Enabling HTTP Basic Authentication through a Proxy Server

If WSO2 ESB is behind a firewall, your proxy service might need to talk to a server through a proxy server, which might require HTTP basic authentication.

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To configure the ESB to communicate with the proxy server:

1. In <PRODUCT_HOME>/repository/conf/axis2/axis2.xml, edit the transportSender configuration of the http transport to specify the proxy server as follows:

   <transportSender name="http" class="org.apache.synapse.transport.passthru.PassThroughHttpSender"> <parameter name="non-blocking" locked="false">true</parameter> <parameter name="http.proxyHost" locked="false">localhost</parameter> <parameter name="http.proxyPort" locked="false">8080</parameter> </transportSender>

2. In the Synapse configuration of the proxy service that sends messages to this proxy server, set the following two properties before the send mediator:

   <syn:property name="Proxy-Authorization" expression="fn:concat('Basic ', base64Encode('userName:password'))" scope="transport"/> <syn:property name="POST_TO_URI" value="true" scope="axis2"/>

   The first property sets the Proxy-Authorization HTTP transport header with the base64 encoded user name and password as expected by the HTTP basic authentication. The second property makes the outgoing URL a complete URL understandable by the proxy server.

For example, in normal scenarios the outgoing request is sent as following:

But the proxy server requires sending the actual URL:

Following is a sample proxy service configuration that sets these two properties: