CODEWITHSUNDEEP
javascriptc#jqueryhtmlasp.net
MA9H
MA9H

Reputation: 1909

PDF in iframe cached

How to use an iframe to dynamically open multiple pdf files (one at a time according to what the client will click on) but not cache them on the client machine, because if that file content on the server got changed (added new pages to it for example), the client will still get the older version unless he/she clears the browser's cached files

Upvotes: 0

Views: 1676

Answers (3)

HCJ
HCJ

Reputation: 527

Add headers in the response to avoid caching in donwstream servers

HttpContext.Response.AppendHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
HttpContext.Response.AppendHeader("Pragma", "no-cache");
HttpContext.Response.AppendHeader("Expires", "0");

Upvotes: 2

Captain Kenpachi
Captain Kenpachi

Reputation: 7215

You will need to disable response cacheing for the files. In the case of ASP.NET MVC, it's as simple as the following:

[OutputCacheAttribute(VaryByParam = "*", Duration = 0, NoStore = true)] // will be applied to all actions in Controller, unless those actions override with their own decoration
    public class FilesController : Controller
    {
        public ActionResult GetFile(string id)
        {
             return File();//do file 
        }
    }

Upvotes: 1

PHeiberg
PHeiberg

Reputation: 29801

If you suffix the url to the pdf file with a unique query string parameter, that you change whenever the pdf file is changed, the browser will cache each version of the file separately

Example:

change http://site/myFile.pdf

to http://site/myFile.pdf?v=f955b055-d551-4762-8313-a2417dc70568

Upvotes: 4

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