title: Why do I get transport error in WSO2 ESB if I remove the filter?
body: <p>I have the following proxy:</p>
  
  <pre><code>&lt;proxy name="expedientes" transports="https http" startOnLoad="true" trace="enable" statistics="enable"&gt;
      &lt;target inSequence="main" outSequence="main" faultSequence="main"&gt;
          &lt;endpoint&gt;
              &lt;address uri="https://someweb/somepath/"/&gt;
              &lt;property name="Authorization" expression="fn:concat('Basic ', base64Encode('user:password'))" scope="transport"/&gt;
          &lt;/endpoint&gt;
      &lt;/target&gt;
  &lt;/proxy&gt;
  </code></pre>
  
  <p>with the this default main sequence:</p>
  
  <pre><code>&lt;sequence name="main"&gt;
      &lt;in&gt;
          &lt;log level="full"/&gt;
          &lt;filter source="get-property('To')" regex="http://localhost:9000.*"&gt;
              &lt;send/&gt;
          &lt;/filter&gt;
      &lt;/in&gt;
      &lt;out&gt;
          &lt;send/&gt;
      &lt;/out&gt;
  &lt;/sequence&gt;
  </code></pre>
  
  <p>When I remove the filter and leave it as:</p>
  
  <pre><code>&lt;sequence name="main"&gt;
      &lt;in&gt;
          &lt;log level="full"/&gt;
          &lt;send/&gt;
      &lt;/in&gt;
      &lt;out&gt;
          &lt;send/&gt;
      &lt;/out&gt;
  &lt;/sequence&gt;
  </code></pre>
  
  <p>I get the following error "Unexpected error during sending message out: org.apache.axis2.AxisFault: The system cannot infer the transport information from the /services/expedientes/indice.xml":</p>
  
  <pre><code>TID: [] [WSO2 ESB] [2013-02-15 12:42:05,531] ERROR
  {org.apache.synapse.core.axis2.Axis2Sender} - Unexpected error during sending message out 
  {org.apache.synapse.core.axis2.Axis2Sender}org.apache.axis2.AxisFault: The system cannot infer the transport information from the /services/expedientes/indice.xml URL. at
  ...
  </code></pre>
  
  <p>The out message should (obviously) use the same transport to answer the request (HTTP GET). But what has this to do with "filter"? </p>