unable to call third party service from apigee

[#1]

Hi,

I am facing issue while call third party service.

Able to hit third party service from postman (through client proxy)

Trying to hit same from target endpoint like this

<HTTPTargetConnection>
<Host>xxxxxx</Host>
<port>3128</port>
<Properties>
<Propertyname="use.proxy">true</Property>
</Properties>
  <SSLInfo>
            <Enabled>true</Enabled>
 </SSLInfo>
<URL>https://endpointurl</URL></HTTPTargetConnection>

please let me know, if i missing anything