const char web_Root[] PROGMEM = R"=====( <!doctype html> <meta name="viewport" content="width=device-width, initial-scale=1" /> <script src="microajax.js"></script> <html> <head> <title></title> <meta charset="utf-8" /> </head> <body> <link rel="stylesheet" href="style.css" type="text/css" /> It work's! </body> </html> )====="; void sendRootPage() { // digitalWrite(Blue_Led, LOW); if (server.args() > 0 ) // Are there any POST/GET Fields ? { for ( uint8_t i = 0; i < server.args(); i++ ) { // Iterate through the fields } } server.send ( 200, "text/html", web_Root ); digitalWrite(Blue_Led, HIGH); }