add captive portals to caddy

Signed-off-by: Zoey <zoey@z0ey.de>

Caddyfile

@@ -3,6 +3,27 @@
 		protocols h1 h2c
 	}
 }
+http://captive.apple.com:80 {
+	respond "Success"
+}
+http://clients3.google.com:80 {
+	respond 204
+}
+http://connectivitycheck.gstatic.com:80 {
+	respond 204
+}
+http://www.msftncsi.com:80 {
+	respond "Microsoft NCSI"
+}
+http://www.msftconnecttest.com:80 {
+	respond "Microsoft Connect Test"
+}
+http://ipv6.msftconnecttest.com:80 {
+	respond "Microsoft Connect Test"
+}
+http://detectportal.firefox.com:80 {
+	respond "<meta http-equiv=\"refresh\" content=\"0;url=https://support.mozilla.org/kb/captive-portal\"/>"
+}
 http://:80 {
 	redir https://{host}{uri} permanent
 }