Adapter Mount Prefix Mismatch

Adapter mount prefix mismatch

$ python -c "import requests; from requests.adapters import HTTPAdapter; s=requests.Session(); s.mount('http://api.', HTTPAdapter()); s.get('http://api.example.com')"
# Works, but if prefix wrong, custom behavior not applied

Why this happens

Mount prefixes must match URL scheme/host patterns; otherwise default adapter is used.

Fix

Mount on ‘http://’ and/or ‘https://’, or exact host prefixes.

Wrong code

import requests
from requests.adapters import HTTPAdapter
s = requests.Session()
s.mount('api.example.com', HTTPAdapter())
s.get('http://api.example.com')

Fixed code

import requests
from requests.adapters import HTTPAdapter
s = requests.Session()
s.mount('http://', HTTPAdapter())
s.mount('https://', HTTPAdapter())
s.get('http://api.example.com', timeout=10)