HTTP context options

    HTTP context options — HTTP context option listing

    Description

    Context options for http:// and https:// transports.

    Options

    method string

    GET, POST, or any other HTTP method supported by the remote server.

    Defaults to GET.

    header array or string

    Additional headers to be sent during request. Values in this option will override other values (such as User-agent:, Host:, and Authentication:), even when following Location: redirects. Thus it is not recommended to set a Host: header, if follow_location is enabled.

    user_agent string

    Value to send with User-Agent: header. This value will only be used if user-agent is not specified in the header context option above.

    By default the user_agent php.ini setting is used.

    content string

    Additional data to be sent after the headers. Typically used with POST or PUT requests.

    proxy string

    URI specifying address of proxy server (e.g. tcp://proxy.example.com:5100).

    request_fulluri bool

    When set to true, the entire URI will be used when constructing the request (e.g. GET http://www.example.com/path/to/file.html HTTP/1.0). While this is a non-standard request format, some proxy servers require it.

    Defaults to false.

    follow_location int

    Follow Location header redirects. Set to 0 to disable.

    Defaults to 1.

    max_redirects int

    The max number of redirects to follow. Value 1 or less means that no redirects are followed.

    Defaults to 20.

    protocol_version float

    HTTP protocol version.

    Defaults to 1.1 as of PHP 8.0.0; prior to that version the default was 1.0.

    timeout float

    Read timeout in seconds, specified by a float (e.g. 10.5).

    By default the default_socket_timeout php.ini setting is used.

    ignore_errors bool

    Fetch the content even on failure status codes.

    Defaults to false.

    Examples

    Example #1 Fetch a page and send POST data

    <?php

    $postdata     = http_build_query(
    array(
    'var1' => 'some content',
    'var2' => 'doh'
    )
    );

    $opts = array('http' =>
    array(
    'method' => 'POST',
    'header' => 'Content-type: application/x-www-form-urlencoded',
    'content' => $postdata
    )
    );

    $context = stream_context_create($opts);

    $result = file_get_contents('http://example.com/submit.php', false, $context);

    ?>

    Example #2 Ignore redirects but fetch headers and content

    <?php

    $url     = "http://www.example.org/header.php";

    $opts = array('http' =>
    array(
    'method' => 'GET',
    'max_redirects' => '0',
    'ignore_errors' => '1'
    )
    );

    $context = stream_context_create($opts);
    $stream = fopen($url, 'r', false, $context);

    // header information as well as meta data
    // about the stream
    var_dump(stream_get_meta_data($stream));

    // actual data at $url
    var_dump(stream_get_contents($stream));
    fclose($stream);
    ?>

    Notes

    Note: Underlying socket stream context options
    Additional context options may be supported by the underlying transport For http:// streams, refer to context options for the tcp:// transport. For https:// streams, refer to context options for the ssl:// transport.

    Note: HTTP status line
    When this stream wrapper follows a redirect, the wrapper_data returned by stream_get_meta_data() might not necessarily contain the HTTP status line that actually applies to the content data at index 0. 

    array (
  'wrapper_data' =>
  array (
    0 => 'HTTP/1.0 301 Moved Permanently',
    1 => 'Cache-Control: no-cache',
    2 => 'Connection: close',
    3 => 'Location: http://example.com/foo.jpg',
    4 => 'HTTP/1.1 200 OK',
    ...
    The first request returned a 301 (permanent redirect), so the stream wrapper automatically followed the redirect to get a 200 response (index = 4).

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    User Contributed Notes 11 notes

    up
    30
    nate
    10 years ago
    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',
    ],
    ],
    ]));
    ?>
    up
    16
    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(...))));
    up
    19
    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(...))));
    up
    5
    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)
    up
    14
    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.
    up
    4
    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).
    up
    5
    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);
    up
    9
    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
    up
    5
    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.
    )
    );

    . . .

    ?>
    up
    3
    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 );
    ?>
    up
    0
    njt1982 at yahoo dot com
    4 months ago
    It's worth noting that the `header` array seems to only want an array of strings, not an associative array.

    I just spent a chunk of time debugging something not working as expected (no errors though) which was fixed by converting an associative array of headers into a simple array of strings.
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