Note that if you set the protocol_version option to 1.1 and the server you are requesting from is configured to use keep-alive connections, the function (fopen, file_get_contents, etc.) will "be slow" and take a long time to complete. This is a feature of the HTTP 1.1 protocol you are unlikely to use with stream contexts in PHP.
Simply add a "Connection: close" header to the request to eliminate the keep-alive timeout:
<?php
// php 5.4 : array syntax and header option with array value
$data = file_get_contents('http://www.example.com/', null, stream_context_create([
'http' => [
'protocol_version' => 1.1,
'header' => [
'Connection: close',
],
],
]));
?>
Opciones de contexto de HTTP
Opciones de contexto de HTTP — Listado de opciones de contexto de HTTP
Descripción
Opciones de contexto para los transportes http:// y
https://.
Historial de cambios
| Versión | Descripción |
|---|---|
| 5.3.4 |
Se añadió follow_location.
|
| 5.3.0 |
La opción protocol_version admite la decodificación de
transferencias fragmentadas en caso de valer 1.1.
|
| 5.2.10 |
Se añadió ignore_errors.
|
| 5.2.10 |
El parámetro header ahora puede ser un array de índices numéricos.
|
| 5.2.1 |
Se añadió timeout.
|
| 5.1.0 | Se añadió el soporte de HTTPS mediante proxies HTTP. |
| 5.1.0 |
Se añadió max_redirects.
|
| 5.1.0 |
Se añadió protocol_version.
|
Ejemplos
Ejemplo #1 Obtener una página y enviar datos POST
<?php
$datos_post = http_build_query(
array(
'var1' => 'contenido',
'var2' => 'doh'
)
);
$opciones = array('http' =>
array(
'method' => 'POST',
'header' => 'Content-type: application/x-www-form-urlencoded',
'content' => $datos_post
)
);
$contexto = stream_context_create($opciones);
$resultado = file_get_contents('http://example.com/submit.php', false, $contexto);
?>
Ejemplo #2 Ignorar las redirecciones, aunque obtener las cabeceras y el contenido
<?php
$url = "http://www.example.org/header.php";
$opciones = array('http' =>
array(
'method' => 'GET',
'max_redirects' => '0',
'ignore_errors' => '1'
)
);
$contexto = stream_context_create($opciones);
$flujo = fopen($url, 'r', false, $contexto);
// información de cabeceras y meta datos
// sobre el flujo
var_dump(stream_get_meta_data($flujo));
// datos reales en $url
var_dump(stream_get_contents($flujo));
fclose($flujo);
?>Notas
Nota: Opciones de contexto del flujo de socket subyacente
Se pueden admitir opciones de contexto adicionales mediante el transporte subyacente. Para flujoshttp://, deben consultarse las opciones de contexto del transportetcp://. Para flujoshttps://, deben consultarse las opciones de contexto del transportessl://.
Nota: Línea de estado HTTP
Cuando esta envultura de flujo sigue una redirección, los datos enwrapper_datadevueltos por stream_get_meta_data() podrían no contener necesariamente la línea de estado HTTP que realmente se aplica a los datos del contenido del índice0.La primera petición devolvió unarray ( 'wrapper_data' => array ( 0 => 'HTTP/1.0 301 Moved Permantenly', 1 => 'Cache-Control: no-cache', 2 => 'Connection: close', 3 => 'Location: http://example.com/foo.jpg', 4 => 'HTTP/1.1 200 OK', ...301(redirección permanente), de manera que la envoltura del flujo sigue automáticamente la redirección para obtener una respuesta de código200(índice =4).
add a note
User Contributed Notes 10 notes
nate ¶
10 years ago
daniel dot peder at gmail dot com ¶
7 years ago
note that for both http and https protocols require the same 'http' context keyword:
<?php
// CORRECT example:
// this will work as expected
// note the url with https but context with http
$correct_data = file_get_contents('https://example.com', false, stream_context_create(array('http' => array(...))));
// INVALID example:
// this will not work, the context will be ignored
// note the url with https also context with https
$correct_data = file_get_contents('https://example.com', false, stream_context_create(array('https' => array(...))));
daniel.peder (a) gmail.com ¶
7 years ago
note that both http and https transports require the same context name http
// OK example:
// this will work as expected
// note the url with https but context with http
$correct_data = file_get_contents('https://example.com', false, stream_context_create(array('http' => array(...))));
// INVALID example:
// this will not work, the context will be ignored
// note the url with https also context with https
$correct_data = file_get_contents('https://example.com', false, stream_context_create(array('https' => array(...))));
gourav sarkar ¶
13 years ago
watch your case when using methods (POST and GET)...it must be always uppercase. in case of you write it in lower case it wont work.
ASchmidt at Anamera dot net ¶
3 years ago
With the default of
'follow_location' => 1
be certain NEVER include a "Host:" header in the 'header' array.
If the host is set to "mydomain.com", and that web site has a (quite common) redirect to "www.mydomain.com", then the initial request to "http://mydomain.com" will get the expected response of:
HTTP/1.1 301 Moved Permanently
Location: http://www.mydomain.com/
However, the follow-up request does NOT replace the original "host" header with the new "location" value, as one would expect. Consequently each "follow-location" request will again be served by the original host of "http://mydomain.com", and continue the redirect loop until 'max_redirects' has been exhausted.
(For details: https://bugs.php.net/bug.php?id=77889)
ywarnier at beeznest dot org ¶
7 years ago
Note that setting request_fulluri to true will *change* the value of $_SERVER['REQUEST_URI] on the receiving end (from /abc.php to http://domain.com/abc.php).
aruntechguy at outlook dot com ¶
7 years ago
If you want to use Basic Auth while using get_headers(), use stream_context options below.
I am using HEAD method here, but please feel free to use GET also.
<?php
$targetUrl = 'http or https target url here';
$basicAuth = base64_encode('username:password');
stream_context_set_default(
[
'http' => [
'method' => 'HEAD',
'header' => 'Authorization: Basic ' . $basicAuth
]
]
);
$result = get_headers($targetUrl);
print_r($result);
vchampion at gmail dot com ¶
12 years ago
If you use the proxy server and encounter an error "fopen(http://example.com): failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request" note that in many situations you need also set the parameter "request_fulluri" to "true" in your stream options. Without this option the php script sends the empty request to the server as "GET / HTTP/0.0" and the proxy server replies to it with the "HTTP 400" error.
For example (working sample):
<?php
$stream = stream_context_create(Array("http" => Array("method" => "GET",
"timeout" => 20,
"header" => "User-agent: Myagent",
"proxy" => "tcp://my-proxy.localnet:3128",
'request_fulluri' => True /* without this option we get an HTTP error! */
)));
if ( $fp = fopen("http://example.com", 'r', false, $stream) ) {
print "well done";
}
?>
P>S> PHP 5.3.17
jay ¶
9 years ago
Remember to match content with Content-type:
<?php
$data = array(
'var1' => 'some content',
'var2' => 'doh'
);
$opts = array('http' =>
array(
'method' => 'POST',
'header' => 'Content-type: application/json', // here...
'content' => json_encode($data) // and here.
)
);
. . .
?>
chris ¶
10 years ago
I had quite a bit of trouble trying to make a request with fopen through a proxy to a secure url. I kept getting a 400 Bad Request back from the remote host. It was receiving the proxy url as the SNI host. In order to get around this I had to explicity set the SNI host to the domain I was trying to reach. It's apparently the issue outlined in this bug:
https://bugs.php.net/bug.php?id=63519
<?php
$domain = parse_url($file, PHP_URL_HOST);
$proxy_string = "tcp://" . WP_PROXY_HOST . ":" . WP_PROXY_PORT;
$opts = array(
'http' => array( 'proxy' => $proxy_string ),
'ssl' => array( 'SNI_enabled' => true, 'SNI_server_name' => $domain));
$context = stream_context_create($opts);
$handle = fopen( $file, 'r', false, $context );
?>
