requests.exceptions.ReadTimeout: Server took too long to send data

ReadTimeout: Server took too long

$ python -c "import requests; requests.get('https://httpbin.org/delay/10', timeout=(3, 1))"
Traceback (most recent call last):
  ...
requests.exceptions.ReadTimeout: HTTPConnectionPool(...): Read timed out.

Why this happens

Server responds too slowly during the read phase.

Fix

Increase read timeout, optimize server, or stream content.

Wrong code

import requests
requests.get('https://httpbin.org/delay/10', timeout=1)

Fixed code

import requests
resp = requests.get('https://httpbin.org/delay/2', timeout=(3, 10))
print(resp.elapsed.total_seconds())