Python script works as pure python but not with Flask

Question

I'm working on some code that pulls course info from Canvas. As pure python, it works fine. If I try to incorporate it with Flask, I get the following error

requests.exceptions.MissingSchema: Invalid URL 'run/api/v1/courses/1234567': No schema supplied. Perhaps you meant http://run/api/v1/courses/1234567?

This is the code in question:

Canvas file

import sys
from canvasapi import Canvas

def getinfo():
    canvasurl = "https://canvas.instructure.com/";
    canvastoken = #Redacted for this example

try:
    canvastoken = sys.argv[1];
    canvasurl = sys.argv[2];
except:
   print()


#Create a new canvas object passing in the newly aquired url and token
canvas = Canvas(canvasurl, canvastoken);

#print(canv)

# Create a new course oject -- passing in course number as a parameter
# Course number is currently hard coded

print(canvas.get_course(1234567))

Flask file code (the file that I'm trying to run):

from flask import Flask
import canvas

canvas.getinfo()

app = Flask(__name__)


@app.route('/')
def hello_world():
    return 'Hello World!'


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

what is the URL that you are using to test this?

Jibin Mathew
– Jibin Mathew

2019-03-15 06:04:56 +00:00
Commented Mar 15, 2019 at 6:04 — Jibin Mathew
– Jibin Mathew, Commented Mar 15, 2019 at 6:04

JoshG · Accepted Answer · 2019-03-15 06:09:17Z

1

No schema provided usually means you haven't specified the http:// or https:// in the URL.

In the code you provided, I don't see any reference to a run/api/v1/courses/1234567. One possibility is if you are using the url_for method from requests anywhere in your code, try setting _external=True:

url = url_for('relativeURL', _external=True)

This allows Flask to construct an absolute URL (i.e., a URL with domain included).

If you aren't using url_for, check other places in your code where you might be omitting the http or https from the URL.

If you update your question to include the part that refers to the offending URL, we might be able to provide more specific help.

answered Mar 15, 2019 at 6:09

JoshG

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