Support IPv4 HTTP public gateway entries

backend/internal/nginxconfig/nginxconfig_test.go

@@ -111,6 +111,18 @@ func TestRenderHTTPCustomPort(t *testing.T) {
 	}
 }
 
+func TestRenderHTTPIPv4AndRejectHTTPSIPv4(t *testing.T) {
+	opts := RenderOptions{Domain: "121.4.111.208", Scheme: "http", Port: 28080}
+	site, httpsSite, err := RenderWithOptions(opts, nil, 0)
+	if err != nil || httpsSite != "" || !strings.Contains(site, "listen 28080;") || !strings.Contains(site, "server_name 121.4.111.208;") {
+		t.Fatalf("HTTP IPv4 rendering failed: %v, %q, %q", err, site, httpsSite)
+	}
+	opts.Scheme = "https"
+	if _, _, err := RenderWithOptions(opts, nil, 0); err == nil {
+		t.Fatal("HTTPS IPv4 must be rejected")
+	}
+}
+
 func TestRenderHTTPSCustomPort(t *testing.T) {
 	routes := gin.RoutesInfo{{Method: "GET", Path: "/api/health"}}
 	httpSite, httpsSite, err := RenderWithOptions(RenderOptions{Domain: "vpn.example.com", Scheme: "https", Port: 8443}, routes, 0)