Uploaded November 2018 | Updated September 2026, 3 weeks ago
This tutorial shows a more advanced example using the template processing features of the async HTTP web server libraries. Here, multiple placeholders are used and the content to replace is randomly generated.
For a written version of this tutorial with source code please check my blog:
techtutorialsx.com/2018/07/23/esp32-arduino-http-server-template-processing-with-multiple-placeholders
Related content:
Controlling HTTP methods allowed in server routes: techtutorialsx.com/2018/02/03/esp32-arduino-async-server-controlling-http-methods-allowed
Introduction to websockets in async web server: techtutorialsx.com/2018/08/14/esp32-async-http-web-server-websockets-introduction
Temperature, humidity and CO2 measurements from ESP32 server: techtutorialsx.com/2018/05/05/esp32-arduino-temperature-humidity-and-co2-concentration-web-server
ESP32 Firebeetle board:
dfrobot.com/product-1590.html
A lot more ESP32 written tutorials at my blog, with source code and detailed explanation:
techtutorialsx.com/category/esp32
ESP8266 tutorials:
techtutorialsx.com/category/esp8266
This tutorial shows a more advanced example using the template processing features of the async HTTP web server libraries. Here, multiple placeholders are used and the content to replace is randomly generated.
For a written version of this tutorial with source code please check my blog:
techtutorialsx.com/2018/07/23/esp32-arduino-http-server-template-processing-with-multiple-placeholders
Related content:
Controlling HTTP methods allowed in server routes: techtutorialsx.com/2018/02/03/esp32-arduino-async-server-controlling-http-methods-allowed
Introduction to websockets in async web server: techtutorialsx.com/2018/08/14/esp32-async-http-web-server-websockets-introduction
Temperature, humidity and CO2 measurements from ESP32 server: techtutorialsx.com/2018/05/05/esp32-arduino-temperature-humidity-and-co2-concentration-web-server
ESP32 Firebeetle board:
dfrobot.com/product-1590.html
A lot more ESP32 written tutorials at my blog, with source code and detailed explanation:
techtutorialsx.com/category/esp32
ESP8266 tutorials:
techtutorialsx.com/category/esp8266




![ESP32 Arduino: controlling a relay demo [written tutorial in blog]
Demo showing the control of a relay from the ESP32.
This video is just a demo, the tutorial can be found at my blog:
https://techtutorialsx.com/2018/02/17/esp32-arduino-controlling-a-relay/
You can find a lot more tutorials on the ESP32 at my blog:
https://techtutorialsx.com/category/esp32/ ESP32 Arduino: controlling a relay demo [written tutorial in blog]](https://i.ytimg.com/vi/TUd_R5gE514/mqdefault.jpg)





