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From "Abid Hussain" <abid.huss...@dilax.com>
Subject AW: RE: RE: Ignore http header if-modified-since
Date Thu, 17 Dec 2009 14:46:43 GMT
Hi,

this is interesting. As you see in my example (i put it again below), 
tomcat itself delivers the Last-Modified (Do, 17 Dez 2009 11:11:29 GMT) 
in a different locale (german) as the Date Header (Thu, 17 Dec 2009 
11:24:53 GMT).

So maybe the simplest way is to prevent tomcat from putting the 
"Last-Modified" Header into the response. Do I have to use a Filter to 
do so or can this be done by another way (by configuration, ...)?

Best regards,

Abid

--> Successful Request:
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.6)
Gecko/20091201 Firefox/3.5.6 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de-de,en-us;q=0.8,de;q=0.6,en;q=0.4,fr-fr;q=0.2
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Cookie: JSESSIONID=262FAFFC220AF50656BC67C1C1DD1331
Cache-Control: max-age=0
--> Response:
Server: Apache-Coyote/1.1
Last-Modified: Do, 17 Dez 2009 11:11:29 GMT
Content-Type: text/javascript
Transfer-Encoding: chunked
Date: Thu, 17 Dec 2009 11:24:53 GMT

-----Urspr√ľngliche Nachricht-----
Von: Looijmans, Mike [mailto:mike.looijmans@oce.com] 
Gesendet: Donnerstag, 17. Dezember 2009 15:03
An: Tomcat Users List
Betreff: RE: RE: Ignore http header if-modified-since

This header is invalid:

Last-Modified: Do, 17 Dez 2009 11:11:29 GMT 

This is not according to spec, "Dez" should be "Dec". Maybe tomcat 
chokes on it.


> -----Original Message-----
> From: Abid Hussain [mailto:abid.hussain@dilax.com]
> Sent: donderdag 17 december 2009 12:26
> To: users
> Subject: AW: RE: Ignore http header if-modified-since
> 
> Hallo,
> 
> unfortunately it is a 404. And the 404 is only delivered when the 
> request header contains "if-modified-since". If not the request is 
> respondec correctly. This behaviour is reproducable.
> 
> Below you find an example of failed and successful request. 
> The GET URL is in both cases
> http://localhost:8080/mywebapp/faces/static/META-INF/progressb
ar/script.js
> 
> --> Failed Request (means tomcat responds with 404):
> Host: localhost:8080
> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.6)
> Gecko/20091201 Firefox/3.5.6 (.NET CLR 3.5.30729)
> Accept: 
> text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
> Accept-Language: de-de,en-us;q=0.8,de;q=0.6,en;q=0.4,fr-fr;q=0.2
> Accept-Encoding: gzip,deflate
> Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
> Keep-Alive: 300
> Connection: keep-alive
> Cookie: JSESSIONID=262FAFFC220AF50656BC67C1C1DD1331
> If-Modified-Since: Do, 17 Dez 2009 11:11:29 GMT
> Cache-Control: max-age=0
> --> Response:
> Server: Apache-Coyote/1.1
> Content-Type: text/html
> Content-Length: 1093
> Date: Thu, 17 Dec 2009 11:24:38 GMT
> 
> --> Successful:
> Host: localhost:8080
> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.6)
> Gecko/20091201 Firefox/3.5.6 (.NET CLR 3.5.30729)
> Accept: 
> text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
> Accept-Language: de-de,en-us;q=0.8,de;q=0.6,en;q=0.4,fr-fr;q=0.2
> Accept-Encoding: gzip,deflate
> Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
> Keep-Alive: 300
> Connection: keep-alive
> Cookie: JSESSIONID=262FAFFC220AF50656BC67C1C1DD1331
> Cache-Control: max-age=0
> --> Response:
> Server: Apache-Coyote/1.1
> Last-Modified: Do, 17 Dez 2009 11:11:29 GMT
> Content-Type: text/javascript
> Transfer-Encoding: chunked
> Date: Thu, 17 Dec 2009 11:24:53 GMT
> 
> Does anybody have an explanation for this?
> 
> Best regards,
> 
> Abid
> 
> 
> -----Urspr√ľngliche Nachricht-----
> Von: Looijmans, Mike [mailto:mike.looijmans@oce.com]
> Gesendet: Mittwoch, 16. Dezember 2009 15:48
> An: Tomcat Users List
> Betreff: RE: Ignore http header if-modified-since
> 
> I assume you mean 304 (Not modified) instead of 404 (Not found).
> 
> Simplest I can think of is to NOT put the "last-modified" 
> header in your response. Then the browser won't send you an 
> if-modified-since back.
> 
> On the other hand, if you can put a datestamp on the response
> - e.g. a file date or by reading it from a DB or so - provide the 
> proper response and you get client-side caching for
> (almost) free, which can seriously reduce load on a server.
> 
> M.
> 
> > -----Original Message-----
> > From: Abid Hussain [mailto:abid.hussain@dilax.com]
> > Sent: woensdag 16 december 2009 14:11
> > To: users
> > Subject: Ignore http header if-modified-since
> > 
> > Hallo,
> >  
> > when processing ajax-requests Tomcat sometimes responds with a 404 
> > instead of delivering XML.
> >  
> > This seems to happen when the http header "if-modified-since" 
> > in the request doesn't somehow contain "the right" value. 
> At least, if
> 
> > the request doesn't contain this header, tomcat responds
> "correctly".
> > 
> > Is it possible to instruct tomcat to simply ignore this
> header so that
> 
> > the correct response will be delivered, whatever is
> contained in this
> > header?
> > 
> > Best regards,
> > 
> > Abid
> 
> (EOF)
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