Watsen Networks This document presents three YANG 1.1 modules as follows. The "iana- http-versions" module defines a YANG "typedef" for HTTP protocol versions. The "ietf-http-client" module defines a YANG "grouping" for configuring an HTTP client's ability to communicate with an HTTP service endpoint. The "ietf-http-server" module defines a "grouping" for configuring an HTTP server's service endpoints.