diff --git a/sanic/sanic.py b/sanic/sanic.py
index 951632be..7b3e5d22 100644
--- a/sanic/sanic.py
+++ b/sanic/sanic.py
@@ -230,6 +230,16 @@ class Sanic:
         matched_params = re.findall(
             self.router.parameter_pattern, uri)
 
+        # _method is only a placeholder now, don't know how to support it
+        kwargs.pop('_method', None)
+        anchor = kwargs.pop('_anchor', '')
+        # _external need SERVER_NAME in config or pass _server arg
+        external = kwargs.pop('_external', False)
+        scheme = kwargs.pop('_scheme', '')
+        if scheme and not external:
+            raise ValueError('When specifying _scheme, _external must be True')
+
+        netloc = kwargs.pop('_server', self.config.get('SERVER_NAME', ''))
         for match in matched_params:
             name, _type, pattern = self.router.parse_parameter_string(
                 match)
@@ -271,11 +281,9 @@ class Sanic:
 
         # parse the remainder of the keyword arguments into a querystring
         if kwargs:
-            query_string = urlencode(kwargs)
-            out = urlunparse((
-                '', '', out,
-                '', query_string, ''
-            ))
+            query_string = urlencode(kwargs, doseq=True)
+            # scheme://netloc/path;parameters?query#fragment
+            out = urlunparse((scheme, netloc, out, '', query_string, anchor))
 
         return out
 
diff --git a/sanic/utils.py b/sanic/utils.py
index 8e8f8124..da13f478 100644
--- a/sanic/utils.py
+++ b/sanic/utils.py
@@ -6,7 +6,11 @@ PORT = 42101
 
 
 async def local_request(method, uri, cookies=None, *args, **kwargs):
-    url = 'http://{host}:{port}{uri}'.format(host=HOST, port=PORT, uri=uri)
+    if uri.startswith(('http:', 'https:', 'ftp:', 'ftps://' '//')):
+        url = uri
+    else:
+        url = 'http://{host}:{port}{uri}'.format(host=HOST, port=PORT, uri=uri)
+
     log.info(url)
     async with aiohttp.ClientSession(cookies=cookies) as session:
         async with getattr(
diff --git a/tests/test_url_building.py b/tests/test_url_building.py
index 480313b3..f2377c3a 100644
--- a/tests/test_url_building.py
+++ b/tests/test_url_building.py
@@ -5,7 +5,7 @@ from sanic import Sanic
 from sanic.response import text
 from sanic.views import HTTPMethodView
 from sanic.blueprints import Blueprint
-from sanic.utils import sanic_endpoint_test
+from sanic.utils import sanic_endpoint_test, PORT as test_port
 from sanic.exceptions import URLBuildError
 
 import string
@@ -39,6 +39,30 @@ def test_simple_url_for_getting(simple_app):
         assert response.text == letter
 
 
+def test_simple_url_for_getting_with_duplicate_params(simple_app):
+    kw = dict(arg1=['value1', 'value2'], _anchor='anchor')
+    for letter in string.ascii_letters:
+        url = simple_app.url_for(letter, **kw)
+
+        assert url == '/{}?arg1=value1&arg1=value2#anchor'.format(letter)
+        request, response = sanic_endpoint_test(simple_app, uri=url)
+        assert response.status == 200
+        assert response.text == letter
+
+
+def test_simple_url_for_getting_with_special_params(simple_app):
+    kw = dict(arg1='value1', _anchor='anchor', _scheme='http',
+              _server='localhost:{}'.format(test_port), _external=True)
+    url_fmt = 'http://localhost:{}/{}?arg1=value1#anchor'
+    for letter in string.ascii_letters:
+        url = simple_app.url_for(letter, **kw)
+
+        assert url == url_fmt.format(test_port, letter)
+        request, response = sanic_endpoint_test(simple_app, uri=url)
+        assert response.status == 200
+        assert response.text == letter
+
+
 def test_fails_if_endpoint_not_found():
     app = Sanic('fail_url_build')
 
@@ -75,6 +99,19 @@ def test_fails_url_build_if_param_not_passed():
     assert 'Required parameter `Z` was not passed to url_for' in str(e.value)
 
 
+def test_fails_url_build_if_params_not_passed():
+    app = Sanic('fail_url_build')
+
+    @app.route('/fail')
+    def fail():
+        return text('this should fail')
+
+    with pytest.raises(ValueError) as e:
+        app.url_for('fail', _scheme='http')
+
+    assert str(e.value) == 'When specifying _scheme, _external must be True'
+
+
 COMPLEX_PARAM_URL = (
     '/<foo:int>/<four_letter_string:[A-z]{4}>/'
     '<two_letter_string:[A-z]{2}>/<normal_string>/<some_number:number>')
@@ -179,11 +216,11 @@ def blueprint_app():
         return text(
             'foo from first : {}'.format(param))
 
-    @second_print.route('/foo') # noqa
+    @second_print.route('/foo')  # noqa
     def foo():
         return text('foo from second')
 
-    @second_print.route('/foo/<param>') # noqa
+    @second_print.route('/foo/<param>')  # noqa
     def foo_with_param(request, param):
         return text(
             'foo from second : {}'.format(param))