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.

Does this help? https://stackoverflow.com/questions/11556958/sending-data-from-html-form-to-a-python-script-in-flask — DV82XL, Mar 08 '21 at 02:10
@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, Mar 08 '21 at 02:23
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, Mar 08 '21 at 02:29
To whatever the URL of your Flask app is. Looks like "path/" maybe? — Tim Roberts, Mar 08 '21 at 03:06

score 1 · Accepted Answer · answered Mar 08 '21 at 04:18

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")

Did this answer help you? – Andrew Clark Apr 03 '21 at 21:32 — Andrew Clark, Apr 03 '21 at 21:32

Cannot POST simple HTML form with Flask (Python)

1 Answers1