File could not be written to cache error
I am using ADODB Stream to display a PDF from a secure site to the browser. The pdf will open on some machines, but not others. Both are running Windows XP pro, and IE 6.0 The error I recieve is IE cannot download xxx The file could not be written to the cache. Does anyone have any suggestions on what may be configured to allow the download? The code to display the file is below:
thank you
Dim oStream, retFile
Set oStream = Server.CreateObject( "ADODB.Stream" ) ' Create the object
oStream.Open
oStream.Type = 1
oStream.LoadFromFile strFilePath
retFile = oStream.Read
Response.BinaryWrite retFile
oStream.Close
Set oStream = Nothing
thank you
Dim oStream, retFile
Set oStream = Server.CreateObject( "ADODB.Stream" ) ' Create the object
oStream.Open
oStream.Type = 1
oStream.LoadFromFile strFilePath
retFile = oStream.Read
Response.BinaryWrite retFile
oStream.Close
Set oStream = Nothing
kevp75
sure...make sure Adobe Acrobat Reader is installed on the machines that can't open it....
SSL+ "pragma:no-cache or cache-control:no-cache" in HTTP response headers + IE6 "Tools->Internet Options->Advanced->Do not save encrypted pages to disk" causes this.
Myself, I would try swapping pragma:no-cache to cache-control:private. Or if your PDF files don't contain "personal data" then don't bother with no-cache directives at all, just put a reasonable expiry time on it like 5 minutes.
--
Lee
Myself, I would try swapping pragma:no-cache to cache-control:private. Or if your PDF files don't contain "personal data" then don't bother with no-cache directives at all, just put a reasonable expiry time on it like 5 minutes.
--
Lee
ASKER
Advanced->Do not save encrypted pages to disk -- I have tried this already... this is the one solution I have been able to find, and it still does not work. I should have mentioned that.. sorry.. Also I just tried on Firefox, and it works fine there. So far it seems to be isolated to IE 6.0, and Safari for windows.
Lee:
Can you please elaborate on what you mean by swapping pragma:no-cache to cache-control:private??
The PDF files do contain information that is secure, so if you have a suggestion on how I can transfer them in another method to the browser, that would be great. They are physically located in a directory outside my web site.
D:\website
D:\webfiles
And I do have Adobe Reader installed on this machine. I also have adobe 7.0 standard
Thank you..
Lee:
Can you please elaborate on what you mean by swapping pragma:no-cache to cache-control:private??
The PDF files do contain information that is secure, so if you have a suggestion on how I can transfer them in another method to the browser, that would be great. They are physically located in a directory outside my web site.
D:\website
D:\webfiles
And I do have Adobe Reader installed on this machine. I also have adobe 7.0 standard
Thank you..
Sorry, just to make sure - "do not save encrypted pages to disk" needs to be unchecked. I assume you tried both though.
RE: no-cache -> Do you know what HTTP Response Headers are present? You may need a tool to find out such as http://www.blunck.se/iehttpheaders/iehttpheaders.html.
--
Lee
RE: no-cache -> Do you know what HTTP Response Headers are present? You may need a tool to find out such as http://www.blunck.se/iehttpheaders/iehttpheaders.html.
--
Lee
ASKER
Lee:
here is what I got:
GET /PATH/getFile.asp?119 HTTP/1.1
Accept: */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
Host: www.xxx.org
Connection: Keep-Alive
Cookie: ZDA0NTYIBATBKZKDEKCIEVXEKV
ASPSESSIONIDSSQCQACS=IBMB
HTTP/1.1 200 OK
Date: Thu, 23 Aug 2007 15:17:14 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Pragma: no-cache
Cache-control: private
Expires: 0
Pragma: no-cache
Cache-control: private
Expires: 0
Content-Length: 473821
Content-Type: application/pdf
Cache-control: private
thanks!
here is what I got:
GET /PATH/getFile.asp?119 HTTP/1.1
Accept: */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
Host: www.xxx.org
Connection: Keep-Alive
Cookie: ZDA0NTYIBATBKZKDEKCIEVXEKV
ASPSESSIONIDSSQCQACS=IBMB
HTTP/1.1 200 OK
Date: Thu, 23 Aug 2007 15:17:14 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Pragma: no-cache
Cache-control: private
Expires: 0
Pragma: no-cache
Cache-control: private
Expires: 0
Content-Length: 473821
Content-Type: application/pdf
Cache-control: private
thanks!
So, something somewhere is setting the response header "Pragma: no-cache", twice in fact. And Expires: 0 (immediately).
Cache-control: private - should not cause any problems.
Because it's there twice, it seems to be that there are two different points in the system where they are being added. One is likely to be IIS, the other could be either by some ASP.NET configuration setting (or default) or maybe that's being done programatically. Unfortunately they will all need removing to test this.
--
Lee
Cache-control: private - should not cause any problems.
Because it's there twice, it seems to be that there are two different points in the system where they are being added. One is likely to be IIS, the other could be either by some ASP.NET configuration setting (or default) or maybe that's being done programatically. Unfortunately they will all need removing to test this.
--
Lee
ASKER
Lee:
I obtained the header info from the other PC that works, and here is what I got:
works:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1)
Does not work:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
the difference I see is the last entry:
InfoPath.1 and
.NET CLR 2.0.50727
Is that the .net runtime I have installed? Or is it anything that may be the cause? It was the only difference I noticed in the header. The machine that works displayed the no cache twice too, and the pdf still opens...
thanks again for the help...
I obtained the header info from the other PC that works, and here is what I got:
works:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1)
Does not work:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
the difference I see is the last entry:
InfoPath.1 and
.NET CLR 2.0.50727
Is that the .net runtime I have installed? Or is it anything that may be the cause? It was the only difference I noticed in the header. The machine that works displayed the no cache twice too, and the pdf still opens...
thanks again for the help...
Hmm, having two .net runtimes shouldn't interfere, unless one is perhaps corrupt. Not sure what InfoPath.1 means though, but obviously not the problem.
Another thing I didn't think of is that one of your machines might have a full cache. Try emptying the tempory internet files folder.
--
Lee
Another thing I didn't think of is that one of your machines might have a full cache. Try emptying the tempory internet files folder.
--
Lee
ASKER
I have tried emptying the tempory files.
I am also looking to see where the content is set to expire, and content experation is disabled on IIS. For configuring IIS, is there another location besides the HTTP Headers tab to set expiration? I also don't see any settings in the code to set expiration... This is not my application, so I am trying to figure out what someone else did.
thanks...
I am also looking to see where the content is set to expire, and content experation is disabled on IIS. For configuring IIS, is there another location besides the HTTP Headers tab to set expiration? I also don't see any settings in the code to set expiration... This is not my application, so I am trying to figure out what someone else did.
thanks...
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