使用 DELETE 获取 api 问题 - 即使 cors 良好,也会更改 OPTIONS

Fetch api issue with DELETE - changes to OPTIONS even when cors is good

在客户端浏览器中使用 fetch api,GET 或 POST 没有问题,但 fetch 和 DELETE 有问题。它似乎将 DELETE 请求方法更改为 OPTIONS。

大多数研究表明是一个 cors 问题,但我已经涵盖了 cors 问题。

我不确定这是否是 valid fetch spec api link 但它显示:

A CORS-safe listed method is a method that is GET, HEAD, or POST.

我不确定这是否意味着我无法使用 DELETE 对 cors 进行提取,这就是我遇到问题的原因?

浏览器代码:

var request =
          new Request(url, {
            credentials: 'include',
            mode: 'cors',
            method: 'DELETE'
          });

        return fetch(request)
          .then(this.fetchError.bind(this))
          .then(this.json)
          .then((response)=> {
            this.set(`uploadState.${index}.value`, false);
          })
          .catch((e) => {
            console.log(e);
          });
      },

chrome 网络选项卡:

Request URL:http://72.12.4.3:9000/api/v1/listings/3/47/image-3-47-1492565415145.jpeg
Request Method:OPTIONS
Status Code:401 Unauthorized
Remote Address:72.12.4.3:9000

Response Headers
view source
Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:true
Access-Control-Allow-Methods:POST, GET, OPTIONS, DELETE
Access-Control-Allow-Origin:http://72.12.4.3:8000
Connection:keep-alive
Content-Length:25
Content-Type:application/json; charset=utf-8
Date:Wed, 19 Apr 2017 01:36:07 GMT
ETag:W/"19-9NCRiMyz+z1Bt6fGQfcxA"
X-Powered-By:Express

Request Headers
view source
Accept:*/*
Accept-Encoding:gzip, deflate, sdch
Accept-Language:en-US,en;q=0.8
Access-Control-Request-Headers:
Access-Control-Request-Method:DELETE
Cache-Control:no-cache
Connection:keep-alive
Host:72.12.4.3:9000
If-None-Match:W/"19-9NCRiMyz+z1Bt6fGQfcxA"
Origin:http://72.12.4.3:8000
Pragma:no-cache
Referer:http://72.12.4.3:8000/
User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

OPTIONS 请求是预期的,基本上是浏览器用来检查请求 DELETE 在这种情况下是否被允许的机制。

OPTIONS 请求似乎从您的服务器得到 401 Unauthorized 响应。这确实会导致请求失败。改为回复 200 OK

顺便说一句,header Access-Control-Allow-Headers: 是错误的,但这应该不会影响任何事情。