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From "Abid Hussain" <abid.huss...@dilax.com>
Subject AW: RE: Ignore http header if-modified-since
Date Thu, 17 Dec 2009 11:26:11 GMT
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/progressbar/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

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