为什么我的POST file_get_contents返回HTTP错误请求？

Here's my code:

$url = 'http://99.99.99.999:12480/rs/AuthorizationSession';
$credentials = 'admin:system';
$base64 = base64_encode($credentials);

// Set header text.
$header =   "Content-type: application/json
" .
            "Accept: application/json
" .
            "RESTAuthorization: " . $base64;

// Set data.
$postdata = http_build_query(
    array(
        "authorization" => $base64
    )
);

// Set options - POST.
$opts = array("http" => 
    array(
        "method" => "POST",
        "header" => $header,
        "content" => $postdata
    )
);

// Create context and execute.
$context = stream_context_create($opts);
$result = file_get_contents($url, false, $context);

I keep getting: file_get_contents(http://99.99.99.999:12480/rs/AuthorizationSession): failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request

Obviously I changed the IP. This works for a GET request but not POST.

I figure I must have something wrong with my header or post data, but I can't figure it out.

Thoughts?

http_build_query() converts an array to a URL-encoded query string like name=john&password=s3cr3t but the Content-Type header you are sending says the POST data is in JSON.

The request either needs to be changed to reflect the correct Content-Type (application/x-www-form-urlencoded, or http_build_query should really be json_encode() to send the data as JSON.

As it stands now, the server is confused that you are telling it you're sending JSON, but instead sending a URL encoded string (so essentially JSON parsing on the remote is failing) and generating a bad request.

If your code works with GET, but POST fails, it sounds like the host located at 99.99.99.999:12480 on the target server may not be configured to accept POST requests.