[jQuery] $ajax() problem

[jQuery] $ajax() problem


$.ajax({
                    type: "POST",
                    url: "mywebpage.aspx?Arg="+args2,
                    contentType: "text",
                    data:"{}",
                    dataType: "text",
                    success: CompleteInsert,
                    error: onFail
                });
I dont know why the onFail function is going to be executed when args2
is too big.
args2 is a string type
can anyone explain this
thanks