Now there are many ways to reply with a webpage content to a user who is accessing the web server, But Keeping in mind to use as less space as possible, I was trying something new, Since i didnt got compilation error, I am a little confused as to what might be the error,

in void data() I am storing the html page and saving it in ROM,

void data()
    File f=SPIFFS.open("/login.html","w");
    String s="<html><head><title>AP</title><h1>Welcome to AP page</h1>\n";
    s+="</head><body><form name=\"/myform\" action=\"/login\" method=\"POST\">\n";
    s+="<input type=\"text\" name=\"username\" placeholder=\"username\"><br/>\n";
    s+="<input type=\"password\" name=\"password\" placeholder=\"password\"><br/>\n";
    s+="<input type=\"submit\" value=\"login\"></form></body></html>";


Please correct the above lines if I wrote it wrong, After that, I wrote some lines in void setup()

WiFi.mode(WIFI_AP_STA);//Only Access point
  WiFi.softAP(ssid, password);  //Start HOTspot removing password will disable security

  IPAddress myIP = WiFi.softAPIP(); //Get IP address
  Serial.print("HotSpt IP:");

  server.on("/", HTTP_GET, handleRoot);      //Which routine to handle at root location


Now I am calling void handleRoot() I want to send the page that I wrote and saved in the /login.html file.

so for that,

void handleRoot()
    File f=SPIFFS.open("/login.html","r");
    server.send(200, "text/html",f.readStringUntil('EOF'));

Now once I do this and execute and load the program in ESP01, it shows me nothing, I have also tried sending (String)f, anything else I write is giving me an error, This is compiling fine, but when I connect to the AP and open in the browser i am not seeing anything, But when I wrote server.send(200,"text/html",(String)f) I was getting 0, Any idea on what mistake I am making.

  • What do you hope to achieve by having one bit of your program save a file of static data to SPIFFS and then another bit read that file and send it?
    – Majenko
    Commented Jul 18, 2018 at 14:45
  • Unless I format the device, I can remove the bit where I add those lines to save the HTML file. Like remove the block of that code later.
    – Wan Street
    Commented Jul 18, 2018 at 14:55
  • Why not use the IDE's SPIFFS tools to create the SPIFFS image with the file already on it?
    – Majenko
    Commented Jul 18, 2018 at 14:55
  • 1
    I suspect it's the 'EOF' that you're reading until. That's looking for the letter E not the end of the file.
    – Majenko
    Commented Jul 18, 2018 at 14:57
  • 1
    You should use server.streamFile("text/html", f);
    – Majenko
    Commented Jul 18, 2018 at 14:58

1 Answer 1


Small update, I used the same code for ESP8266 NodeMCU.

Sorry If I am posting this with wrong device number. But I tried that same code and uploaded it to ESP8266, it worked, and I am getting the AP webpage, that I am storing and sending the file. I will post it as an answer as I need to post an image.

The is the page that I get when using the HTML that I wrote:


So, this happened. I am confused as to why it didn't work with ESP01, plus I have to load the code every time I plug in the ESP01.


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