Schau Dir mal den Unterschied zwischen Get und Post an:
https://www.w3schools.com/tags/ref_httpmethods.asp
Zitat von
w3schools.com:
Two HTTP Request Methods: GET and POST
Two commonly used methods for a request-response between a client and server are: GET and POST.
GET - Requests data from a specified resource
POST - Submits data to be processed to a specified resource
Und dann schaumal, was man mit
idHTTP.Post
machen kann.