A Minimal SPIFFS server

/* Create a WiFi access point and provide a web server on it.This program uses SPIFFS to hold files
create a website and upload to SPIFFS The root is 'index.htm'*/

#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <FS.h>

const char *ssid = "ESP";
const char *password = "";    //no password


ESP8266WebServer server(80);

//-----------------------------------------------------------------------------------------
void setup() {

  Serial.begin(115200);
  SPIFFS.begin();
  Serial.println();
  Serial.print("Configuring access point...  ");
  WiFi.softAP(ssid, password);
  IPAddress myIP = WiFi.softAPIP();
  Serial.print("Access Point IP address: ");
  Serial.println(myIP);
  server.onNotFound(handleOther);
  server.begin();
  Serial.println("HTTP server started");
}
//-----------------------------------------------------------------------------------------
// the clever bit

bool loadFromSpiffs(String path)
{
  String dataType = "text/plain";
  if (path.endsWith("/")) path += "index.htm"; //this is where index.htm is created

  if (path.endsWith(".src")) path = path.substring(0, path.lastIndexOf("."));
  else if (path.endsWith(".htm")) dataType = "text/html";
  else if (path.endsWith(".css")) dataType = "text/css";
  else if (path.endsWith(".js")) dataType = "application/javascript";
  else if (path.endsWith(".png")) dataType = "image/png";
  else if (path.endsWith(".gif")) dataType = "image/gif";
  else if (path.endsWith(".jpg")) dataType = "image/jpeg";
  else if (path.endsWith(".ico")) dataType = "image/x-icon";
  else if (path.endsWith(".xml")) dataType = "text/xml";
  else if (path.endsWith(".pdf")) dataType = "application/pdf";
  else if (path.endsWith(".zip")) dataType = "application/zip";

  File dataFile = SPIFFS.open(path.c_str(), "r");   //open file to read
  if (!dataFile)  //unsuccesful open?
  {
    Serial.print("Don't know this as a command and it's not a file in SPIFFS : ");
    Serial.println(path);
    return false;
  }

  if (server.streamFile(dataFile, dataType) != dataFile.size())
  {}    //a lot happening here...
  
  dataFile.close();
  return true;
}
//-----------------------------------------------------------------------------------------
void handleOther()
{
  Serial.println(server.uri());   // let's see what we are asked for
  if (loadFromSpiffs(server.uri()))
    return;   //gotcha - it's a file in SPIFFS

  String message = "Not Found\n\n";           //or not...
  message += "URI: ";     //make a 404 response
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET) ? "GET" : "POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i = 0; i < server.args(); i++)
  {
    message += " NAME:" + server.argName(i) + "\n VALUE:" + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
  Serial.println(message);
}

//-----------------------------------------------------------------------------------------

void loop() {
  server.handleClient();
}
//-----------------------------------------------------------------------------------------