main.py

# 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 logging
import urllib

# [START urllib2-imports]
import urllib2
# [END urllib2-imports]

# [START urlfetch-imports]
from google.appengine.api import urlfetch
# [END urlfetch-imports]
import webapp2


class UrlLibFetchHandler(webapp2.RequestHandler):
    """ Demonstrates an HTTP query using urllib2"""

    def get(self):
        # [START urllib-get]
        url = "http://www.google.com/"
        try:
            result = urllib2.urlopen(url)
            self.response.write(result.read())
        except urllib2.URLError, e:
            logging.error("Caught exception fetching url {}".format(e))
        # [END urllib-get]


class UrlFetchHandler(webapp2.RequestHandler):
    """ Demonstrates an HTTP query using urlfetch"""

    def get(self):
        # [START urlfetch-get]
        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 urlfetch.Error, e:
            logging.error("Caught exception fetching url {}".format(e))
        # [END urlfetch-get]


class UrlPostHandler(webapp2.RequestHandler):
    """ Demonstrates an HTTP POST form query using urlfetch"""

    form_fields = {
        "first_name": "Albert",
        "last_name": "Johnson",
    }

    def get(self):
        # [START urlfetch-post]
        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 urlfetch.Error, e:
            logging.error("Caught exception fetching url {}".format(e))
        # [END urlfetch-post]


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)