Spring supports proxy configuration. We just need to configure the bean SimpleClientHttpRequestFactory which has a property proxy with java.net.Proxy bean. A sample configuration is shown in the following code:
<bean id="requestFactory" class="org.springframework.http.client.SimpleClientHttpRequestFactory">
<property name="proxy">
<bean id="proxy" class="java.net.Proxy">
<constructor-arg>
<util:constant static-field="java.net.Proxy.Type.HTTP"/>
</constructor-arg>
<constructor-arg>
<bean class="java.net.InetSocketAddress">
<constructor-arg value="123.0.0.1"/>
<constructor-arg value="8080"/>
</bean>
</constructor-arg>
</bean>
</property>
</bean>