We introduce to you the HTTP Secure information on this post. Difference from HTTP HTTPS URLs begin with "https://" and use port 443 by default, whereas HTTP URLs begin with "http://" and use port 80 by default. HTTP is insecure and is subject to man-in-the-middle and eavesdropping attacks, which can let attackers gain access to website accounts and sensitive information. HTTPS is designed to withstand such attacks and is considered secure against such attacks (with the exception of older deprecated versions of SSL). Usage in websites As of 2014-10-12, 32.8% of the Internet's 151,509 most popular websites have a secure implementation of HTTPS.