> -----Original Message-----
>
> What are you using in showImage.html to print the image? If you're
> doing it manually, then put "print 'Content-Type: image/jpeg\n" at the
> top of the file (w/ a double "\n" at end of header). If using CGI.pm,
> then it's as simple as "print header(-type=>'image/jpeg')" or
> equivalent. If it's an Apache::* module, then there's a similar
> interface, and so on. More than likely what really matters is what
> showImage.html is doing (and/or not).
> --
> Shaun Fryer
> http://sourcery.ca/
>
> On Thu, Jul 2, 2009 at 3:11 PM, Hellman,
> Matthew<Hellman.Matthew@principal.com> wrote:
> > I don't think that's it's a web server thing, because he's
dynamically
> generating the images and not using a .jpg extension. Doing it this
way
> allows you do such things as resize the image on the fly using URL
> parameters. Something like:
> >
> > src="/images/showImage.html?imageid=123456&size=800x600
> >
> > the HTTP response headers would probably shed the most light on the
> problem, nudge, nudge;-)
> >
> >>>-----Original Message-----
> >>>From: Gunnar Hjalmarsson [mailto:noreply@gunnar.cc]
> >>>Sent: Thursday, July 02, 2009 1:24 PM
> >>>To: beginners-cgi@perl.org
> >>>Subject: Re: content type headers
> >>>
> >>>Hellman, Matthew wrote:
> >>>> The answer to your problem seems to be making sure one and only
one
> >>>> content-type header is returned with the image, and that it has
the
> >>>> correct value (e.g. Content-Type: image/jpeg or whatever).
> >>>
> >>>Right, and it just struck me that this is probably a web server
> >>>configuration issue. A sensibly configured server should send the
> >>>correct content-type header out from the file extension.
> >>>
> >>>Please see the attached file, which is the config file for this
> purpose
> >>>on my own (Apache) server. There you can see that a jpg extension
> >>>results in content-type image/jpeg, a png extension gives image/png
> etc.
Thanx for all the replies.
I must say this list is quite slow compared to others.
Matthew is correct. I used the FF live-headers add-on and the section
for the /images/showImage.html was Content-Type text/html.
As for how the page is generated and images displayed, it's a bit
involved. The whole application is a mod_perl wrapper and templating
system. The showImage.html page is one line that reads as follows:
<%- httpContentType('image/jpeg')%><%= ModName::outputImage(
cgiParam('imageid'))%>
I have tried to go throught the code and find out what sub-class the
httpContentType is but my efforts to hack the code and force the correct
content_type have failed. cgiParma is a sub-class of CGI.
I'm in a pickle because the consequences of this bug are far-reaching.
I'm not in a position to throw out the whole mod_perl application and I
can't think of a way to serve the content that is not htmh from another
handler.
Below is an extract from the mod_perl handler that should be setting the
content type, I have commented out my hack as it didn't work ;-(
Thanx,
Dp.
sub handler
{
# THIS IS THE IMPORTANT FUNCTION
my($apache)=@_;
my $asperl;
if($apache->dir_config('ProjectName') &&
defined($OBJECT{$apache->dir_config('ProjectName')}) &&
ref($OBJECT{$apache->dir_config('ProjectName')}))
{
$asperl=$OBJECT{$apache->dir_config('ProjectName')};
}
else
{
$asperl=$OBJECT{"DEFAULT"};
}
if($apache->dir_config("ServerPort"))
{
$ENV{"SERVER_PORT"}=80;
}
my $data;
# initialise the ASPerl object for this request
my $fname=$apache->filename();
$asperl->{"Request"}=$apache;
# finish initialising the ASPerl object
if(handleThisRequest($asperl,$fname))
{
# we've decided that we want to handle this, so run it through
the ASPerl engine.
$asperl->{"ReturnCode"}=OK;
$asperl->{"CGI"}=new CGI;
# my %media_hacks = (
# 'showImage.html' => 'image/jpeg',
# );
# if (exists $media_hacks{basename($fname)}) {
# print STDERR "Forcing content_type to
$media_hacks{basename($fname)}\n";
# $asperl->setContentType($media_hacks{basename($fname)});
# $asperl->{'Request'}->content_type(
$media_hacks{basename($fname)} );
# $asperl->{'Request'}->header_out( "Content-Type"
=>$media_hacks{basename($fname)} );
# }
# else {
# print STDERR "The current type for request to $fname is
".$apache->content_type()." The ASPerl is
".$asperl->{'ContentType'}."\n";
# print STDERR "ContentType for $fname is now
".$asperl->{'Request'}->content_type."\n";
# }
$asperl->setContentType($apache->content_type());
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