I love the idea! But to be true to the original, shouldn't the message be self-propagating? > [...] header that can be transmitted from server to server [...]

I love the idea! But to be true to the original, shouldn't the message be self-propagating? > [...] header that can be transmitted from server to server [...] How so? In HTTP, there's always one client and one server. Am I missing some way to make this sticky or self-propagating, e.g. browsers or other clients that will cache received headers and then send them to other servers?