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Example of uploading binary files programmatically in python, including both client and server code. Client implemented with the requests library and the server is implemented with the flask library.
import requests
url = "http://localhost:5000/"
fin = open('simple_table.pdf', 'rb')
files = {'file': fin}
r =, files=files)
print r.text
import os
from flask import Flask, request, redirect, url_for, send_from_directory
from werkzeug import secure_filename
UPLOAD_FOLDER = 'uploads'
ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'])
app = Flask(__name__)
def allowed_file(filename):
# this has changed from the original example because the original did not work for me
return filename[-3:].lower() in ALLOWED_EXTENSIONS
@app.route('/', methods=['GET', 'POST'])
def upload_file():
if request.method == 'POST':
file = request.files['file']
if file and allowed_file(file.filename):
print '**found file', file.filename
filename = secure_filename(file.filename)['UPLOAD_FOLDER'], filename))
# for browser, add 'redirect' function on top of 'url_for'
return url_for('uploaded_file',
return '''
<!doctype html>
<title>Upload new File</title>
<h1>Upload new File</h1>
<form action="" method=post enctype=multipart/form-data>
<p><input type=file name=file>
<input type=submit value=Upload>
def uploaded_file(filename):
return send_from_directory(app.config['UPLOAD_FOLDER'],
if __name__ == '__main__':

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commented Jan 7, 2019

what if i want to send a file from a server to client

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