ThingHTTP returns -1
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Vinod on 4 Oct 2021
Edited: Vinod on 4 Oct 2021
It appears that the certificate chain of the website may have an expired or invalid certificate or it is not from a recognized certification authority. You will have to change the request from HTTPS to HTTP so the certificate is not verified by the ThingSpeak servers. Change URL in ThingHTTP from https://<YOURSITE> to http://<YOURSITE>. For more details, see here: https://www.securityweek.com/expired-lets-encrypt-root-certificate-causes-problems-many-companies
NOTE: Using HTTP instead of HTTPS is strongly not-recommended. Ideally the maintainer of the website in question is able to update their site certificate chain.