Questiona about req.backend.healthy

[Marco Felettigh]

Hi ,
i'am new about Varnish and i need help understanding
req.backend.healthy .

req.backend.healthy is a state for all the backends or i can check the
healthy of a single backend ?
How can i grace only the content from a single backend ?

site1 -> be1
site2 -> be2

example:
backend be1 {
   .host = "x.x.x.x";
   .port = "80";
   .probe = {
   .url = "/index.php";
   .interval = 5s;
   .timeout = 1 s;
   .window = 5;
   .threshold = 3;
  }
}

backend be2 {
   .host = "y.y.y.y";
   .port = "80";
   .probe = {
   .url = "/index.php";
   .interval = 5s;
   .timeout = 1 s;
   .window = 5;
   .threshold = 3;
  }
}


thanks
Marco
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