Set X-Forwarded-Proto for SSL connections

templates/haproxy.cfg.tpl

@@ -23,6 +23,7 @@ frontend main
     bind    :80
     redirect scheme https code 301 if !{ ssl_fc }
     http-response set-header Strict-Transport-Security max-age=15768000
+    http-request set-header X-Forwarded-Proto https if { ssl_fc }
 {{- range .Hostnames }}
     use_backend {{ .Name | replace "." "_" }} if { hdr(host) -i {{ .Name }}
         {{- range $san, $_ := .Alternatives }} || hdr(host) -i {{ $san }} {{- end }} }