How mix loadstring http get and normal code ?

For explain my script is like that :

loadstring(game:HttpGet("https://mywebsite.ccom/index.php", true))()
wait()
if ban == true then
print(ban)
end

the website page is :

local ban = true

And if i replace "local ban = true" by local ban = "test"

when i print ban i get "nil" in the console