HTTPS request example on ESP8266 witty board
Add your WiFi credentials and server url into conf.h file.
To generate https fingerprint, use the following command:
openssl s_client -connect example.com:443
Copy everything in between -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- and paste it in a new file named cert.perm
Then use following command to generate fingerprint:
openssl x509 -noout -in ./cert.perm -fingerprint -sha1