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Re: Headers in fpassthru() output [message #176938 is a reply to message #176934]

Tue, 07 February 2012 09:34

alvaro.NOSPAMTHANX
Messages: 277
Registered: September 2010

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Senior Member

El 07/02/2012 3:40, Michael T. Davis escribió/wrote:
> 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.

I don't know for sure what manual page you are quoting (you just point
to the PHP site) but the full quote at the page for the HTTP wrapper [1] is:

«The stream allows access to the body of the resource; the headers are
stored in the $http_response_header variable.»

.... and that's exactly what you are doing: printing the values of the
$http_response_header variable [2].

[1] http://es2.php.net/manual/en/wrappers.http.php
[2] http://es2.php.net/manual/en/reserved.variables.httpresponseheader.php

> 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 (...)"?

Neither http://es.php.net/manual/en/function.fopen.php nor
http://es.php.net/fpassthru claim that $http_response_header should not
get populated...

--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
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[Message index]

		Headers in fpassthru() output By: DAVISM on Tue, 07 February 2012 02:40
		Re: Headers in fpassthru() output By: M. Strobel on Tue, 07 February 2012 08:48
		Re: Headers in fpassthru() output By: M. Strobel on Tue, 07 February 2012 08:56
		Re: Headers in fpassthru() output By: alvaro.NOSPAMTHANX on Tue, 07 February 2012 09:34
		Re: Headers in fpassthru() output By: DAVISM on Tue, 07 February 2012 16:36
		Re: Headers in fpassthru() output By: M. Strobel on Tue, 07 February 2012 16:50
		Re: Headers in fpassthru() output By: DAVISM on Tue, 07 February 2012 17:35
		Re: Headers in fpassthru() output By: M. Strobel on Wed, 08 February 2012 10:38
		Re: Headers in fpassthru() output By: alvaro.NOSPAMTHANX on Wed, 08 February 2012 09:10

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