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I am getting following error

Failed to load resource: the server responded with a status of 412 (Precondition Failed)

while I try to fetch data from a text file using `$.post`
On first try web page works fine and data is loaded from file but when I refresh it is not loaded sometimes.When I deleted cache and try again it was loaded successfully.But still I think this problem is not because of cache only.First time when I loaded the page error was there showing in JS console.I am using Google Chrome.

      <div onclick="fetch_data()">click me</div>
      <h1 class="result"></h1>


  <script type="text/javascript">
      function fetch_data()
              $.post('sometext.txt', function(data)
Updated 13-Aug-13 16:39pm
virusstorm 14-Aug-13 14:44pm    
I suggest running a utility called Fiddler to inspect the HTTP traffic between your computer and the client. It sounds like a networking issue.

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