Upload panics

[nicolaiunrein]

I get the following error when trying to upload a .png:
panicked at 'byte index 19 is not a char boundary; it is inside '|' (bytes 18..19) of `test.png:image/png|PNG`

And this is my form data:

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

{"operationName":"upload","variables":{"file":null},"query":"mutation upload($file: Upload!) {\n  upload(file: $file)\n}\n"}
------WebKitFormBoundaryF5RA2VMgDmAIU1OT
Content-Disposition: form-data; name="map"

{"1":["variables.file"]}
------WebKitFormBoundaryF5RA2VMgDmAIU1OT
Content-Disposition: form-data; name="1"; filename="test.png"
Content-Type: image/png


------WebKitFormBoundaryF5RA2VMgDmAIU1OT--

[sunli829]

I caused this problem by saving the file contents directly into the string, and now I base64 it.