------WebKitFormBoundaryBpwmk50wSJmsTPAH
Content-Disposition: form-data; name="operations"

{"operationName":null,"variables":{"file":null},"query":"mutation ($file: Upload!) {\n  singleUpload(file: $file) {\n    id\n    __typename\n  }\n}\n"}
------WebKitFormBoundaryBpwmk50wSJmsTPAH
Content-Disposition: form-data; name="map"

{"1":["variables.file"]}
------WebKitFormBoundaryBpwmk50wSJmsTPAH
Content-Disposition: form-data; name="1"; filename="a.txt"
Content-Type: text/plain

Alpha file content.

------WebKitFormBoundaryBpwmk50wSJmsTPAH--

