I have working http request call with JSON body. WHat I want to do is to use the same content as an external file. For this I have used "send files with the request" function, without using multi-part because our server doesn't support that. I tried with or without parameter name or MIME type and the result is the same 400. The same call is working if instead I use the JSON in the body. File location is good, i double checked that. THe actual content of the file is not displayed in the request.
Any ideas?