recvdoc(): Receiving 135 bytes.
Unexpected error occurred. Please contact your administrator if the issue
persists. Ticket number: 7c38d46e-36db-4677-9ee9-998e95ece26b
It says receiving (from the external site) 135 bytes.
Count the bytes to prove 135 bytes received.
HTTPAPI is working fine - well it is doing what you told it to do but the
other end is not understanding your request.
Are you consuming SOAP or REST web service ?
If SOAP test the call in SoapUI or REST try Postman or SoapUI.
Then once you get a successful response from the web service review what
the testing is sending to what you are sending in HTTPAPI.
Hope this helps you move forward.
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