ktor cors 标头中的 Access-Control-Allow-Origin 问题

Question

我正在使用 ktor 和使用 cors 构建一个简单的 REST API，但是当我发送一个没有标头数据的简单 get 请求时，服务器工作正常，但是如果我希望客户端说 key:1，服务器没有正确响应我，它说问题是

Failed to load http://127.0.0.1:8080/test: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. The response had HTTP status code 403.

所以这是我的 ktor 代码

install(ContentNegotiation) {
        gson {
        }
    }
    install(ForwardedHeaderSupport)
    install(DefaultHeaders)
    install(CORS)
    {
        method(HttpMethod.Options)
        method(HttpMethod.Get)
        method(HttpMethod.Post)
        method(HttpMethod.Put)
        method(HttpMethod.Delete)
        method(HttpMethod.Patch)
        header(HttpHeaders.AccessControlAllowHeaders)
        header(HttpHeaders.ContentType)
        header(HttpHeaders.AccessControlAllowOrigin)
        allowCredentials = true
        anyHost()
        maxAge = Duration.ofDays(1)
    }
...
 get("test"){
            val a =  call.request.headers["key"]
            println(a)
            call.respond(Product(name = a))
        }

我的 javascript 代码看起来像这样....

fetch('http://shop-ix.uz:8080/test', {
 headers: {
 "key": "1" 
})
   .then(response => response.json())
   .then(json => {    
     console.log(json);
   })

请帮我

Answer 1

You need to whitelist your headers like this:

install(CORS) {
  header("key")
}

This needs to be done with every custom HTTP header you intend to use.