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Description of problem:
When connecting over proxy to IPv6 host, proxy returns 400 Bad Request because spice-gtk sends the address in the request without the enclosing brackets, e.g.:
CONNECT 1234::1122:33ff:fe44:5566:5900 HTTP/1.0
instead of correct:
CONNECT [1234::1122:33ff:fe44:5566]:5900 HTTP/1.0

Version-Release number of selected component (if applicable):
spice-gtk3-0.26-8.el7.x86_64
glib-networking-2.42.0-1.el7.x86_64
glib2-2.46.2-3.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. run SPICE_PROXY=http://proxy.example.com remote-viewer spice://[ipv6]:port
(ipv6 nor any VM has to be active, error takes place before proxy trying to connect to it)
2.
3.

Actual results:
400 Bad Request

Expected results:
successful connection or different error

Additional info:

Maybe a bug in proxy_lookup_ready() in spice-session.c, but this probably means spice_uri_create() (which returns a string of the form "spice://$host:$port") has the same issue.
Or a bug in wocky-http-proxy.c:create_request(), which could try to use g_inet_address_new_from_string () on g_proxy_address_get_destination_hostname() to make sure it's not an ipv6 address it needs to bracket.

As Christophe said, the problem was missing "[]" around the hostname
Fix was pushed upstream:
ea37f06eaa11b6307c797895aeb85d87d142625a

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2229.html