much simpler callback approach due to serveStatic with directories !!!

data/input.js

@@ -28,7 +28,7 @@ xhr.onreadystatechange = function(){
 }
 
 function reloadTerminal() {
-  xhr.open("GET", "/terminal", true);
+  xhr.open("POST", "/app=terminal", true);
   xhr.send();
   setTimeout(reloadTerminal, 1000);
 };

lib/httpserver/httpserver.cpp

@@ -1,17 +1,42 @@
 #include "httpserver.h"
 
+bool HTTPServer::start() {
+    if(!mount_fs()) {
+        logf("cant mount filesystem, EXIT !\n\r");
+        return false;
+    }
+    logf("[HTTPServer] LittleFS mounted !\n\r");
+    logf("[HTTPServer] root:\n\r");
+    this->listRoot();
+    logf("\n\r");
 
-bool HTTPServer::addRootFileHandler() {
+    // default handler
+    this->onNotFound([this]() {
+        String message = "File Not Found\n\n";
+        message += "URI: ";
+        message += uri();
+        message += "\nMethod: ";
+        message += (method() == HTTP_GET) ? "GET" : "POST";
+        message += "\nArguments: ";
+        message += args();
+        message += "\n";
 
-  // //experimental, see doku.md
-  // server.serveStatic("/compressed", LittleFS, "/compressed.html.gzip");
+        for (uint8_t i = 0; i < args(); i++) {
+            message += " " + argName(i) + ": " + arg(i) + "\n";
+        }
+        send(404, "text/plain", message);
+    });
 
-  this->serveStatic("", LittleFS, "/index.html");
-  this->serveStatic("/", LittleFS, "/index.html");
-  this->serveStatic("/#", LittleFS, "/index.html");
-  this->serveStatic("/style.css", LittleFS, "/style.css");
-  this->serveStatic("/input.js", LittleFS, "/input.js");
-  this->serveStatic("/favicon.png", LittleFS, "/favicon.png");
+    // add static root file handler for http
+    this->serveStatic("/", LittleFS, "/");
+    
+    // application handler
+    this->on("/app=terminal", HTTP_POST, [this]() {
+        String log_msg = "terminal: millis: ";
+        log_msg += millis();
+        send(200, "text/plain", log_msg);
+    });
 
-  return true;
-}
+    this->begin();
+    Serial.printf("[HTTPServer] Server active on Port 80 !\n\r");
+}

lib/httpserver/httpserver.h

@@ -1,19 +1,30 @@
 #pragma once
 
-#include "filesys.h"
 #include <ESP8266WebServer.h>
+#include <stdarg.h>
+#include "filesys.h"
+
+// debug log <ESP8266WebServer.h>
+// #define DEBUGV(f,...) do { Serial.printf(PSTR(f), ##__VA_ARGS__); } while (0)
+
+#define LOG_STR "[HTTPServer]"
+
 
 class HTTPServer : public ESP8266WebServer {
+
 private:
-    const char* rootDir;
+    const char* rootDir = "/";
  
-    bool addRootFileHandler();
-    bool formatFS() {
-        return format_fs();
-    }
     void listRoot() {
         ls(rootDir);
     }
+    void logf(const char *format, ...) {
+        va_list args;
+        va_start(args, format);
+        Serial.print(LOG_STR);
+        Serial.printf(format, args);
+        va_end(args);
+    }
 
 public:
     HTTPServer(const int _port, const char* _rootDir) :
@@ -24,71 +35,5 @@ public:
         Serial.printf("[HTTPServer] shut down ...\n\r");
     }
 
-    bool start() {
-        if(!mount_fs())
-            return false;
-        Serial.printf("[HTTPServer] LittleFS mounted !\n\r");
-
-        Serial.printf("[HTTPServer] root:\n\r");
-        this->listRoot();
-        Serial.printf("\n\r");
-
-        // https://stackoverflow.com/questions/7627098/what-is-a-lambda-expression-in-c11
-        on("/compress.html", [this]() {
-            File f = open("/compress.html.gz");
-            if (!f) {
-                Serial.println("Failed to open file for reading");
-                send(404, "text/plain", "Failed to open file for reading");
-            }
-            else
-            {
-                Serial.println("Streaming /compress.html.gz to client");
-                const String cont = "text/html";
-                streamFile(f, cont);
-            }
-        });
-        on("/comp.html", [this]() {
-            File f = open("/comp.html.gz");
-            if (!f) {
-                Serial.println("Failed to open file for reading");
-                send(404, "text/plain", "Failed to open file for reading");
-            }
-            else
-            {
-                Serial.println("Streaming /comp.html.gz to client");
-                const String cont = "text/html";
-                streamFile(f, cont);
-            }
-        });       
-        
-        on("/terminal", [this]() {
-            String log_msg = "terminal: millis: ";
-            log_msg += millis();
-            send(200, "text/plain", log_msg);
-        });
-
-        onNotFound([this]() {
-            String message = "File Not Found\n\n";
-            message += "URI: ";
-            message += uri();
-            message += "\nMethod: ";
-            message += (method() == HTTP_GET) ? "GET" : "POST";
-            message += "\nArguments: ";
-            message += args();
-            message += "\n";
-
-            for (uint8_t i = 0; i < args(); i++) {
-                message += " " + argName(i) + ": " + arg(i) + "\n";
-            }
-            send(404, "text/plain", message);
-        });
-
-        if( this->addRootFileHandler() ){
-            this->begin();
-            Serial.printf("[HTTPServer] Server active on Port 80 !\n\r");
-            return true;
-        }
-        Serial.printf("[HTTPServer] Not starting Server, something went wrong !\n\r");
-        return false;
-    }
+    bool start();
 };