= gun:await_up(3)

== Name

gun:await_up - Wait for the connection to be up

== Description

[source,erlang]
----
await_up(ConnPid)
    -> await_up(ConnPid, 5000, MonitorRef)

await_up(ConnPid, MonitorRef)
    -> await_up(ConnPid, 5000, MonitorRef)

await_up(ConnPid, Timeout)
    -> await_up(ConnPid, Timeout, MonitorRef)

await_up(ConnPid, Timeout, MonitorRef)
    -> {ok, Protocol} | {error, Reason}

ConnPid    :: pid()
MonitorRef :: reference()
Timeout    :: timeout()
Protocol   :: http | http2 | socks
Reason     :: {down, any()} | timeout
----

Wait for the connection to be up.

== Arguments

ConnPid::

The pid of the Gun connection process.

Timeout::

How long to wait for, in milliseconds.

MonitorRef::

Monitor for the Gun connection process.
+
A monitor is automatically created for the duration of this
call when one is not provided.

== Return value

The protocol selected for this connection. It can be used
to determine the capabilities of the server. Error tuples
may also be returned when a timeout or an error occur.

== Changelog

* *2.0*: The error tuple type now includes the type of error.
* *1.0*: Function introduced.

== Examples

.Wait for the connection to be up
[source,erlang]
----
{ok, ConnPid} = gun:open("example.org", 443).
{ok, _} = gun:await_up(ConnPid).
----

== See also

link:man:gun(3)[gun(3)],
link:man:gun:open(3)[gun:open(3)],
link:man:gun:open_unix(3)[gun:open_unix(3)],
link:man:gun_tunnel_up(3)[gun_tunnel_up(3)],
link:man:gun_up(3)[gun_up(3)]