[9.7-2] MUST: The HTTP client also acts as the TLS client. It initiates a connection to the server on the appropri...

[saviorand]

RFC 9112 Requirement

Section: 9.7-2
Keyword: MUST

The HTTP client also acts as the TLS client. It initiates a connection to the server on the appropriate port and sends the TLS ClientHello to begin the TLS handshake. When the TLS handshake has finished, the client may then initiate the first HTTP request. All HTTP data MUST be sent as TLS "application data" but is otherwise treated like a normal connection for HTTP (including potential reuse as a persistent connection).¶

Reference: https://www.rfc-editor.org/rfc/rfc9112.html#section-9.7-2