Yes, there must be something wrong. You should not see the “GET” and “HTTP/1.0” part of your message in the acknowledge, only the “/drive-neu/php/v-control-test.php?test=Value2” part.
Is your parameter P1 = “/drive-neu/php/v-control-test.php” or “drive-neu/php/v-control-test.php”
try to remove the space between ” HTTP/1.0 ” and + chr(13)
change
” HTTP/1.0 ” + chr(13)
into
” HTTP/1.0” + chr(13)