Abstract: Systems and methods for HyperText Transfer Protocol (HTTP) HTTP Strict Transport Security (HSTS), are implemented by one or more servers associated with a gateway in a cloud based proxy. A method includes managing a preloaded list of HTTP Security (HTTPS) support of a plurality of domains; receiving a domain request from an HSTS application executed on a user device, wherein the HSTS application is configured to detect the domain request from a browser or application executed on the user device; and transmitting a response to the user device with header information related to support of HTTPS the domain.