Looking for a simple HTML-template feature for ESP8266WebServer

[chess-levin]

Hi folks,
I'm using ESP8266WebServer for my ESP8266-12 project. I don't need async communication or several open connections. ESP826WebServer is small, is compatible with other lib and does nearly all I require from a web-server ;-). But I miss a way to realise a small HTML-template prozessor. Just to replace some place-holders in a HTML-template by some values or strings. I store my html files with Littlefs and serve them with serveStatic().

I don't want to implement a REST-API and use Ajax-Calls from the browser.

Now I need some hints how to implement this feature (I've only a small C++ knowledge).

The ESP8266WebServer.h shows, that there is no way of extending serveStatic(), but the on() method has two THandlerFunctions

  void serveStatic(const char* uri, fs::FS& fs, const char* path, const char* cache_header = NULL );

  void on(const Uri &uri, HTTPMethod method, THandlerFunction fn, THandlerFunction ufn);

Until now I'm using just one of these to define my request-handler to build my response to a certain request. My idea was may I could use the 2nd handler for implementing template processing. But I got stuck here...

Any help appreciated