Question

我为/api/test建立了一个可靠的角色：

Allow-Origin: http://localhost:8133
Allow-Headers: X-MyHeader
Allow-Method: Get

即

services.AddCors(options =>
{
    options.AddPolicy("default", policy =>
    {
        policy.WithOrigins("http://localhost:8133")
            .WithHeaders("X-MyHeader")
            .WithMethods("GET");
    });
});

和

app.UseCors("default");

如果我使用axios向/api/test发送带有标头X-MyHeader的获取请求，则会发送OPTIONS请求，例如

Access-Control-Request-Headers: x-myheader
Access-Control-Request-Method: GET
Host: localhost:8132
Origin: http://localhost:8133

我收到了回复

Access-Control-Allow-Headers: x-myheader
Access-Control-Allow-Origin: http://localhost:8133
Date: {whatever}
server: {whatever}

为什么缺少Access-Control-Allow-Method标头？

现在，如果我添加另一个标题，例如X-NotSupportedHeader，例如

Access-Control-Request-Headers: x-notsupportedheader
Access-Control-Request-Method: GET
Host: localhost:8132
Origin: http://localhost:8133

我的回答是

Date: {whatever}
server: {whatever}

在控制台中我们得到了

XMLHttpRequest cannot load http://localhost:8132/api/test. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8133' is therefore not allowed access.

如果任何条件失败，为什么没有设置Access-Control-Allow-*标头？

Answer 1

没关系，只需阅读规范。

https://www.w3.org/TR/cors/#resource-preflight-requests

CORS预检响应不正确/空标题

1 个答案: