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[appendix]
== Migrating from Ranch 1.6 to 1.7
Ranch 1.7 adds built-in support for the PROXY protocol.
The PROXY protocol is a simple and efficient way for proxies
to transmit information about the client.
While a third-party library already existed, it was not
entirely compatible with the Ranch interface, in particular
when socket active mode was involved. This new implementation
fixes that and supports the full protocol with as little
overhead as possible compared to normal operations: just one
extra function call.
Ranch 1.7 is compatible with Erlang/OTP 19.0 onward. Support
for Erlang/OTP 18 has been removed.
=== Features added
* Full support for the PROXY protocol was added.
=== New functions
* Add the function `ranch:recv_proxy_header/2` to receive
the PROXY protocol header and parse it. It must be called
before `ranch:handshake/1,2`.
* Add the functions `ranch_proxy_header:parse/1` and
`ranch_proxy_header:header/1,2` to parse and build a
PROXY protocol header, respectively.
=== Bugs fixed
* Fix a race condition when the listener is restarted
after `ranch_listener_sup` crashes. This resulted in
the original options being used even if the options
were updated at runtime.
* Make the acceptors exit instead of crash when the
listening socket has been closed to prevent
unnecessary logs.
* Fix an issue where listener information would not get
cleaned up when an embedded listener was stopped. This
was fixed in Ranch 1.6.2.
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