[pmwiki-users] Suggestion: $PostTargetUrl-Variable

Nils Knappmeier nk at knappi.org
Thu Sep 21 11:50:18 CDT 2006

> For now, I think that if we have a $PostTargetUrl, it should be
> established by convention as opposed to being designated in the core.
> I.e., recipes can easily do:
>     SDV($PostTargetUrl, $ScriptUrl);
> But I really don't think we need or should have a separate variable for
> this -- see below...
Well, I think I have now done it without the $PostTargetUrl. It really 
_is_ unnecessary.
It also works, when I use the $PageUrl with FmtPageName instead of 
$ScriptUrl, so that the path information is appended.


>> The reason is simple: A lot of recipes (at least my AddDeleteLine and 
>> MailForm) use POST-requests, then process the data and perform a 
>> redirect back to  the BrowseHandler of the page. When you use CleanUrls, 
>> it does not work, e.g. on pmwiki.org, to do a
>>  <form target='http://pmwiki.org/wiki' method='post'>...</form>
>> because the rewrite engine will redirect the request to something like 
>> http://pmwiki.org/wiki/pmwiki.php, which results in the loss of all 
>> POST-variables.
> Actually, this isn't precisely true in many respects.  First, 
> using mod_rewrite with CleanUrls (as described in the Cookbook)
> does *not* cause a redirect or lose POST variables.  If it did, then
> nobody would be able to post edits or enter passwords when using
> CleanUrls, and clearly that's not the case.  
> There may be some sites that have mod_rewrite configured to do
> things using browser redirects instead of local rewrites, but I think 
> those ought to be the exception and not the rule, and then I'm 
> very curious to know how they're getting other things in PmWiki to
> work.
> I also want to note in passing that
>    <form action='http://www.pmwiki.org/wiki' method='post'>...</form>
> works just fine with pmwiki.org.  (pmwiki.org isn't using mod_rewrite.
> Even if it were, the above would work.)
>> Since such a variable might be of use for a number of recipes, I would 
>> suggest adding it to the core of PmWiki.
> It seems to me that a recipe that wants to do POST should be able
> to do exactly what PmWiki does when it performs POST operations.
> If that's not the case, then I'm curious to know why things are
> different for the recipe.
> Lastly, we already have at least five PITS items open that are trying 
> to "fix" perceived problems with $ScriptUrl:
>     http://www.pmwiki.org/wiki/PITS/00526
>     http://www.pmwiki.org/wiki/PITS/00527
>     http://www.pmwiki.org/wiki/PITS/00595
>     http://www.pmwiki.org/wiki/PITS/00619
>     http://www.pmwiki.org/wiki/PITS/00764
> I'd much prefer to come up with a solution that addresses all of
> the problems, rather than come up with separate variables that
> has to be set and maintained for each.
> Pm

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