Decode

Question

how do i Knowles what post un URL and how to décode them

Answer 1

To map the wide range of characters used worldwide into the 60 or so allowed characters in a URI, a two-step process is used:
Convert the character string into a sequence of bytes using the UTF-8 encoding.Convert each byte that is not an ASCII letter or digit to %HH, where HH is the hexadecimal value of the byte.
https://www.w3schools.com/jsref/jsref_decodeuricomponent.asp
https://stackoverflow.com/questions/6138127/how-to-do-url-decoding-in-java