Talk:Prevent caching of a JSP output

Caching of JSP output? ... as far as I know, JSP pages are compiled to servlets at the end of story... and saying JSP output caching would have to be related then to output stream caching (and we very want to have it here), anyway everyone know that it's about information transported within HTTP protocol that can be used by applications handling data exchange via mentioned protocol. Thing about JSPs and actually web page content (not only HTML, it can be image , text or anything else) caching is not that straight for real, caching can be done in many layers of transport model, lets imagine that we have: - server - proxy - client browser ( here it is also important what is the type of browser (IE,Gecko,WebKit etc. , they all try to apply standards, but if you start creating complicated software - difference will come out.) The most annoying caching is done via proxy servers (to decrease data transfers - typically in modem connection providers), in proxy "they" try generally to review HTTP headers and also data content (that last one isn't even legal in some countries). Browsers react with HTTP headers and content, but generally there is an order: HTML headers have higher priority than HTTP.

This article should rather be about "How to omit caching." - which is for real much more difficult task.

--86.163.174.232 17:41, 27 November 2008 (UTC)

yep, i missed subject little, it IS actually about preventing cache of web pages. Basically, solution (the best in my opinion) is to operate on fake URI/URL changes (creating fake extensions that point to the same place or fake parameters), and (it might be surprising) setting all cache headers to "true" - we will control everything from one place then.

--86.163.174.232 17:48, 27 November 2008 (UTC)

"Pragma" basically is deprecated and unofficial, better:

<meta http-equiv="CACHE-CONTROL" content="no-cache"/>

Anyway using two HEADERS is a scandal (!) , DOM tree is damaged then.

--86.163.174.232 17:54, 27 November 2008 (UTC)

Hi 86.163.174.232, (could you sign with a name or an nickname if that's not 86.163.174.232? )

I don't know in the specific why in this case adding a second head solves, I feel that's a work around to some bug found by Rgagnon so it comes from experience.

I've come along with similar situations myself, in which you have to break the rules to make things work.

Sometimes when you find a bug in a program you don't always have the time or the authority to fix it. thus you need to invent a workaround. That's where lateral thinking comes along.

--DonGiulio 09:58, 28 November 2008 (UTC)

Alakazaam-information found, problem solved, thakns!

--Dernell 23:48, 17 August 2011 (PDT)

Woah nelly, how about them aeplps!

--Cathy 14:53, 18 August 2011 (PDT)

This piece was cogent, well-wrttien, and pithy.

--Christina 15:23, 18 August 2011 (PDT)