Flask returns 'Method not allowed' when submitting form

Question

I am closely following the very brief tutorial from Flask-wtf here. I have an issue where after I submit my name in my submit page form, it gives a "405 Method Not Allowed" message instead of directing me to the success page.

from flask import Flask, render_template, redirect
from forms import MyForm

app = Flask(__name__)
app.secret_key = 'mysecretKey'


@app.route('/submit', methods=('GET', 'POST'))
def submit():
    form = MyForm()
    if form.validate_on_submit():
        return redirect('/success')
    return render_template('submit.html', form=form)


@app.route('/success')
def success():
    return "Well done for entering your name!"


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

My form is here:

from flask_wtf import FlaskForm
from wtforms import StringField
from wtforms.validators import DataRequired


class MyForm(FlaskForm):
    name = StringField('name', validators=[DataRequired()])

My submit.html code is shown below (just like in the tutorial):

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Password page</title>
</head>
<body>

<form method="POST" action="/">
    {{ form.hidden_tag() }}
    {{ form.name.label }} {{ form.name(size=20) }}
    <input type="submit" value="Go">
</form>

</body>
</html>

EDIT: The if form.validate_on_submit() condition does not return True so the contents of the loop do not execute. I added a simple print statement in it which didn't execute.

maybe action="/" needs to be changed to action="/submit" — Umair Ayub
– Umair Ayub, Commented Dec 7, 2019 at 11:37
Sure. @app.route('/success') doesn't specify the access methods, so it'll default to just GET. You need @app.route('/success', methods=['POST']) — roganjosh
– roganjosh, Commented Dec 7, 2019 at 11:37
Hmm, ok. What route is throwing the error (look into the console to see where the request went)? Something seems awry — roganjosh
– roganjosh, Commented Dec 7, 2019 at 11:47
Try changing action="/" to action="{{ url_for('submit') }}". I'm missing something basic here, sorry — roganjosh
– roganjosh, Commented Dec 7, 2019 at 11:52

roganjosh · Accepted Answer · 2019-12-07 12:29:18Z

3

I'd be lying if I pretended to know exactly how all relative paths are resolved. However, you can fix this by changing:

<form method="POST" action="/">

to:

<form method="POST" action="{{ url_for('submit') }}">

It's one of those things that it really does make sense to pass the issue off to the library to figure out. Use url_for which also works in Jinja2 when rendering the template.

answered Dec 7, 2019 at 12:29

roganjosh

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1 Comment

roganjosh Over a year ago

@piccolo it would, in this case. Wait till you have blueprints etc. Then it's a bit much. Just point to the view name and avoid the stress :)

Sanil Khurana · Accepted Answer · 2019-12-07 11:45:05Z

0

The problem is you are not mentioning that the method success should handle POST requests.

from flask import Flask, render_template, redirect
from forms import MyForm

app = Flask(__name__)
app.secret_key = 'mysecretKey'


@app.route('/submit', methods=('GET', 'POST'))
def submit():
    form = MyForm()
    if form.validate_on_submit():
        return redirect('/success')
    return render_template('submit.html', form=form)


@app.route('/success')
def success():
    return "Well done for entering your name!"


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

with

from flask import Flask, render_template, redirect
from forms import MyForm

app = Flask(__name__)
app.secret_key = 'mysecretKey'


@app.route('/submit', methods=['GET', 'POST'])
def submit():
    form = MyForm()
    if form.validate_on_submit():
        return redirect('/success')
    return render_template('submit.html', form=form)

# This is the change I made.
@app.route('/success', methods=['POST'])
def success():
    return "Well done for entering your name!"


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

edited Dec 7, 2019 at 11:45

answered Dec 7, 2019 at 11:38

Sanil Khurana

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3 Comments

piccolo Over a year ago

Hi Sanil, I still get the same error after adding the POST method to success.

Daniel Roseman Over a year ago

@Sanil why would you think this was the problem? The form handling code is in submit, which already accepts POST, not success.

piccolo Over a year ago

@DanielRoseman it looks like the if form.validate_on_submit() does not return True and so it can't go to the success page. What are your thoughts?

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