Default to json if ujson isn't installed. Provide install extras

sanic/response.py

@@ -1,6 +1,10 @@
 from mimetypes import guess_type
 from os import path
+
+try:
     from ujson import dumps as json_dumps
+except ImportError:
+    from json import dumps as json_dumps
 
 from aiofiles import open as open_async
 

setup.py

@@ -17,12 +17,16 @@ with codecs.open(os.path.join(os.path.abspath(os.path.dirname(
 
 install_requires = [
     'httptools>=0.0.9',
-    'ujson>=1.35',
     'aiofiles>=0.3.0',
 ]
 
-if os.name != 'nt':
-    install_requires.append('uvloop>=0.5.3')
+ujson = [
+    'ujson>=1.35',
+]
+
+uvloop = [
+    'uvloop>=0.5.3',
+]
 
 setup(
     name='sanic',
@@ -36,6 +40,11 @@ setup(
     packages=['sanic'],
     platforms='any',
     install_requires=install_requires,
+    extras_require={
+        "all": install_requires + ujson + uvloop,
+        "ujson": install_requires + ujson,
+        "uvloop": install_requires + uvloop,
+    },
     classifiers=[
         'Development Status :: 2 - Pre-Alpha',
         'Environment :: Web Environment',

tests/test_request_data.py

@@ -2,7 +2,7 @@ import random
 
 from sanic import Sanic
 from sanic.response import json
-from ujson import loads
+from json import loads
 
 
 def test_storage():