Simple Flask Webhook Example

server.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from flask import Flask, request
from urllib import unquote_plus
import json
import re


app = Flask(__name__)


def parse_request(req):
    """
    Parses application/json request body data into a Python dictionary
    """
    payload = req.get_data()
    payload = unquote_plus(payload)
    payload = re.sub('payload=', '', payload)
    payload = json.loads(payload)

    return payload


@app.route('/', methods=['GET'])
def index():
    """
    Go to localhost:5000 to see a message
    """
    return ('This is a website.', 200, None)


@app.route('/api/print', methods=['POST'])
def print_test():
    """
    Send a POST request to localhost:5000/api/print with a JSON body with a "p" key
    to print that message in the server console.
    """
    payload = parse_request(request)
    print payload['p']
    return ("", 200, None)


@app.route('/api/sum', methods=['POST'])
def sum():
    """
    Send a POST request to localhost:5000/api/sum with a JSON body with an "a" and "b" key
    to have the app add those numbers together and return a response string with their sum.
    """
    print "Processing request..."
    payload = parse_request(request)
    print "Receieved following paylod:"
    print payload

    print "Adding sum..."
    summation = payload['a'] + payload['b']
    print "Found sum: %s" % summation

    print "Creating response string..."
    resp = '%s + %s = %s' % (payload['a'], payload['b'], summation)
    print "Sending the following response:"
    print resp

    return (resp, 200, None)


if __name__ == '__main__':
    app.run(debug=True, use_reloader=True)

@brizandrew
Thanks for posting this example it worked well. I have a cautionary note for python 3

For Python 3 the parse_request function can be replaced with
payload=request.get_json()

and of course replace print statements with print()

Calling http://127.0.0.1:5000/api/print?p=singleString with POST
gives me in POSTMAN an error:

<title>500 Internal Server Error</title>

Internal Server Error

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

how do you change the port and network adapter that it listens on?

how do you change the port and network adapter that it listens on?

Hi @dranastos:

this should be possible with:

if __name__ == '__main__':
    app.run(host=xxxxx,port=xxxx,debug=True, use_reloader=True)
 

@brizandrew Thanks for posting this example it worked well. I have a cautionary note for python 3

For Python 3 the parse_request function can be replaced with payload=request.get_json()

and of course replace print statements with print()

Thanks, I am just starting with Flask on Python 3.x and this helped.