hello maxgerhardt, until now my program code still failed to connect to the server. Previously I’ve updated my code. I have changed my code according to the program code you typed. The following link contains the program code and screenshot of my serial monitor. Previously, if anyone was confused in the comments section of the program code, I used Indonesian and English in the program code. I’m using Arduino IDE, Xampp, and sublime text applications. Thank you so much.
https://drive.google.com/drive/folders/1PthFY_LZ2JrtYSCJiaYCdpUbPqyfjJWR?usp=sharing