Adding custom HTTP headers using JavaScript

Question

On an HTML page  while clicking the link of an Image   img   or anchor   a   tags  I would like to add custom headers for the GET request  These links are typically for downloading dynamic content  These headers could be SAML headers or custom application specific headers    Is it possible to add these custom headers through JavaScript  Or if I add these through XMLHttpRequest  how can I achieve the download functionality   This requirement is for IE6 or 7 only

User · Answer

If you re using XHR  then setRequestHeader should work  e g   xhr setRequestHeader  custom-header    value      P S  You should use Hijax to modify the behavior of your anchors so that it works if for some reason the AJAX isn t working for your clients  like a busted script elsewhere on the page

User · Answer

As already said  the easiest way is to use querystring   But if you cannot  because of security reason  you should consider using cookies

User · Answer

The only way to add headers to a request from inside a browser is use the XmlHttpRequest setRequestHeader method   Using this with  GET  request will download the resource   The trick then is to access the resource in the intended way   Ostensibly you should be able to allow the GET response to be cacheable for a short period  hence navigation to a new URL or the creation of an IMG tag with a src url should use the cached response from the previous  GET    However that is quite likely to fail especially in IE which can be a bit of a law unto itself where the cache is concerned   Ultimately I agree with Mehrdad  use of query string is easiest and most reliable method   Another quirky alternative is use an XHR to make a request to a URL that indicates your intent to access a resource   It could respond with a session cookie which will be carried by the subsequent request for the image or link

User · Answer

I think the easiest way to accomplish it is to use querystring instead of HTTP headers

[javascript] Adding custom HTTP headers using JavaScript

Examples related to javascript

Examples related to http-headers