[Python] Django - post InMemoryUploadedFile to external REST api

In the Django Rest Framework I would like to post a file, received as an InMemoryUploadedFile, to a different server as soon as it is received.

It sounds simple, but the request.post() function does not seem to properly send over such a file :

def post(self, request, *args, **kwargs):
data = request.data
print(data)
# <QueryDict: {'file': [<InMemoryUploadedFile: myfile.pdf (application/pdf)>]}>
endpoint = OTHER_API_URL + "/endpoint"
r = requests.post(endpoint, files=data)


My other server receives the request (through flask) with the name of the file, but not the content:

@app.route("/endpoint", methods=["POST"])
def endpoint():
if flask.request.method == "POST":
# I removed the many checks to simplify the code
file = flask.request.files['file']
path = os.path.join(UPLOAD_FOLDER, file.filename)
file.save(path)

print(file) #<FileStorage: u'file.pdf' (None)>
print(os.path.getsize(path)) #0

return [{"response":"ok"}]


When posting a file directly to that api in form-data with postman, It works as expected:

print(file) # <FileStorage: u'file.pdf' ('application/pdf')>
print(os.path.getsize(path)) #8541


Any help on how to fix this, i.e. transform the InMemoryUploadedFile type in something a normal REST api can understand? Or maybe just adding the right headers?

Continue reading...