client.read (), to form Textarea Ethernet Shield

Hello friends, I have a question regarding client.read function () Bookseller ethernet, you can read a textarea input on a form created by the same board? I have understood that if you can for a texfield but only for texts would have to be small.

Realize a small sketch to read from a text field:

#include <String.h>
#define maxLength 25
String inString = String(maxLength); 

int index1 = inString.indexOf('=');
int index2 = inString.indexOf('HTTP');
String texto = inString.substring( index1, index2 );
Serial.println();
Serial.println(texto);

Like this code does not work 100%, as can be arranged and as an official with textarea?

Greetings!