Missing Bearer token causes 401 in Requests

Missing Bearer token causes 401

$ python -c "import requests; print(requests.get('https://api.example.com/data').status_code)"
401

Why this happens

APIs that require OAuth2/JWT access tokens reject requests without an Authorization: Bearer <token> header.

Fix

Add the Authorization header with a valid token. Ensure the token is not expired and includes necessary scopes.

Wrong code

import requests
url = 'https://api.example.com/data'
r = requests.get(url)
print(r.status_code)

Fixed code

import requests
url = 'https://api.example.com/data'
headers = {'Authorization': 'Bearer eyJhbGciOi...'}
r = requests.get(url, headers=headers, timeout=10)
r.raise_for_status()
print(r.json())

Using Session

import requests
sess = requests.Session()
sess.headers.update({'Authorization': 'Bearer eyJhbGciOi...'})
resp = sess.get('https://api.example.com/data')
print(resp.ok)