[TYPO3-dev] Exclude get vars from cHash check.

[Nikolas Hagelstein]

Dmitry Dulepov wrote:
> No. cHash is supposed to have all vars in it by design. Otherwise it
> is useless. 
Depends on the situation:

Imagine you got 2 plugins on one page:
 my_ext_pi1 : USER  -> Serving a Database record depending on
tx_myext_pi1[uid]
 my_ext_pi2 : USER_INT -> output depending on &tx_myext_pi2[whaterver]

Surfin that page with (assuming it has been surfed before so it is cached
already):

?id=1&tx_myext_pi1[uid]=3&cHash=xxxx (xxx = correct chash for uid=3).

would pull the page from cache and render the pi_2 (since it is user_int)
so there would be one entry for every uid value for that page.

That far that good but lets assume i would need to controll pi2 by another
heavy variating parameter if i would create a chash over :

&tx_myext_pi1[uid]=3&tx_myext_pi2[whaterver]=asdf&cHash=xxxx

I'd end up in tons of cache rows all containing the same content (everything
that changes is pi2 and it is user_int anyway).

So that is where that excludedCHash parameter comes into play: setting it to
tx_myext_pi2[whaterver] would solve that issue immediatly.

Cheers,
Nikolas