javascript - CI 和 Angular4 : Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response

Question

我已将所有这些加载到我的后端 (CI) 上，并将其放置在构造上:

    header("Access-Control-Allow-Origin: *");
    header('Access-Control-Allow-Methods: POST, GET, PUT, DELETE, OPTIONS');

    $method = $_SERVER['REQUEST_METHOD'];
    if($method == "OPTIONS") {
        die();
    }

但我仍然有这个错误:

Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response.

这个问题是来自后端(CI)还是我的前端(Angular4)？

Answer 1

您需要在后端的响应中添加 Access-Control-Allow-Headers header ，就像您对请求所做的那样