.serveStatic

[EspOS8266]

ESP8266
server.serveStatic("/index.html", LittleFS, "/index.html");
It doesn't work in AP Captive Portal mode after a file upload without a reboot.

server.serveStatic("/index.html", LittleFS, "/index.html").setCacheControl("no-store").setTemplateProcessor(asyncProcessor).;
.server.serveStatic("/index.html", LittleFS, "/index.html").setCacheControl("no-store").setAuthentication("user","pass");
3x ram usage, not modify parameters.

[qniens]

Use this one:
https://github.com/ESP32Async/ESPAsyncWebServer

[EspOS8266]

I tried. It's full of bugs and has terrible RAM usage. This fork perfect.