I am creating a SoupServer using:

  if6 = soup_address_new_any (SOUP_ADDRESS_FAMILY_IPV6, server->port);
  server->server = soup_server_new (SOUP_SERVER_INTERFACE, if6,
      SOUP_SERVER_PORT, server->port, NULL);

And then connecting to it using a client that uses HTTP/1.0.  (Don't ask, not my choice.)

I'm getting Bad Request errors, and I tracked it down to soup-message-server-io.c, in this line:

                /* No Host header, no AbsoluteUri */
                SoupAddress *addr = soup_socket_get_local_address (sock);
                const char *host = soup_address_get_physical (addr);

                url = g_strdup_printf ("%s://%s:%d%s",
                                       soup_socket_is_ssl (sock) ? "https" : "ht
                                       host, soup_address_get_port (addr),
                                       req_path);

The URL that gets created here is:

  http://::ffff:10.0.2.23:8080/push

This does not get parsed correctly by soup_uri_new(), thus ending in Bad Request.

AFAICT, this is a regression created by the g-inet changes.

It works correctly with an IPV4-only server.

I can see several possible ways/places to fix this, but not sure the best.  I'd be happy to create a patch with some direction.