Re: Headers in fpassthru() output

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From	"M. Strobel" <sorry_no_mail_here@nowhere.dee>
Newsgroups	comp.lang.php
Subject	Re: Headers in fpassthru() output
Date	Tue, 07 Feb 2012 09:48:37 +0100
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Am 07.02.2012 03:40, schrieb Michael T. Davis:
> 	So far, I've tested a call to fopen followed by a call to fpassthru
> on a remote (http://...) JPEG file with PHP v4.4.7 in the "OSU Web Server"
> running under OpenVMS V8.3 on an Alpha, and with PHP v5.3.4 in Apache v2.2.17
> running under Mac OS X v10.6.8.  The JPEG file is served by a Webcam.  The
> documentation (on php.net) for "http://" says the stream opened by fopen only
> provides access to the body of the response.  Why is it, then, that when I
> call on fpassthru for the (JPEG URL) stream, I see the headers included in the
> data returned?
> 
> 	The code looks basically like this:
> 
>  $image = fopen ( "http://...jpg", "r" );
>  foreach ( $http_response_header as $header )
>  {
>    echo "{$header}\r\n";
>  }
>  echo "\r\n";
>  fpassthru ( $image );
>  fclose ( $image );
> 
> With the above, the headers are clearly visible at the beginning of the data,
> rendering a lot of meaningless code in the browser window, rather than an
> actual image.  One work-around I've developed is...
> 
>  $image = fopen ( "http://...jpg", "r" );
>  $inHeaders = 1;
>  while ( $inHeaders && ! feof ( $image ) )
>  {
>    $line = fgets ( $image );
>    echo $line;
>    $inHeaders = ( $line != "\r\n" );
>  }
>  if ( ! feof ( $image ) )
>    fpassthru ( $image );
>  fclose ( $image );
> 
> Can anyone explain why I'm seeing behavior counter to the documentation with
> "fopen ( 'http://...' )" and "fpassthru (...)"?  (FWIW, the purpose of the
> code is to "proxy" a Webcam image that isn't directly available, so that as
> far as the browser is concerned, the image is served by the web server
> hosting this PHP code.)
> 
> Thanks,
> Mike

I can't confirm the problem - no headers here:

strobel@s114-intel:~> php -a
Interactive shell

php > $h = fopen('http://php.net','r');
php > fpassthru ($h);
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
 <title>PHP: Hypertext Preprocessor</title>
...

Tested on an ubuntu 10.04 server.

/Str.

Thread

Headers in fpassthru() output DAVISM@ecr6.ohio-state.edu (Michael T. Davis) - 2012-02-07 02:40 +0000
  Re: Headers in fpassthru() output "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-02-07 09:48 +0100
  Re: Headers in fpassthru() output "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-02-07 09:56 +0100
  Re: Headers in fpassthru() output "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2012-02-07 10:34 +0100
    Re: Headers in fpassthru() output DAVISM@ecr6.ohio-state.edu (Michael T. Davis) - 2012-02-07 16:36 +0000
      Re: Headers in fpassthru() output "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-02-07 17:50 +0100
        Re: Headers in fpassthru() output DAVISM@ecr6.ohio-state.edu (Michael T. Davis) - 2012-02-07 17:35 +0000
          Re: Headers in fpassthru() output "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-02-08 11:38 +0100
      Re: Headers in fpassthru() output "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2012-02-08 10:10 +0100

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