Get HTTP 400 error when invoking upload file API (https://upload.box.com/api/2.0/files/content). The message says “Malformed stream”, but gives no additional information. Tried the exact payload as specified in this box documentation page (https://developer.box.com/guides/uploads/direct/file/) and run it in Postman and still get the same error.

Request Payload:

POST /api/2.0/files/content HTTP/1.1

Host: upload.box.com

Authorization: Bearer rACCESS_TOKEN]

content-length: 343

content-type: multipart/form-data; boundary=------------------------9fd09388d840fef1



--------------------------9fd09388d840fef1

content-disposition: form-data; name="attributes"



{"name":"test.txt", "parent":{"id":"0"}}

--------------------------9fd09388d840fef1

content-disposition: form-data; name="file"; filename="test.txt"

content-type: text/plain



Test file text.



--------------------------9fd09388d840fef1--

Error Response:

{

    "code": "bad_request",

    "help_url": "http://developers.box.com/docs/#errors",

    "status": 400,

    "message": "Malformed stream",

    "type": "error"

}