Add next page navigation for RDAP nameserver searches

Domain and entity searches will be handled in future CLs.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=178912832

java/google/registry/request/RequestUrl.java

@@ -0,0 +1,31 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.request;
+
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import javax.inject.Qualifier;
+
+/**
+ * Dagger qualifier for the HTTP request URL.
+ *
+ * @see javax.servlet.http.HttpServletRequest#getRequestURL()
+ */
+@Retention(RUNTIME)
+@Qualifier
+@Documented
+public @interface RequestUrl {}