For development purposes you can create a self-certified certificate.Here's how to do it on a linux-based system.
generate a private key
> openssl genrsa 1024 > key.pem
This will store a 1024 bit RSA key in the file key.pem Then, generate an SSL certificate with that key:
> openssl req -x509 -new -key key.pem > key-cert.pem