如何为Rocket.rs设置CORS或OPTIONS

问题描述

我有一个正在运行的robot.rs后端，我的Flutter Web应用程序将其发送至该请求，但它无法通过OPTIONS响应.

I've got a backend running rocket.rs which my flutter web app sends a request to, but it can't get past the OPTIONS response.

我尝试将CORS(rocket_cors)添加到后端并具有选项响应，但它仍会发回:

I have tried adding CORS (rocket_cors) to the backend and having a options response, but it still sends back:

Error: XMLHttpRequest error.
    dart:sdk_internal 124039:30                           get current
packages/http/src/browser_client.dart.lib.js 214:124  <fn>

我在火箭项目中添加了以下内容:

I have added the following to my rocket project:

#[options("/")]
fn send_options<'a>(path: PathBuf) -> Response<'a> {
    let mut res = Response::new();
    res.set_status(Status::new(200, "No Content"));
    res.adjoin_header(ContentType::Plain);
    res.adjoin_raw_header("Access-Control-Allow-Methods", "POST, GET, OPTIONS");
    res.adjoin_raw_header("Access-Control-Allow-Origin", "*");
    res.adjoin_raw_header("Access-Control-Allow-Credentials", "true");
    res.adjoin_raw_header("Access-Control-Allow-Headers", "Content-Type");
    res

我的flutter应用正在运行此请求:

And my flutter app is running this request:

Future<String> fetchData() async {
  final data2 = await http.get("http://my-web-site.com").then((response) { // doesn't get past here
    return response.body; 
  });
  return data2;
}

问题:这是响应OPTION请求的正确方法吗?如果没有，如何在rocket.rs中实现它?

Question: Is this the proper way to respond to OPTION requests, and if not, how can I implement it in rocket.rs?

推荐答案

Lambda Fairy的评论为我解答了.
我将其全部放入GET处理程序:

Lambda Fairy's comment answered it for me.
I put it all in the GET Handler:

#[get("/")]
fn get_handler<'a>() -> Response<'a> {
    let mut res = Response::new();
    res.set_status(Status::new(200, "No Content"));
    res.adjoin_header(ContentType::Plain);
    res.adjoin_raw_header("Access-Control-Allow-Methods", "POST, GET, OPTIONS");
    res.adjoin_raw_header("Access-Control-Allow-Origin", "*");
    res.adjoin_raw_header("Access-Control-Allow-Credentials", "true");
    res.adjoin_raw_header("Access-Control-Allow-Headers", "Content-Type");
    res.set_sized_body(Cursor::new("Response")); 
    res

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