app.py

from flask import request, Flask

app = Flask(__name__)


@app.route("/", methods=["POST"])
def index():
    if request.content_type == 'application/pdf':
        with open('request.pdf', 'wb') as fout:
            fout.write(request.data)
        print('The received PDF file is copied at filename.pdf')
        return "File copied to server", 201
    return "Only PDFs are accepted.", 415


# Client code
import requests
with open('pdf-to-send.pdf', 'rb') as fin:
    data = fin.read()

requests.post('http://localhost:5000', data=data, headers={'Content-Type': 'application/pdf'})



if __name__ == "__main__":
    app.run()