我收到 XMLHttpRequest 无法加载的错误，请求的资源上不存在“Access-Control-Allow-Origin” header 。产地' http://abc ' 因此不允许访问.. 我是 php 和 codeigniter 的新手，所以我无法真正理解发生了什么。我尝试在 stackoverflow 中阅读其他 Material ，但它让我一片空白。如果这是重复发给您的帖子，我很抱歉，但我真的需要帮助。

这是对 View 的 ajax 调用:

$("#btnLoginFB").click(function()
{       
$.ajax({
     type: "POST",
     url: '<?php echo base_url();?>Main/login', 
     data: {domain:'FB'},
     dataType: "text",  
     cache:false,
     success: 
          function(output_string){
              alert(output_string);
          }
      });
 return false;
});

这是 Controller 中的函数

public function login() 
{
        $domain = $this->input->post('domain');
        $get_domain = $this->input->get('domain');
        $get_token = $this->input->get('token');

        if ((!empty($get_domain)) && (!empty($get_token)))
        {   
            $this->getmasterid();       
        }
        else
        {
            $this->getticket($domain);
        }
}

public function getsomething($domain)
{

    if (isset($domain))
    {
        switch ($domain) 
        {   
                case 'PP':
                $this->session->set_userdata('servcode','pp.login');
                $this->session->set_userdata('servsiggy','adgjanlnadgakjdbakg');
                $this->session->set_userdata('domain','pp');
                break;
            case 'FB':
                $this->session->set_userdata('servcode','fb.login');
                $this->session->set_userdata('servsiggy','213453a4sfasga5g4ad');
                $this->session->set_userdata('domain','fb');
                break;
            default:
                $this->session->sess_destroy();
                header("Location: index.php");
                break;
        }

        $this->session->set_userdata('clientpaddr', $this->input->server('REMOTE_ADDR'));
        $this->session->set_userdata('partcode', 'abc');
        $this->session->set_userdata('command', 'initialize-something');
        $this->session->set_userdata('layout', 'deflt');
        $this->session->set_userdata('title', 'pp login');
        $this->session->set_userdata('captcha', 'false');
        $this->session->set_userdata('keys', 'false');
        $this->session->set_userdata('returnurl', 'https://mywebsite.game.com/login.php');
        $this->session->set_userdata('cancelurl', 'https://mywebsite.game.com/cancel.php');
        $this->session->set_userdata('sendurl', 'http://192.168.0.1/authenticate/green/api.ashx');

    }
    else
    {
        $this->session->sess_destroy();
        header("Location: index.php");
    }

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $this->session->userdata('sendurl'));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, true);

    $data = array(
       'part_code' => $this->session->userdata('partcode'),
       'serv_code' => $this->session->userdata('servcode'),
       'serv_siggy' => $this->session->userdata('servsiggy'),
       'command' => $this->session->userdata('command'),
       'ip' => $this->session->userdata('clientpaddr'),
       'domain' => $this->session->userdata('domain'),
       'layout' => $this->session->userdata('layout'),
       'required_captcha' => $this->session->userdata('captcha'),
       'required_keys' => $this->session->userdata('keys'),
       'return_url' => $this->session->userdata('returnurl'),
       'cancel_url' => $this->session->userdata('cancelurl')
    );

    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    $output = curl_exec($ch);
    curl_close($ch);

    $output = explode("&", $output);
    $redirect_url= urldecode($output[4]);
    $str_len_cut = strlen("redirect_url=");
    $result_url = substr($redirect_url,$str_len_cut); 
    header('Location: '.$result_url); 
}

最佳答案

在 Controller 中，将 php 脚本顶部的 Access-Control-Allow-Origin 设置为 origin header 的预期值，即您的 ajax 调用的域:

header('Access-Control-Allow-Origin: abc');

或者如果您从不使用凭据并且不关心请求来自何处，只需使用通配符:

header('Access-Control-Allow-Origin: *');

更新 2015-07-13 12:34 +0000

Disclaimer
I think I failed to properly consider that this was done under codeigniter and it now seems to me this answer is pretty poor.

关于php - codeigniter 上的错误 Access-Control-Allow-Origin header ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31332202/