How to overcome the issue "ESB adds port 80 to host header for http endpoints" in WSO2 ESB 4.8.1

There is a known issue in WSO2 ESB 4.8.1 where it adds port 80 to host header for http endpoints.

Issue: Please find the below logs on how ESB 4.8.1 sends the host header for http endpoints.

[2017-04-28 14:54:00,620] DEBUG - wire << "GET /v2/59030280110000c10b975dc7 HTTP/1.1[\r][\n]"
[2017-04-28 14:54:00,620] DEBUG - wire << "Accept-Encoding: gzip,deflate[\r][\n]"
[2017-04-28 14:54:00,620] DEBUG - wire << "Host: www.mocky.io:80[\r][\n]"
[2017-04-28 14:54:00,620] DEBUG - wire << "Connection: Keep-Alive[\r][\n]"
[2017-04-28 14:54:00,620] DEBUG - wire << "User-Agent: Synapse-PT-HttpComponents-NIO[\r][\n]"

As you could see in the above logs it always adds port 80 at the end of Host Header. As a solution you could add below property with the host header that you want the ESB to send the request.

<property name="REQUEST_HOST_HEADER" value="www.mocky.io" scope="axis2"></property>

Configured the below simple API to test the above property.

<api xmlns="http://ws.apache.org/ns/synapse" name="testAPI" context="/testAPI">
   <resource methods="GET">
      <inSequence>
<property name="REQUEST_HOST_HEADER" value="www.mocky.io" scope="axis2"></property>
         <send>
            <endpoint>
               <http method="get" uri-template="http://www.mocky.io/v2/59030280110000c10b975dc7"></http>
            </endpoint>
         </send>
      </inSequence>
      <outSequence>
        <send></send>
      </outSequence>
  </resource>
</api>

We received below logs after adding the REQUEST_HOST_HEADER property in the API.

[2017-04-28 15:13:34,735] DEBUG - wire << "GET /v2/59030280110000c10b975dc7 HTTP/1.1[\r][\n]"
[2017-04-28 15:13:34,736] DEBUG - wire << "Host: www.mocky.io[\r][\n]"
[2017-04-28 15:13:34,736] DEBUG - wire << "Accept-Encoding: gzip,deflate[\r][\n]"
[2017-04-28 15:13:34,736] DEBUG - wire << "Connection: Keep-Alive[\r][\n]"
[2017-04-28 15:13:34,736] DEBUG - wire << "User-Agent: Synapse-PT-HttpComponents-NIO[\r][\n]"