Cannot POST simple HTML form with Flask (Python)

Question

This is an incredibly simple question and I am ashamed to be asking it here, but I have been Googling answers for the past 3 hours with no results.

Basically, I am trying to send information using an HTML form and accept that information with a Flask python script. The problem is whenever I try to submit the form, it says Cannot POST path/form.html

The HTML Form:

<form method="post"> 
<label for="firstname">First Name:</label>
<input type="text" id="firstname" name="fname" placeholder="firstname">
<label for="lastname">Last Name:</label>
<input type="text" id="lastname" name="lname" placeholder="lastname">
<button type="submit">Login</button>

The Python/Flask Code:

from flask import Flask, request, render_template  

# Flask constructor
app = Flask(__name__)

# A decorator used to tell the application
# which URL is associated function
@app.route('/', methods =["GET", "POST"])
def gfg():
    if request.method == "POST":
       # getting input with name = fname in HTML form
       first_name = request.form.get("fname")
       # getting input with name = lname in HTML form
       last_name = request.form.get("lname")
       return "Your name is "+first_name + last_name
    return render_template("form.html")

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

I know this should be simple but web development is not my forte and this is really out of my element. Is this a server problem? Thank you in advance.

@RichardMcCormick it does, go read it again. You don't have an action path set, and it's trying to POST to the page it came from. — Jared Smith
– Jared Smith, Commented Mar 8, 2021 at 2:23
Where do I set the action path to? I have tried using the folder which contains both files but this is not working either. — Richard McCormick
– Richard McCormick, Commented Mar 8, 2021 at 2:29
I think this may work for you <form action="{{ url_for('gfg') }}" method="post"> — Sflagg
– Sflagg, Commented Mar 8, 2021 at 3:17

Andrew Clark · Accepted Answer · 2021-03-08 04:18:17Z

2

Try the following:

@app.route('/', methods =["GET", "POST"])
def gfg():
    if request.method == "POST":
       # getting input with name = fname in HTML form
       if "fname" in request.form:
           first_name = request.form['fname]
       # getting input with name = lname in HTML form
       if "lname" in request.form:
           last_name = request.form["lname"]
    
       if first_name and last_name:
           print("Your name is "+first_name + last_name)
           
    return render_template("form.html")

answered Mar 8, 2021 at 4:18

Andrew Clark

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