Support redirect to relative Uri, as specified by rfc3986#4.2.

tests/standalone/io/http_redirect_test.dart

Index: tests/standalone/io/http_redirect_test.dart
diff --git a/tests/standalone/io/http_redirect_test.dart b/tests/standalone/io/http_redirect_test.dart
index 363f8d0c684bcc848df83ae810ea566212aafc52..43e1760a07dc67d12281dc3583867b7d3c1c483b 100644
--- a/tests/standalone/io/http_redirect_test.dart
+++ b/tests/standalone/io/http_redirect_test.dart
@@ -57,6 +57,50 @@ Future<HttpServer> setupServer() {
        }
     );
 
+    // Setup redirects with relative url.
+    addRequestHandler(
+       "/redirectUrl",
+       (HttpRequest request, HttpResponse response) {
+         response.headers.set(HttpHeaders.LOCATION, "/some/relativeUrl");
+         response.statusCode = HttpStatus.MOVED_PERMANENTLY;
+         response.close();
+       }
+    );
+
+    addRequestHandler(
+       "/some/redirectUrl",
+       (HttpRequest request, HttpResponse response) {
+         response.headers.set(HttpHeaders.LOCATION, "relativeUrl");
+         response.statusCode = HttpStatus.MOVED_PERMANENTLY;
+         response.close();
+       }
+    );
+
+    addRequestHandler(
+       "/some/relativeUrl",
+       (HttpRequest request, HttpResponse response) {
+         response.close();
+       }
+    );
+
+    addRequestHandler(
+       "/redirectUrl2",
+       (HttpRequest request, HttpResponse response) {
+         response.headers.set(HttpHeaders.LOCATION, "location");
+         response.statusCode = HttpStatus.MOVED_PERMANENTLY;
+         response.close();
+       }
+    );
+
+    addRequestHandler(
+       "/redirectUrl3",
+       (HttpRequest request, HttpResponse response) {
+         response.headers.set(HttpHeaders.LOCATION, "./location");
+         response.statusCode = HttpStatus.MOVED_PERMANENTLY;
+         response.close();
+       }
+    );
+
     // Setup redirect chain.
     int n = 1;
     addRedirectHandler(n++, HttpStatus.MOVED_PERMANENTLY);
@@ -370,6 +414,76 @@ void testRedirectClosingConnection() {
   });
 }
 
+void testRedirectRelativeUrl() {
+  setupServer().then((server) {
+    HttpClient client = new HttpClient();
+
+    client.getUrl(Uri.parse("http://127.0.0.1:${server.port}/redirectUrl"))
+        .then((request) => request.close())
+        .then((response) {
+          response.listen(
+              (_) {},
+              onDone: () {
+                Expect.equals(HttpStatus.OK, response.statusCode);
+                Expect.equals(1, response.redirects.length);
+                server.close();
+                client.close();
+              });
+          });
+  });
+
+  setupServer().then((server) {
+    HttpClient client = new HttpClient();
+
+    client.getUrl(Uri.parse("http://127.0.0.1:${server.port}/some/redirectUrl"))
+        .then((request) => request.close())
+        .then((response) {
+          response.listen(
+              (_) {},
+              onDone: () {
+                Expect.equals(HttpStatus.OK, response.statusCode);
+                Expect.equals(1, response.redirects.length);
+                server.close();
+                client.close();
+              });
+          });
+  });
+
+  setupServer().then((server) {
+    HttpClient client = new HttpClient();
+
+    client.getUrl(Uri.parse("http://127.0.0.1:${server.port}/redirectUrl2"))
+        .then((request) => request.close())
+        .then((response) {
+          response.listen(
+              (_) {},
+              onDone: () {
+                Expect.equals(HttpStatus.OK, response.statusCode);
+                Expect.equals(1, response.redirects.length);
+                server.close();
+                client.close();
+              });
+          });
+  });
+
+  setupServer().then((server) {
+    HttpClient client = new HttpClient();
+
+    client.getUrl(Uri.parse("http://127.0.0.1:${server.port}/redirectUrl3"))
+        .then((request) => request.close())
+        .then((response) {
+          response.listen(
+              (_) {},
+              onDone: () {
+                Expect.equals(HttpStatus.OK, response.statusCode);
+                Expect.equals(1, response.redirects.length);
+                server.close();
+                client.close();
+              });
+          });
+  });
+}
+
 main() {
   testManualRedirect();
   testManualRedirectWithHeaders();
@@ -380,4 +494,5 @@ main() {
   testAutoRedirectLimit();
   testRedirectLoop();
   testRedirectClosingConnection();
+  testRedirectRelativeUrl();
 }