Layer7 API Management

we are getting response from a server  in octet stream

some times we can read the message in layer7

by using either

${response.mainpart} or ${response.parts1.body}

some times  for 402 error codes and octet stream we cannot read the response message in Layer7.

while soap UI can read it if its not through layer7 by directly hitting the backend service.

I have Checked all headers and sending the request sames as in soapui or postman

Can any one point if Layer7 can read octet stream?

Where is the 402 error code being seen? Is this an HTTP error status or a code thrown by the API Gateway? Can you provide some additional context on any errors being seen? Can you elaborate further upon what you mean by being "unable to read" the response?