&更新；内部WP HTTP API是my answer to this question, 也可以作为一个插件could 工作

注意：代码没有经过测试-我不知道您的服务器设置等-只是我脑子里写出来的。您必须对其进行测试，找到合并参数的正确位置，并设置URL等。

如果自定义远程存储库发回可用的头（这种情况并不常见），那么初始测试（#1）可以得到改进。所以如果是这样，你最好使用wp_remote_head() 相反，它使HTTP请求更加轻量级。

<?php
defined( \'ABSPATH\' ) OR exit;
/**
 * Plugin Name: (#78267) Custom Theme Update Args
 * Description: Adds custom arguments to the HTTP request for a theme or plugin update from a custom location.
 * Version:     2013-04-02.2139
 * Author:      Franz Josef Kaiser <[email protected]>
 * Author URI:  http://unserkaiser.com
 * License:     The MIT License (MIT)
 * LicenseURI:  http://www.opensource.org/licenses/mit-license.php
 */

add_filter( \'http_request_args\', \'custom_upgrade_process\', 9, 2 );
/**
 * Callback for a HTTP request used to switch the
 * SSL verification in case of a WP error response
 * and routing to a custom Theme or Plugin repository.
 * @param  array  $r   Request arguments
 * @param  string $url Request URL
 * @return array  $r
 */
function custom_upgrade_process( $r, $url )
{
    // Alter the following settings according to your
    // update procedure and admin pages that deliver it.
    # A) The admin URL
    $custom_repo = \'https://example.com?foo=bar\';

    if (
        0 !== strpos( $url, \'http://api.wordpress.org/plugins/update-check\' )
        XOR 0 !== strpos( $url, \'http://api.wordpress.org/themes/update-check\' )
    )
        return $r;

    # 1) Do an initial test to check if things are working as expected
    $response = wp_remote_get(
        $custom_repo,
        array(
            \'timeout\'     => 120,
            \'httpversion\' => \'1.1\',
        )
    );
    # 2) Turn off SSL verification in case the HTTP request didn\'t work out
    if (
        is_wp_error( $response )
        AND strstr( $response->get_error_message(), \'SSL: certificate subject name\' )
    )
        add_filter( \'https_ssl_verify\', \'__return_false\' );

    # 3) Add your custom request arguments
    $r = array_merge( $r, array(
        \'login\' => get_option( \'login\' ),
        \'pass\'  => get_option( \'pass\' ),
    ) );

    return $r;
}

祝你好运。：）