[10.1-1] MUST: The "message/http" media type can be used to enclose a single HTTP request or response message, prov...

[saviorand]

RFC 9112 Requirement

Section: 10.1-1
Keyword: MUST

The "message/http" media type can be used to enclose a single HTTP request or response message, provided that it obeys the MIME restrictions for all "message" types regarding line length and encodings. Because of the line length limitations, field values within "message/http" are allowed to use line folding (obs-fold), as described in Section 5.2, to convey the field value over multiple lines. A recipient of "message/http" data MUST replace any obsolete line folding with one or more SP characters when the message is consumed.¶

Reference: https://www.rfc-editor.org/rfc/rfc9112.html#section-10.1-1