Add UrlFetch Example

appengine/urlfetch/README.md

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+## App Engine UrlFetch Docs Snippets
+
+This sample application demonstrates different ways to request a URL
+on App Engine
+
+

appengine/urlfetch/app.yaml

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+runtime: python27
+api_version: 1
+threadsafe: yes
+
+handlers:
+- url: .*
+  script: main.app

appengine/urlfetch/main.py

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+# Copyright 2016 Google Inc. 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.
+
+"""
+Sample application that demonstrates different ways of fetching
+URLS on App Engine
+"""
+
+import urllib
+import urllib2
+import webapp2
+
+from google.appengine.api import urlfetch
+
+
+def handle_error(e):
+    pass
+
+
+class UrlLibFetchHandler(webapp2.RequestHandler):
+    """ Demonstrates an HTTP query using urllib2
+    """
+
+    def get(self):
+        url = "http://www.google.com/"
+        try:
+            result = urllib2.urlopen(url)
+            self.response.write(result.read())
+        except urllib2.URLError, e:
+            handle_error(e)
+
+
+class UrlFetchHandler(webapp2.RequestHandler):
+    """ Demonstrates an HTTP query using urlfetch
+    """
+
+    def get(self):
+        url = "http://www.google.com/"
+        try:
+            result = urlfetch.fetch(url)
+            if result.status_code == 200:
+                self.response.write(result.content)
+            else:
+                self.response.status_code = result.status_code
+        except urllib2.URLError, e:
+            raise e
+
+
+class UrlPostHandler(webapp2.RequestHandler):
+    """ Demonstrates an HTTP POST form query using urlfetch
+    """
+
+    form_fields = {
+        "first_name": "Albert",
+        "last_name": "Johnson",
+    }
+
+    def get(self):
+        try:
+            form_data = urllib.urlencode(UrlPostHandler.form_fields)
+            headers = {'Content-Type': 'application/x-www-form-urlencoded'}
+            result = urlfetch.fetch(url="http://localhost:8080/submit_form",
+                                    payload=form_data,
+                                    method=urlfetch.POST,
+                                    headers=headers)
+            self.response.write(result.content)
+        except urllib2.URLError, e:
+            raise e
+
+
+class SubmitHandler(webapp2.RequestHandler):
+    """ Handler that receives UrlPostHandler POST request
+    """
+
+    def post(self):
+        self.response.out.write((self.request.get('first_name')))
+
+
+app = webapp2.WSGIApplication([
+    ('/', UrlLibFetchHandler),
+    ('/url_fetch', UrlFetchHandler),
+    ('/url_post', UrlPostHandler),
+    ('/submit_form', SubmitHandler)
+], debug=True)

appengine/urlfetch/main_test.py

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+# Copyright 2016 Google Inc. 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.
+
+import main
+
+import mock
+import pytest
+import webtest
+
+
+@pytest.fixture
+def app():
+    return webtest.TestApp(main.app)
+
+
+def test_url_lib(app):
+    response = app.get('/')
+    assert response.status_int == 200
+    assert "I'm Feeling Lucky" in response.body
+
+
+@mock.patch("main.urlfetch")
+def test_url_fetch(urlfetch_mock, app):
+    urlfetch_mock.fetch = mock.Mock(
+        return_value=mock.Mock(content="I'm Feeling Lucky",
+                               status_code=200))
+    response = app.get('/url_fetch')
+    assert response.status_int == 200
+    assert "I'm Feeling Lucky" in response.body
+
+
+@mock.patch("main.urlfetch")
+def test_url_post(urlfetch_mock, app):
+    urlfetch_mock.fetch = mock.Mock(
+        return_value=mock.Mock(content="Albert",
+                               status_code=200))
+    response = app.get('/url_post')
+    assert response.status_int == 200
+    assert "Albert" in response.body