I'm trying to control some RGB LEDs with ESP8266. I have built an HTML page to set the color and send the RGB color code to the ESP using HTTP get request. Everything works as expected. I just want to send an HTTP get request to the ESP and ask what the current color is. But after a couple of hours of searching and trying I don't know how to send data in response to get request, I just can send HTTP ok code. I'm using jquery to send get command as below

$.get(",50,60)", function(data,status){   
    //I don't know how to send data fram ESP get it here.

this is the corresponding ESP response code written in Arduini IDE

WiFiClient client = server.available();
   if (client) {
  String req = client.readStringUntil('\r');
  client.print("HTTP/1.1 200 OK\r\n");
  client.print("Access-Control-Allow-Origin: *");

This is the HTTP header, How do I send some data(text)?

  • look at the webserver example. something like server.send(200, "text/plain", someStringOfContentHere); build up the string with the data you need.
    – dandavis
    Mar 30, 2017 at 23:29
  • Thak you for your input. To use send method I have to include ESP8266WebServer.h and modify my code. I think there should an easy way to send some text (like HTML markup) after the header.
    – ahmadx87
    Mar 31, 2017 at 8:50
  • 1
    After the last header you need to send two newlines (\r\n\r\n) and then send your data.
    – Gerben
    Mar 31, 2017 at 10:45
  • 1
    Thank you @Gerben! I spent hours searching but no success. It worked like a charm.
    – ahmadx87
    Mar 31, 2017 at 16:20

1 Answer 1


@Gerben answered my question in a comment all credit goes to him. I retype it here maybe it helps someone in the future.

I had to send two new line after setting up the header

clinet.print("Hello, I'm comming from ESP!!");

And in jQuery I get it like this:

$.get(",50,60)", function(data,status){   
    var receivedData=data;  //=Hello, I'm comming from ESP!!

It is simple but it may help some newbie like me.

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