Il 15/02/2012 22:28, Adrien de Croy ha scritto:

having dealt with support issues relating primarily to HTTP for the last
17 years, I'd STRONGLY recommend against using anything HTTP based. The
number of proxies that break WebDAV makes it problematic alone.

If some clients need HTTP-based access to some IMAP function, they can
use a gateway.

Such a gateway should be a mandatory part of the protocol, or we will end up on having a lot of servers with the http gateway and many other servers without it, really bad user experience.

Could we think a "skype-like" solution, where the client makes two attempts:

1) Direct socket connection on a single TCP port
 and then, in case of failure
2) https tunnel of the same protocol (thru optional client side proxy).
   https is more likely to survive across proxyes than http.

?
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