Merge pull request #350 from sthamman/null-response

Parsing error occurs when POST response is empty gzip content type

Author: ryber

unirest/src/main/java/kong/unirest/apache/ApacheResponse.java

@@ -81,8 +81,8 @@ public byte[] getContentAsBytes() {
         }
         try {
             InputStream is = getContent();
-            if (isGzipped(getEncoding())) {
-                is = new GZIPInputStream(getContent());
+            if (is.available() > 0 && isGzipped(getEncoding())) {
+              is = new GZIPInputStream(getContent());
             }
             return getBytes(is);
         } catch (IOException e2) {

unirest/src/test/java/BehaviorTests/GZipTest.java

@@ -30,8 +30,17 @@
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 
 public class GZipTest extends BddTest {
+    @Test
+    public void emptyGzip() {
+        HttpResponse<String> result = Unirest.post(MockServer.EMPTY_GZIP)
+                .asString();
+        assertFalse(result.getParsingError().isPresent());
+        assertEquals("", result.getBody());
+    }
+
     @Test
     public void testGzip() {
         HttpResponse<RequestCapture> resp = Unirest.get(MockServer.GZIP)

unirest/src/test/java/BehaviorTests/MockServer.java

@@ -68,6 +68,7 @@ public class MockServer {
 	public static final String ERROR_RESPONSE = HOST + "/error";
 	public static final String DELETE = HOST + "/delete";
 	public static final String GZIP = HOST + "/gzip";
+	public static final String EMPTY_GZIP = HOST + "/empty-gzip";
 	public static final String PATCH = HOST + "/patch";
 	public static final String INVALID_REQUEST = HOST + "/invalid";
 	public static final String PASSED_PATH_PARAM = GET + "/{params}/passed";
@@ -98,6 +99,7 @@ public static void reset(){
 		post("/post", MockServer::jsonResponse);
 		get("/get", MockServer::jsonResponse);
 		get("/gzip", MockServer::gzipResponse);
+		post("/empty-gzip", MockServer::emptyGzipResponse);
 		get("/redirect", MockServer::redirect);
 		patch("/patch", MockServer::jsonResponse);
 		get("/invalid", MockServer::inValid);
@@ -193,6 +195,14 @@ private static Object inValid(Request request, Response response) {
 		return "You did something bad";
 	}
 
+  private static Object emptyGzipResponse(Request request, Response response) throws Exception {
+    response.raw().setHeader("Content-Encoding", "gzip");
+    response.raw().setContentType("application/json");
+    response.raw().setStatus(200);
+    response.raw().getOutputStream().close();
+    return null;
+  }
+
 	private static Object gzipResponse(Request request, Response response) {
 		response.header("Content-Encoding", "gzip");
 		return jsonResponse(request, response);
@@ -248,7 +258,7 @@ public static void expectedPages(int expected) {
 	}
 
 	public static void main(String[] args){
-		
+
 	}
 
 	public static void expectCookie(String name, String value) {