I am trying to pass error.content to messge Logging policy . I am getting below error from proxy and its assigned to error.content defuault variable . But I am not able to get this value to message Logging policy which I have placed in postClientFlow.
You can try the error.status.code and error.reason.phrase these two error variables give you the HTTP status code associated with the error and reason phrase associated with the error.
For more details about flow variables and error variables you can refer docs here :