+	}
+
 }