moved files, this in on callback for httpserver class

lib/httpserver/filesys.cpp

 // deleteFile("/hello.txt");
 // writeFile("/hello.txt", "Hello ");
 // appendFile("/hello.txt", "World!\n\r");
-// readFile("/hello.txt");
+// printFile("/hello.txt");
 // listDir("/");
 
 FSInfo fsinfo;
   Serial.println();
 }
 
-void readFile(const char * path) {
+File open(const char * path) {
+  return LittleFS.open(path, "r");
+}
+
+
+void printFile(const char * path) {
   Serial.printf("Reading file: %s\n\r", path);
 
   File file = LittleFS.open(path, "r");

lib/httpserver/filesys.h

 bool mount_fs();
 bool format_fs();
 
+File open(const char * path);
+
 void ls(const char * dirname);
-void readFile(const char * path);
+void printFile(const char * path);
 void writeFile(const char * path, const char * message);
 void appendFile(const char * path, const char * message);
 void renameFile(const char * path1, const char * path2);

lib/httpserver/httpserver.cpp

   this->serveStatic("/favicon.png", LittleFS, "/favicon.png");
 
   return true;
-}
+}

lib/httpserver/httpserver.h

         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");
+            }
+            else
+            {
+                Serial.println("Streaming /compress.html.gz to client");
+                const String cont = "text/html";
+                streamFile(f, cont);
+            }
+        });
+
         if( this->addRootFileHandler() ){
             this->begin();
             Serial.printf("[HTTPServer] Server active on Port 80 !\n\r");

test/test_pwm.cpp

-#include <Arduino.h>
+// #include <Arduino.h>
 #include "treppe.h"
-
 #include <unity.h>
 
 Treppe stairs(10);