Flask: Echo POST

There is also a dictionary called "request.form" that is get filled by data submitted using a POST request. This too is a plain Python dictionary. In this case too we can use either the "request.form.get('field', '')" call we can use the "in" operator to check if the key is in the dictionary and then the regular dicstionary look-up.

examples/flask/echo_post/app.py
from flask import Flask, request

app = Flask(__name__)

@app.route("/")
def main():
    return '''
     <form action="/echo" method="POST">
         <input name="text">
         <input type="submit" value="Echo">
     </form>
     '''

@app.route("/echo", methods=['POST'])
def echo():
    user_text = request.form.get('text', '')
    if user_text:
        return "You said: " + user_text
    return "Nothing to say?"