Hello,

When you are using LHTTP function from "Libraries for Communication for Simatic Controllers" with TIA16, there is a bug in getting length of the HTTP header (pic of code below).

If function "LHTTP_FindStringInArray" wont find a string defined in searchFor input it will output -1 value and LEN(#HEADER_END) always returns value 4 (#HEADER_END := "$R$L$R$L). So basically in a scenario when the LHTTP_FindStringInArray wont find a string that it was searching for the tempLen will be set to 4 instead of 0, which will result in getting "#ERR_ENCODING_UNKNOWN" instead of "ERR_INVALID_HEADER"

(pic of code that catches "#ERR_ENCODING_UNKNOWN" below)

Easiest fix would be changing the if statement to: