发布跨域 AJAX

Question

我试图向外部网站发送 POST 请求，到目前为止，由于同源策略，从 iv 读取的内容来看，这是不可能的。但我也读到代理可以绕过这一点。

如果我无法访问外部网站，这是否可能？我似乎无法澄清这一点。

我只想发送一个AJAX POST并获得响应，就像我使用Chrome的高级REST客户端一样。

Answer 1

使用

Access-Control-Allow-Origin: http://foo.example

Answer 2

对问题中的任何其他菜鸟

稍微修改了一下：https://github.com/eslachance/php-transparent-proxy

现在接受发布网址：

<?php
if(!function_exists('apache_request_headers')) {
// Function is from: http://www.electrictoolbox.com/php-get-headers-sent-from-browser/
    function apache_request_headers() {
        $headers = array();
        foreach($_SERVER as $key => $value) {
            if(substr($key, 0, 5) == 'HTTP_') {
                $headers[str_replace(' ', '-', ucwords(str_replace('_', ' ', strtolower(substr($key, 5)))))] = $value;
            }
        }
        return $headers;
    }
}
// Figure out requester's IP to shipt it to X-Forwarded-For
$ip = '';
if (!empty($_SERVER['HTTP_CLIENT_IP'])) { 
    $ip = $_SERVER['HTTP_CLIENT_IP'];
    //echo "HTTP_CLIENT_IP: ".$ip;
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    //echo "HTTP_X_FORWARDED_FOR: ".$ip;
} else {
    $ip = $_SERVER['REMOTE_ADDR'];
    //echo "REMOTE_ADDR: ".$ip;
}
//
preg_match('@^(?:http://)?([^/]+)@i', $_SERVER['HTTP_REFERER'], $matches);
$host = $matches[1];
preg_match('/[^.]+.[^.]+$/', $host, $matches);
$domainName = "{$matches[0]}";
//
//writelog($_POST);
$method = $_SERVER['REQUEST_METHOD'];
$desturl;
    // parse the given URL
    if($method == "POST") {
        $desturl = $_POST['url'];
        unset($_POST['url']);
    }
    else if ($method == "GET") {
        $desturl = $_GET['url'];
        unset($_GET['url']);
    }

$response = proxy_request($desturl, ($method == "GET" ? $_GET : $_POST), $method);
$headerArray = explode("rn", $response[header]);
foreach($headerArray as $headerLine) {
    header($headerLine);
}
echo $response[content];

function proxy_request($url, $data, $method) {
// Based on post_request from http://www.jonasjohn.de/snippets/php/post-request.htm
    global $ip;
    // Convert the data array into URL Parameters like a=b&foo=bar etc.

    //$data = http_build_query($data);
    $data = json_encode($data, JSON_FORCE_OBJECT);
    writelog($data);
    $datalength = strlen($data);


    $url = parse_url($url);
    //echo $url;
    if ($url['scheme'] != 'http') { 
        die('Error: Only HTTP request are supported !');
    }
    // extract host and path:
    $host = $url['host'];
    $path = $url['path'];
    // open a socket connection on port 80 - timeout: 30 sec
    $fp = fsockopen($host, 80, $errno, $errstr, 30);
    if ($fp){
        $out="";
        if($method == "POST") {
            $out ="POST $path HTTP/1.1rn";
        } else {
            $out ="GET $path?$data HTTP/1.1rn";
        }
        //Todo Get headers and forward them...
        $requestHeaders = apache_request_headers();
        while ((list($header, $value) = each($requestHeaders))) {
            /*if($header !== "Connection" && $header !== "Host" && $header !== "Content-Length" 
                && $header !== "Content-Type"
                && $header !== "Origin"
                && $header !== "Referer"
                && $header !== "X-Requested-With"
                && $header !== "Accept-Encoding"
                ) {
               // $out.= "$header: $valuern";
                writelog("$header: $valuern");
            }*/
            if($header == "Cookie" && $header == "User-Agent" ) {
                 $out.= "$header: $valuern";
                //writelog("$header: $valuern");
            }
        }
        $out.= "Host: $hostrn";
        $out.= "Content-Type: application/json; charset=UTF-8rn";
        $out.= "Content-Length: $datalengthrn";
        $out.= "Connection: Closernrn";
        $out.= $data;
        fwrite($fp, $out);

        $result = ''; 
        while(!feof($fp)) {
            // receive the results of the request
            $result .= fgets($fp, 128);
        }
    }
    else { 
        return array(
            'status' => 'err', 
            'error' => "$errstr ($errno)"
        );
    }
    // close the socket connection:
    fclose($fp);
    // split the result header from the content
    $result = explode("rnrn", $result, 2);
    $header = isset($result[0]) ? $result[0] : '';
    $content = isset($result[1]) ? $result[1] : '';

    // return as structured array:
    return array(
        'status' => 'ok',
        'header' => $header,
        'content' => $content
    );
}
?>