Question

Getting a browser to cache an ASP by configuring IIS / ASP

Asked by: just1coder

I am having a heck of a time getting a 304 from a classic ASP on IIS 6.0

This is my very basic page but I always get a 200OK. I have IIS setup to enable page expiration and have the headers set manually.

<%
Response.Buffer = True
Response.AddHeader "Last-Modified", DateToHTTPDate(Now()-1)
Response.AddHeader "Cache-Control", "public"
Response.CacheControl = "public"
Response.Expires = 1
%>
<%
response.write("Hello")
%>
<%
'Converts date (19991022 11:08:38)
'to http form (Fri, 22 Oct 1999 12:08:38 GMT)
function DateToHTTPDate(ByVal OleDATE)
  Const GMTdiff = #01:00:00#
  OleDATE = OleDATE + GMTdiff
      DateToHTTPDate = engWeekDayName(OleDATE) & _
      ", " & Right("0" & Day(OleDATE),2) & " " & engMonthName(OleDATE) & _
      " " & Year(OleDATE) & " " & Right("0" & Hour(OleDATE),2) & _
      ":" & Right("0" & Minute(OleDATE),2) & ":" & Right("0" & Second(OleDATE),2) & " GMT"
End Function

Function engWeekDayName(dt)
      Dim Out
      Select Case WeekDay(dt,1)
            Case 1:Out="Sun"
            Case 2:Out="Mon"
            Case 3:Out="Tue"
            Case 4:Out="Wed"
            Case 5:Out="Thu"
            Case 6:Out="Fri"
            Case 7:Out="Sat"
      End Select
      engWeekDayName = Out
End Function

Function engMonthName(dt)
      Dim Out
      Select Case Month(dt)
            Case 1:Out="Jan"
            Case 2:Out="Feb"
            Case 3:Out="Mar"
            Case 4:Out="Apr"
            Case 5:Out="May"
            Case 6:Out="Jun"
            Case 7:Out="Jul"
            Case 8:Out="Aug"
            Case 9:Out="Sep"
            Case 10:Out="Oct"
            Case 11:Out="Nov"
            Case 12:Out="Dec"
      End Select
      engMonthName = Out
End Function
%>

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Asked On
2007-03-14 at 06:59:04ID22448649
Tags

iis

,

asp

,

classic

Topics

Microsoft IIS Web Server

,

Active Server Pages (ASP)

Participating Experts
2
Points
125
Comments
10

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Answers

 

by: just1coderPosted on 2007-03-14 at 07:40:15ID: 18718739

I can get a .htm file to 304 without any trouble of course too...

 

by: karlsfrePosted on 2007-03-14 at 07:46:20ID: 18718797

I do not see anywhere in your code that you actually return a 304 response.

What you probably want to do is to set the Response.Expires to a date/time slightly in the future. For example now + 30 minutes. That way the browser will keep the page cached, and will not even make a request for the page, until the page is 30 minutes old in the cache. Note that the Expires header must be a date. Setting Expires=1 does not really mean anything.

Otherwise, you must change your code to read the If-Modified-Since request header, which is the time that the browser downloaded the page last. Your code must then decide if the page has changed since that time. If the page has not changed your code should return a 304 using Response.StatusCode=304.

 

by: just1coderPosted on 2007-03-14 at 08:01:08ID: 18718925

THanks, I will give that a shot...

 

by: just1coderPosted on 2007-03-14 at 08:05:45ID: 18718969

 

by: karlsfrePosted on 2007-03-14 at 08:08:37ID: 18718990

Unfortunately there is no way to automatically set up the 304 response. As you are creating a dynamic page your code in the page can change the content of the page at any time.

With a static HTML page IIS can automatically compare the date in If-Modified-Since to the timestamp on the HTML file. If the HTML file has not changed since, then IIS can safely return a 304, because the page has not changed.

With a dynamic page you might read stuff from a database and display in the page. IIS cannot know when the database was last changed, and so it cannot know if the page has changed.

One other thing, you can set up the Expires header in IIS. That is normally the best place, if you always want to use the same Expires value. Go into the IIS manager, and right click the page or folder you want to cache. Click on the HTTP Headers tab. There you can set all responses from this page or folder to be cached for a certain time.

 

by: GERENTEPosted on 2007-03-14 at 08:10:05ID: 18719006

 

by: just1coderPosted on 2007-03-14 at 08:28:04ID: 18719195

So, really the best (only) option here would be to check the IMS request in the header and compare it to a date I set in the ASP. The send the appropriate response (200 or 304)...

 

by: just1coderPosted on 2007-03-14 at 08:38:04ID: 18719303

Any examples of this out here you know of by chance?

 

by: karlsfrePosted on 2007-03-14 at 08:44:34ID: 18719360

Here is an example for reading a file from the server:

http://www.motobit.com/tips/detpg_net-last-modified/

 

by: just1coderPosted on 2007-03-14 at 08:52:45ID: 18719448

Thanks Karlsfre - anything in classic ASP?

20120131-EE-VQP-002

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