Configuring wso2esb to pass messages through proxy server

Organizations may expose the services over a proxy server for several purposes. In such a case, when user configures ESB, he has to provide proxy server configurations.
In axis2 configuration , at the transport sender configuration two properties has to be provided.

• http.proxyHost : Proxy server's IP
  
• http.proxyPort : Prosy server's port
  

eg :

 <transportSender name="http" class="org.apache.synapse.transport.nhttp.HttpCoreNIOSender">
        <parameter name="non-blocking" locked="false">true&lt;/parameter>
        <parameter name="http.proxyHost" locked="false">192.168.0.26  </parameter>
        <parameter name="http.proxyPort" locked="false">3128</parameter>
 </transportSender>

And a property (POST_TO_URI) has to be set in the synapse configuration to make ESB's out going URL a complete URL.

eg:

<inSequence>
    <property name="POST_TO_URI" value="true" scope="axis2"/>
    <send>
        <endpoint>
            <address uri="http://192.168.0.26:9000/services/SimpleStockQuoteService"/>
        </endpoint>
    </send>
</inSequence>

Depends on the proxy server's behaviour we may need to set some additional properties.

• DISABLE_CHUNKING : If the proxy server doesn't support HTTP chunking. 

<property name="DISABLE_CHUNKING" value="true" scope="axis2"/>

• FORCE_HTTP_1.0 : If proxy server supports only HTTP/1.0 messages.

<property name="FORCE_HTTP_1.0" value="true" scope="axis2"/>

 These properties can be applied to WSO2API Manager as well, since WSO2ESB is used as the gateway for APIManager.