title: maximum length of post and get variable name
body: <p>What is maximum post and get variable limit?
  I am calling a page in ajax and it goes on fail function</p>
  
  <pre><code> $.ajax("data_valid.php?duplicateaccountname=a")
          .done(function(data) {
              alert(data+"data");
           })
          .fail(function() { 
              alert("error");
              dup = "error";
   });
  </code></pre>
  
  <p>but this is working </p>
  
  <pre><code>            $.ajax("data_valid.php?dup=a")
          .done(function(data) {
              alert(data+"data");
           })
          .fail(function() { 
              alert("error");
              dup = "error";
           });
  </code></pre>
  
  <p>is there is any variable name limit?</p>