cURL 経由で HTTP POST 要求を送信し、応答として json 文字列を期待する単純な PHP スクリプトを用意しました (これには pecl_http/HTTPRequest のような既存のライブラリを使用したかったのですが、できませんでした)。呼び出しは一貫して 415 エラー - サポートされていないメディア タイプで失敗します。cURL を正しく構成していないと思いますが、何度も検索しても、何が間違っているのかわかりません。ここにいくつかのコードがあります:
class URLRequest
{
    public $url;
    public $headers;
    public $params;
    public $body;
    public $expectedFormat;
    public $method;
    public function URLRequest($aUrl, array $aHeaders, array $aParams, $aFormat = "json", $isPost = false, $aBody = "+")
    {
        $this->url = $aUrl;
        $this->headers = $aHeaders;
        $this->params = $aParams;
        $this->expectedFormat = $aFormat;
        $this->method = ($isPost ? "POST" : "GET");
        $this->body = $aBody;
    }
    public function exec()
    {
        $queryStr = "?";
        foreach($this->params as $key=>$val)
            $queryStr .= $key . "=" . $val . "&";
        //trim the last '&'
        $queryStr = rtrim($queryStr, "&");
        $url = $this->url . $queryStr;
        $request = curl_init();
        curl_setopt($request, CURLOPT_URL, $url);
        curl_setopt($request, CURLOPT_HEADER, 1);
        curl_setopt($request, CURLOPT_HTTPHEADER, $this->headers);
        curl_setopt($request, CURLOPT_RETURNTRANSFER, 1);
        //curl_setopt($request, CURLOPT_SSL_VERIFYPEER, false);
        if($this->method == "POST")
        {
            curl_setopt($request, CURLOPT_POST, 1);
            curl_setopt($request, CURLOPT_POSTFIELDS, $this->body);
            //this prevents an additions code 100 from getting returned
            //found it in some forum - seems kind of hacky
            curl_setopt($request, CURLOPT_HTTPHEADER, array("Expect:"));
        }
        $response = curl_exec($request);
        curl_close($request);
        preg_match("%(?<=HTTP/[0-9]\.[0-9] )[0-9]+%", $response, $code);
        $resp = "";
        if($this->expectedFormat == "json")
        {
            //parse response
        }
        elseif($this->expectedFormat == "xml")
        {
            //parse response
        }
        return $resp;
    }
}
$url = "http://mydomain.com/myrestcall";
$query = array( "arg_1" =>      "test001",
                "arg_2" =>      "test002",
                "arg_3" =>      "test003");
$headers = array(    "Accept-Encoding" =>    "gzip",
                    "Content-Type" =>       "application/json",
                    "Accept" =>             "application/json",
                    "custom_header_1" =>    "test011",
                    "custom_header_2" =>    "test012",
                    "custom_header_3" =>    "test013");
$body = array(  "body_arg_1" =>      "test021",
                "body_arg_2" =>     array("test022", "test023"), 
                "body_arg_3" =>     "test024"); 
$request = new URLRequest($url, $headers, $query, "json", true, $body);
$response = $request->exec();
...そして応答:
HTTP/1.1 415 Unsupported Media Type
Server: Apache-Coyote/1.1
X-Powered-By: Servlet 2.5; JBoss-5.0/JBossWeb-2.1
Content-Type: text/html;charset=utf-8
Content-Length: 1047
Date: Mon, 18 Jun 2012 16:30:44 GMT
<html><head><title>JBoss Web/2.1.3.GA - Error report</title></head><body><h1>HTTP Status 415 - </h1><p><b>type</b> Status report</p><p><b>message</b> <u></u></p><p><b>description</b> <u>The server refused this request because the request entity is in a format not supported by the requested resource for the requested method ().</u></p><h3>JBoss Web/2.1.3.GA</h3></body></html>
洞察やアイデアはありますか?
前もって感謝します!