[RFC] Synchronise header and body state of the Request / Response

[joelwurtz]

I would like to add some words about having consistency in Request / Response body and their headers.
The goal is to ensure that the headers represents well the body of a message,

Like if there is a Content-Encoding header with a gzip value, then the body should be gzip encoded. And if the client decode the body to make it not gzip he must remove this header. (So a next client in a chain will correctly handle the request)

I have been looking at PSR7 and i see no reference of that, but don't know if this standard should handle this or if we should propose to "amend" PSR7 to add this behavior ?