Search code examples
pythonsslpython-requests

Simple Python API Call - Hostname mismatch, certificate is not valid

I'm trying to use the following API using the Requests module:

https://www.planit.org.uk/api/

My code is the following (using the example they provided on the API doc):

import pandas as pd
import requests

url = "https://planit.org.uk//api/applics/json?auth=Hackney&start_date=2010-10-01&end_date=2010-10-02&pg_sz=10"
r = requests.get(url)
print(r)

And I get the following error:

requests.exceptions.SSLError: HTTPSConnectionPool(host='planit.org.uk', port=443): Max retries exceeded with url: //api/applics/json?auth=Hackney&start_date=2010-10-01&end_date=2010-10-02&pg_sz=10 (Caused by SSLError(SSLCertVerificationError(1, "[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'planit.org.uk'. (_ssl.c:1000)")))

Can anyone establish why I'm getting this error?

Solution

  • The certificate isn't configured for that hostname, only www.planit.org.uk. Check with a tool like this which can explain in more detail.

    PSA: When using both "dub" and "dubless" versions of your host, be sure to provision a certificate accordingly. This is an easy thing to overlook.