On Mon, 22 Apr 2002, Vicki Brown wrote:
> One of my calls to the "remote CGI" returns a raw JPEG
>
> my $ua = new LWP::UserAgent;
> my $req;
> if ($port == 80) {
> $req = new HTTP::Request GET => "http://$host$doc";;
> } else {
> $req = new HTTP::Request GET => "http://$host:$port/$doc";;
> }
>
> my $response=$ua->request($req); # hash ref; HTTP::Response object
> $resp=$response->as_string;
> $hdrs=$response->headers->as_string();
> if ($response->is_success) {
> $resp=$response->content();
> }
>
> Headers ($hdrs):
> Connection: close
> Date: Tue, 23 Apr 2002 04:56:29 GMT
> Server: Apache/1.3.6 (Unix) ApacheJServ/1.0
> Content-Length: 11093
> Content-Type: image/jpeg
> Client-Date: Tue, 23 Apr 2002 05:02:38 GMT
> Client-Peer: 10.0.0.4:80
> Content-Disposition: inline; filename="UFkit7.jpg"
> Content-Transfer-Encoding: binary
> MIME-Version: 1.0
>
> Response ($resp):
> a bunch of binary stuff
>
> When the result is HTML I just print it to the new page. But this isn't
> HTML; I can't wrap it in <HTML...</HTML> tags. I can't simply print it (the
> CGI at _my_ end gives an error).
>
> Is there a convention for handling returns of binary image data?
>
> The person who "owns" the CGI that sends me the binary stream says:
> We normally handle these by returning a page with the
> correct "Content-length:.." and "Content-type: ..." which the browser
> is supposed to interpret and display accordingly.
>
> I guess I'm "the browser" in this case. It may be that the flaw is in "my"
> CGI (the
> one I'm working with; I didn't write it) in its inability to handle a page
> consisting of a simple
> print $resp;
>
> I get an error in the Apache log
> malformed header from script. Bad header=����:
>
> I believe it. JPEG binary code does not make a well-formed HTML header...
Your CGI script needs to print its own headers (most importantly,
Content-Type), then a blank line, then the JPEG data.
print "Content-Type: " . $response->header('Content-Type') . "\r\n";
print "\r\n"; # blank line ends the headers
print "$resp";
--
Liam Quinn
