[Mapserver-users] Sending image to stdout under Apache

[Lowell Filak]

I'm not sure it's difficult, it was just never the original intent used
for the design.
I think the original goal for MS was to have something that worked.
Lowell F.

The following message was sent by Dana Quinn <dana at nextbus.com> on Thu, 06 Mar 2003 09:42:05 -0800.

> 
> So this is mainly a problem because it's difficult
> to output directly to the browser when using mod_perl?
> (difficult to make sure your content header goes to the
> browser first, and then the actual image?)
> 
> it's hard to believe there isn't a straightforward way
> to make this happen in mod_perl.
> 
> dana
> 
> Lowell Filak wrote:
> > In an attempt to sum this thread up (hopefully correctly, but open for
> > corrections):
> > If using mod_perl you can't send the image binary to STDOUT because the
> > binary can reach the browser before the content-type does or does not
> > reach it at all because the content-type is sent to the browser via
> > 'print "..."' and print is guaranteed to make it but the C STDOUT is
> > not directly tied to the socket the client request came in on so STDOUT
> > is not guaranteed to make it.
> > If using the Perl script as a cgi then the '$img->saveImage...' should
> > work because STDOUT for that process is directly tied to the client
> > connection.
> > The OUT descriptor I found was a mistake on my part.
> > OUT is actually part of embperl - more on this in a minute.
> > By using OUT or JUNK or any descriptor name in a print statement that is 
> > not declared will automatically print to STDOUT - Perl is based around
> > language, ie. "You right what u think you want it to due & ..." - that
> > is why the test I ran outside of mod_perl worked.
> > Back to OUT & gd.pm:
> > As Eric pointed out some modules contain a way to assure that a method
> > call intended for STDOUT is sent to the same place as a 'print' to
> > STDOUT even under mod_perl.
> > Jason proposed taking a look at setting something such as this up for
> > mapscript.pm, which as I understand it requires mapscript.pm create a
> > filehandle (such as OUT) and tie it to STDOUT itself without relying on
> > mod_perl to do it.
> > Clear as mud.?
> > At this point it appears it would be a good thing to
> > have if the developer(s) approve(s) (Steve, thoughts?).
> > Lowell F.
> 
> 
> 
> -- 
> 
> Dana Quinn, dana at nextbus.com
> NextBus Information Systems
> (510) 420-3117