Re : Issues regarding to Client class

I assume that the sketch throws an exception when attempting to access the webserver when it is unavailable.

Java prvides the try-catch construct which will catch an exception and allow the user to decide what to do with it.

Very basic example of using this construct e.g.

1. void setup() {
2.   try {
3.     // code that might throw an exception
4.     int x = 7/0; // division by zero is not permitted
5.   }
6.   catch(Exception e) {
7.     // an exception was thrown so decide what to do with it
8.     String className =  e.getClass().getSimpleName();
9.     println("Name of exception class: " + className);
10.     println("Division by zero is not permitted");
11.   }
12. }