Using Flask to access Google's API

Question

I'm trying to create a Flask app that talks to Google's API. However, I keep getting this error:

Traceback (most recent call last):
  File "hello.py", line 16, in <module>
    @app.route('google_api')
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1013, in decorator
    self.add_url_rule(rule, endpoint, f, **options)
  File "/Library/Python/2.7/site-packages/flask/app.py", line 62, in wrapper_func
    return f(self, *args, **kwargs)
  File "/Library/Python/2.7/site-packages/flask/app.py", line 976, in add_url_rule
    rule = self.url_rule_class(rule, methods=methods, **options)
  File "/Library/Python/2.7/site-packages/werkzeug/routing.py", line 599, in __init__
    raise ValueError('urls must start with a leading slash')
ValueError: urls must start with a leading slash

I went through the Flask tutorial and the "Using OAuth 2.0 for Web Services" on Google's website. I'm not quite sure what I'm doing wrong, and I'm not quite sure what the error is telling me. It looks like it has something to do with with Flask? Here is my code:

from flask import Flask
from oauth2client import client

app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello world!"

@app.route('google_api')
def google_api():
    flow = client.flow_from_clientsecrets(
        'client_secrets.json',
        scope='https://www.googleapis.com/auth/prediction',
        redirect_uri='http://127.0.0.1:5000/redirect')

@app.route('/redirect')
def redir():
    return "Authenticated"


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

What am I doing wrong? How can I fix it?

colmjude · Accepted Answer · 2016-10-24 13:10:32Z

3

I think you are missing the leading slash from your google api route.

@app.route('google_api')

Have you tried updating to

@app.route('/google_api')

Hope that helps

answered Oct 24, 2016 at 13:10

colmjude

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1 Comment

topless Over a year ago

I would also suggest redirect_uri=flask.redirect(flask.url_for('redir')) so you can have your endpoints work on every domain.

Paul Mouzas · Accepted Answer · 2016-10-24 13:14:46Z

0

Here are the import parts of the error you are getting.

 File "hello.py", line 16, in <module>
    @app.route('google_api')
...
ValueError: urls must start with a leading slash

Try:

    @app.route('/google_api')

Notice the forward slash before google_api

answered Oct 24, 2016 at 13:14

Paul Mouzas

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