It is 'https:' and if we try to open your link the browser reads -
Secure Connection Failed
An error occurred during a connection to files.minecraftforge.net. Cannot communicate securely with peer: no common encryption algorithm(s).
Error code: SSL_ERROR_NO_CYPHER_OVERLAP
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the web site owners to inform them of this problem.