XMLHttpRequest getResponseHeader() Method

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# XMLHttpRequest getResponseHeader() Method

Complete XMLHttpRequest Object Reference

## Definition and Usage

The getResponseHeader() method gets a string containing a specific response header of the XMLHttpRequest object.

A response header contains file information like length, server-type, content-type, date-modified, etc.

## Syntax

    xmlHttp.getResponseHeader(header)

Parameter | Description
--- | ---
name | A string that specifies the name of the header to get. Use the getAllResponseHeaders() method to find the possible header names for the specific document.

## Example

The following code outputs the "Content-Length" header in a HTML element with id="header":

    <html>
    <body>

    <span id="header"></span>

    <script type="text/javascript">
    xmlhttp=null;
    if (window.XMLHttpRequest)
      {// code for Firefox, Mozilla, IE7, etc.
      xmlhttp=new XMLHttpRequest();
      }
    else if (window.ActiveXObject)
      {// code for IE6, IE5
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    if (xmlhttp!=null)
      {
      xmlhttp.onreadystatechange = function()
        {
        if(xmlhttp.readyState == 4)
          {
          x=xmlhttp.getResponseHeader("Content-Length");
          document.getElementById("header").innerHTML=x;
          }
        }
      xmlhttp.open("GET", "note.xml", true);
      xmlhttp.send(null);
      }
    else
      {
      alert("Your browser does not support XMLHTTP.");
      }
    </script>
    </body>
    </html>

Output:

    195

## Try-It-Yourself Demos

getResponseHeader()
Get the "Last-Modified" response header from a XMLHttpRequest object

Complete XMLHttpRequest Object Reference

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