title: How to set Http header Fields in Objective-C?
body: <p>I want to call web service in Objetive C which returning xml data and I have to pass some information in header to the server,
  just like in javascript we can do it using jquery,  </p>
  
  <p>x.setRequestHeader('key','value');</p>
  
  <p>where x is the xmlHttpRequest Object.
  How we can pass the header data in NSConnection class,
  I used google but havent find out good solution.
  please help me. </p>