Bug #51330 [Opn->Wfx]: file_get_contents for url hangs
Edit report at http://bugs.php.net/bug.php?id=51330&edit=1
ID: 51330
Updated by: aharvey@php.net
Reported by: liren dot chen at gmail dot com
Summary: file_get_contents for url hangs
-Status: Open
+Status: Wont fix
Type: Bug
Package: HTTP related
Operating System: win and linux
PHP Version: 5.2.13
New Comment:
This looks like a problem with the Al-Jazeera Web serving infrastructure
rather
than a PHP issue. Basically, it's responding to a HTTP 1.0 request with
no
Connection header with a HTTP 1.1 response with a "Connection:
keep-alive"
header, which is counter to section 8.1.2.1 of RFC 2616, which states:
"Clients and servers SHOULD NOT assume that a persistent connection is
maintained for HTTP versions less than 1.1 unless it is explicitly
signaled. See
section 19.6.2 for more information on backward compatibility with
HTTP/1.0
clients."
It's a SHOULD NOT, not a MUST NOT, but nevertheless it doesn't line up
with
normal HTTP server behaviour out there on the 'net, and there's no
support for
handling keep-alive connections within the HTTP wrapper. The problem can
be
worked around from within PHP by sending an explicit Connection request
header
like so:
<?php
$options = array(
'http' => array(
'header' => 'Connection: close'
)
);
$ctx = stream_context_create($options);
$content = file_get_contents('http://english.aljazeera.net/', false,
$ctx);
?>
Since php_stream_url_wrap_http_ex() downloads the entire response from
the
connection (and blocks until the socket is closed) before parsing the
HTTP
response (including headers), it would require a considerable amount of
work to
refactor the code to allow the Content-Length header to be examined.
This _might_ be something we could look at post-5.3, but I think this is
best
closed for now.
Previous Comments:
------------------------------------------------------------------------
[2010-03-19 10:35:37] liren dot chen at gmail dot com
Description:
------------
file_get_contents("http://english.aljazeera.net/")
hangs until timeout.
I did a debug and found that file_get_contents doesn't check the
"content-length" header.
If you do this way:
file_get_contents("http://english.aljazeera.net/", NULL, NULL, 0,
1);
then get "content-length" from the response header,
then
file_get_contents("http://english.aljazeera.net/", NULL, NULL, 0,
the-value-from-content-length);
then it works.
Apparently we should close the socket when we read content-length bytes
from the socket and return.
Test script:
---------------
file_get_contents("http://english.aljazeera.net/")
------------------------------------------------------------------------
--
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