code: function getHeaderValue(sHeaders, sHeaderName) {
  		var i,
  			aHeaderParts,
  			aHeaders = sHeaders.split("\r\n");
  
  		for (i = 0; i < aHeaders.length; i += 1) {
  			aHeaderParts = aHeaders[i].split(":");
  
  			if (aHeaderParts[0].toLowerCase().trim() === sHeaderName) {
  				return aHeaderParts[1].trim();
  			}
  		}
  	}
docs: Returns value of the header with the specified <code>sHeaderName</code> from
  the specified <code>sHeaders</code> section of MIME part.
  
  @param {string} sHeaders
  Section of MIME part representing HTTP headers
  @param {string} sHeaderName
  Name of HTTP header in lower case
  @returns {string} The HTTP header value