title: How to configure the flex crossdomain.xml in Python Google App Engine Sdk
body: <p>I have created a flex application in the Python Gae sdk and I got the error 2048, so I put a crossdomain.xml under the static folder.
  The crossdomain.xml is following:</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt; 
  &lt;!DOCTYPE cross-domain-policy SYSTEM “/xml/dtds/cross-domain-policy.dtd”&gt;
  &lt;cross-domain-policy&gt; 
  &lt;site-control permitted-cross-domain-policies="all"/&gt; 
  &lt;allow-access-from domain="*" to-ports="*" secure="false"/&gt; 
  &lt;allow-http-request-headers-from domain="*" headers="*" secure="false"/&gt; 
  &lt;/cross-domain-policy&gt; 
  </code></pre>
  
  <p>And, I add the following in the app.yaml:</p>
  
  <pre><code>- url: /crossdomain.xml 
    static_files: static/crossdomain.xml 
    upload: static/crossdomain.xml
  </code></pre>
  
  <p>However, I still got the error 2048.  Therefore, I would like to know is anything I need to configure or miss in my case and how to fix the error.</p>
  
  <p>Please advice.  Thanks.</p>