response.out.write in python, google app engine not displaying on local host
<p>my yaml file:</p>

<pre><code>application: testprogram
version: 1
runtime: python
api_version: 1

handlers:
- url: /.*
  script: main.py
</code></pre>

<p>my python file:</p>

<pre><code>import webapp2

class MainPage(webapp2.RequestHandler):
    def get(self):
        self.reponse.headers['Content-Type'] = 'text/plain'
        self.response.out.write("Hurray for cake!")

app = webapp2.WSGIApplication([('/', MainPage)],debug=True)
</code></pre>

<p>from the sever:</p>

<pre><code>$ dev_appserver.py testprogram
WARNING  2016-09-01 05:42:36,253 application_configuration.py:165] The "python" runtime specified in "testprogram/app.yaml" is not supported - the "python27" runtime will be used instead. A description of the differences between the two can be found here:
https://developers.google.com/appengine/docs/python/python25/diff27
INFO     2016-09-01 05:42:36,265 sdk_update_checker.py:229] Checking for updates to the SDK.
INFO     2016-09-01 05:42:36,400 sdk_update_checker.py:257] The SDK is up to date.
WARNING  2016-09-01 05:42:36,635 simple_search_stub.py:1146] Could not read search indexes from /tmp/appengine.testprogram.rickus/search_indexes
INFO     2016-09-01 05:42:36,639 api_server.py:205] Starting API server at: http://localhost:40100
INFO     2016-09-01 05:42:36,642 dispatcher.py:197] Starting module "default" running at: http://localhost:8080
INFO     2016-09-01 05:42:36,643 admin_server.py:116] Starting admin server at: http://localhost:8000
INFO     2016-09-01 05:42:51,325 module.py:788] default: "GET / HTTP/1.1" 200 -
</code></pre>

<p>sever is up. Local host is up. But nothing is being written out. I am doing udacitys course so I have just began. What could the hang up be. Been checking the docs and still lost.</p>

<p>You have a problem in <code>app.yaml</code> file in the handlers section:</p>

<p>Yours:</p>

<pre><code>application: testprogram
version: 1
runtime: python
api_version: 1

handlers:
- url: /.*
  script: main.py
</code></pre>

<p>but you should have:</p>

<pre><code>application: testprogram
version: 1
runtime: python27
api_version: 1
threadsafe: yes

handlers:
- url: /.*
  script: main.app
</code></pre>

python google-app-engine localhost yaml