fetch multiple header values for the same header name

src/main/java/com/android/volley/toolbox/BasicNetwork.java

@@ -56,9 +56,9 @@
 public class BasicNetwork implements Network {
     protected static final boolean DEBUG = VolleyLog.DEBUG;
 
-    private static int SLOW_REQUEST_THRESHOLD_MS = 3000;
+    private static final int SLOW_REQUEST_THRESHOLD_MS = 3000;
 
-    private static int DEFAULT_POOL_SIZE = 4096;
+    private static final int DEFAULT_POOL_SIZE = 4096;
 
     protected final HttpStack mHttpStack;
 
@@ -149,8 +149,8 @@ public NetworkResponse performRequest(Request<?> request) throws VolleyError {
             } catch (MalformedURLException e) {
                 throw new RuntimeException("Bad URL " + request.getUrl(), e);
             } catch (IOException e) {
-                int statusCode = 0;
-                NetworkResponse networkResponse = null;
+                int statusCode;
+                NetworkResponse networkResponse;
                 if (httpResponse != null) {
                     statusCode = httpResponse.getStatusLine().getStatusCode();
                 } else {
@@ -178,7 +178,7 @@ public NetworkResponse performRequest(Request<?> request) throws VolleyError {
                         throw new ServerError(networkResponse);
                     }
                 } else {
-                    throw new NetworkError(networkResponse);
+                    throw new NetworkError();
                 }
             }
         }
@@ -273,8 +273,13 @@ private byte[] entityToBytes(HttpEntity entity) throws IOException, ServerError
      */
     protected static Map<String, String> convertHeaders(Header[] headers) {
         Map<String, String> result = new TreeMap<String, String>(String.CASE_INSENSITIVE_ORDER);
-        for (int i = 0; i < headers.length; i++) {
-            result.put(headers[i].getName(), headers[i].getValue());
+        for (Header header : headers) {
+            String value = result.get(header.getName());
+            if (value == null) {
+                result.put(header.getName(), header.getValue());
+            } else {
+                result.put(header.getName(), value + ", " + header.getValue());
+            }
         }
         return result;
     }

src/main/java/com/android/volley/toolbox/HurlStack.java

@@ -35,6 +35,7 @@
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -58,7 +59,7 @@ public interface UrlRewriter {
          * Returns a URL to use instead of the provided one, or null to indicate
          * this URL should not be used at all.
          */
-        public String rewriteUrl(String originalUrl);
+        String rewriteUrl(String originalUrl);
     }
 
     private final UrlRewriter mUrlRewriter;
@@ -115,19 +116,33 @@ public HttpResponse performRequest(Request<?> request, Map<String, String> addit
         StatusLine responseStatus = new BasicStatusLine(protocolVersion,
                 connection.getResponseCode(), connection.getResponseMessage());
         BasicHttpResponse response = new BasicHttpResponse(responseStatus);
+        response.setHeaders(headersFromHeaderFields(connection.getHeaderFields()));
         response.setEntity(entityFromConnection(connection));
-        for (Entry<String, List<String>> header : connection.getHeaderFields().entrySet()) {
-            if (header.getKey() != null) {
-                Header h = new BasicHeader(header.getKey(), header.getValue().get(0));
-                response.addHeader(h);
+        return response;
+    }
+
+    private Header[] headersFromHeaderFields(Map<String, List<String>> headerFields) {
+        List<Header> headersList = new ArrayList<Header>();
+        for (Entry<String, List<String>> headerField : headerFields.entrySet()) {
+            headersList.addAll(headersFromHeaderField(headerField));
+        }
+        return headersList.toArray(new Header[headersList.size()]);
+    }
+
+    private List<Header> headersFromHeaderField(Entry<String, List<String>> headerField) {
+        List<Header> headers = new ArrayList<Header>();
+        String headerName = headerField.getKey();
+        if (headerName != null) {
+            for (String headerValue : headerField.getValue()) {
+                headers.add(new BasicHeader(headerName, headerValue));
             }
         }
-        return response;
+        return headers;
     }
 
     /**
      * Initializes an {@link HttpEntity} from the given {@link HttpURLConnection}.
-     * @param connection
+     * @param connection the connection where the HttpEntity gets created from
      * @return an HttpEntity populated with data from <code>connection</code>.
      */
     private static HttpEntity entityFromConnection(HttpURLConnection connection) {
@@ -154,7 +169,7 @@ protected HttpURLConnection createConnection(URL url) throws IOException {
 
     /**
      * Opens an {@link HttpURLConnection} with parameters.
-     * @param url
+     * @param url the url to which the connection should be opened
      * @return an open connection
      * @throws IOException
      */