Add UriComponents.toRelativeUrl, close AsyncHttpClient#677

Author: Stephane Landelle

api/src/main/java/org/asynchttpclient/uri/UriComponents.java

@@ -15,8 +15,10 @@
 import java.net.URI;
 import java.net.URISyntaxException;
 
-public class UriComponents {
+import org.asynchttpclient.util.MiscUtils;
 
+public class UriComponents {
+    
     public static UriComponents create(String originalUrl) {
         return create(null, originalUrl);
     }
@@ -104,6 +106,18 @@ public String toUrl() {
         return sb.toString();
     }
 
+    public String toRelativeUrl() {
+        StringBuilder sb = new StringBuilder();
+        if (MiscUtils.isNonEmpty(path))
+            sb.append(path);
+        else
+            sb.append('/');
+        if (query != null)
+            sb.append('?').append(query);
+
+        return sb.toString();
+    }
+
     @Override
     public String toString() {
         // for now, but might change