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<bean id="billingSender" class="org.openhubframework.openhub.core.common.ws.transport.http.CloseableHttpComponentsMessageSender">
 <constructor-arg index="0" value="true"/> <!-- use Preemptive Auth-->
 <property name="credentials">
  <bean class="org.apache.http.auth.UsernamePasswordCredentials">
   <constructor-arg index="0" value="${billing.user}"/>
   <constructor-arg index="1" value="${billing.password}"/>
  </bean>
 </property>
 <property name="maxTotalConnections" value="${billing.maxTotalConnections}"/>
 <property name="defaultMaxPerHost" value="${billing.maxTotalConnections}"/>
 <property name="maxConnectionsPerHost">
  <props>
   <prop key="${billing.uri}">${billing.maxTotalConnections}</prop>
  </props>
 </property>
 <property name="connectionTimeout" value="${billing.connectionTimeout}"/>
 <property name="readTimeout" value="${billing.readTimeout}"/>
</bean>