On Tuesday 18 March 2008, Aschwin Wesselius wrote:
> Point is: why hitting you webserver with multiple requests per user,
> just after submitting a form or whatever caused the redirect? If you
> have 2 users per day, that won't hurt. But if you have 30.000 concurrent
> users a minute, that could be 60.000 requests (besides all the images,
> stylesheets, javascripts that are being re-requested). Or am I talking
> nonsense?
If you send a redirect header, that gets sent before any HTML gets sent so no
JS or images are sent either. The payload cost of a redirect is trivial.
The cost of the second bootstrap process may or may not be problematic. You
have to trade that off against the code simplification you can get out of
redirects (or the code complication you can get if you use it stupidly).
Take for instance Drupal (which I use as an example because I'm a core dev for
it). Drupal does a redirect at the end of every form submission. That
redirect is controllable; it could go back to the form ("submit to self"), or
to a thank you page, or the home page, or to a page in the system that you
just created, or any number of other places. That flexibility is worth the
cost of the second bootstrap (and Drupal's bootstrap is admittedly not
small), especially because the vast majority of Drupal sites and PHP sites in
general are read-heavy, not write-heavy, so it's not a substantial number of
additional bootstraps. It also means that if the user hits reload, they
don't resubmit the form because they're not "on" the POST-requested page.
I will say in general you should not ever have more than one redirect chained
together. While there may be valid reasons for it conceptually, trying to
trace and debug that workflow is overshadow any advantage it could otherwise
offer. (IMO, YMMV, etc.)
--
Larry Garfield AIM: LOLG42
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