I have a strange problem when using TSEND_C.

Use the data string: 'GET /service/php/g1_submit.php?1=999&2=&3=250 HTTP/1.1$R$LHost: localhost$R$LConnection: close$R$L$R$L'

in apache's connection log i get: "\xfe^GET /service/php/g1_submit.php?1=999&2=&3=250 HTTP/1.1" 400 0 "-" "-"

The fifth character in the connect string changes, but the first four are always: \xfe

My thoughts are it might be related to character encoding, but am not sure, and do not know how to change this in TIA.

Any help appreciated.

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Split from http request from S7-1200 to external web server.

Hi,

In your plc program, you are probably storing the 'GET /service ....' text in a "string" variable.

The way the plc defines a string is by having a word in front of the actual text. The first byte in the word is the maximum length of the string and the second byte is the current length.

What I think happens is that you call TSEND_C and points directly to the string variable.

This means that it sends the word with the length info followed by the text.

This is what you see in the apache log. The "\xfe^GET" is apaches way of saying it received a char that it could not display so it logs its hex value "\xfe" (\x means now follows a hex value). The "fe" is the max length of the string which is 254.

The "^" is the current length of the string, expressed as a character.

You need to change TSEND_C to not include the first word.