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v11 Prevent HTM Files on alpha server from caching in user's browser

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    #1

    v11 Prevent HTM Files on alpha server from caching in user's browser

    Hello,

    I am new to alpha. I developed a Help system which is web based. The HTML files/images are on the alpha server. I have a Help button in my alpha application which is linked to my index.htm. We added the htm/html files to the alpha server and I opened the main page, index.htm. The newest help content loaded just fine for me and included the changes I had JUST made. However, a coworker launched the same index.htm page and received the old version, I'm assuming because his browser brought up a cached version.

    After that incident, I have included code between the <HEAD> tags in each HTML file to include a file with HTML <head> tags to not cache pages - see below code snippet.
    Code:
    <!--#include file="RefreshNoCache.html" -->
    In RefreshNoCache.html, I'm using the following code:

    Code:
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<META HTTP-EQUIV="Cache-control" CONTENT="no-cache">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="-1">
</head>
</html>
    I was told by local IT that in addition to the above code, we need to also set the CacheControlCustom property in IIS to 'no-cache' for pages we don't want cache as that will add an HTTP header for cache-control in the document. I am told by our alpha developer that she is not sure how to do this since we are not using IIS, we are using Alpha APP Server to host the application.

    Any ideas? My only other idea is to host the web-based Help HTM/HTML files on our SQL server which IS running IIS and just link to THAT location rather than location on the alpha APP server.

    Your help is MUCH appreciated!
    Tags: None
    #2
    Re: v11 Prevent HTM Files on alpha server from caching in user's browser

    Try this in your head section

    <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache" />
    <META http-equiv="expires" content="0" />
    Frank

    Tell me and I'll forget; show me and I may remember; involve me and I'll understand

    Comment

      #3
      Re: v11 Prevent HTM Files on alpha server from caching in user's browser

      You can add the following to the top of your a5w page which will add no cache commands to the response headers.
      Code:
       <%a5 Response.NoCache() %>
      Another option which is what I have switched to on my custom pages that do not use A5 AJAX grids or dialogs but will work for both is to append a unique variable to the end of the URL string. I just append a timestamp, for example: yoursite.com/page.a5w?timeStamp=20120825012545

      You can generate this timestamp with the following xbasic:
      Code:
      val(cdate(date()) + time("0h0m0s"))
      The benefit to this method is all other included files such as images, js, and css files will remained cached but the a5w page content will reload every load.
      Last edited by LukeS; August 25, 2012, 05:07 AM.

      Comment

        #4
        Re: v11 Prevent HTM Files on alpha server from caching in user's browser

        If you are running a pre-release build after 2804, there is an option to automatically add no cache to every request that requires login. That includes html files and Ajax callbacks if they require login. The option shows in the security setting in the Customize section. If a request is always allowed, it is assumed the content probably isn't time sensitive so no cache won't be applied automatically, but any of the methods suggested by Frank and Luke will work.

        Comment

          #5
          Re: v11 Prevent HTM Files on alpha server from caching in user's browser

          <!--#include file="RefreshNoCache.html" --> is ASP code and will do nothing in the Alpha server. Your RefreshNoCache.html is not being included as you think it is, so none of the meta tags are being set into your HTML document. Alpha does not have a method for including files in static documents (*.htm, *.html), so you will have to directly place the desired tags directly in each document.

          If you use A5W pages instead of static HTML documents, then you can use Response.NoCache() and/or set any other Response headers as desired.

          Lenny Forziati
          Vice President, Internet Products and Technical Services
          Alpha Software Corporation

          Comment

            #6
            Re: v11 Prevent HTM Files on alpha server from caching in user's browser

            Thank you all so very much for your replies. I am going to go with the following solution by putting the below in the head section of all htm/html files for my web help:

            <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache" />
            <META http-equiv="expires" content="0" />


            Thanks again, I really appreciate your help!

            --Kristin

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