javascript – hapi.js Cors Pre-flight不返回Access-Control-Allow-Origin标头

我使用(Dropzone js)上传了ajax文件.它将文件发送到我的hapi服务器.我意识到浏览器发送了一个PREFLIGHT OPTIONS METHOD.但我的hapi服务器似乎没有发送正确的响应标题,所以我在chrome上遇到错误.
这是我得到的错误

XMLHttpRequest cannot load http://localhost:3000/uploadbookimg. 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:4200' is therefore not allowed access.

这是hapi js路由处理程序

server.route({
        path: '/uploadbookimg',method: 'POST',config: {
            cors : true,payload: {
                output: 'stream',parse: true,allow: 'multipart/form-data'
            },handler: require('./books/webbookimgupload'),}
    });

在我的理解中,hapi js应该从Pre-fight(OPTIONS)请求发送所有cors头.
不明白为什么不是

来自Chrome的网络请求/响应

**General**
Request Method:OPTIONS
Status Code:200 OK
Remote Address:127.0.0.1:3000

**Response Headers**
view parsed
HTTP/1.1 200 OK
content-type: application/json; charset=utf-8
cache-control: no-cache
vary: accept-encoding
Date: Wed,27 Apr 2016 07:25:33 GMT
Connection: keep-alive
Transfer-Encoding: chunked

**Request Headers**
view parsed
OPTIONS /uploadbookimg HTTP/1.1
Host: localhost:3000
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
Access-Control-Request-Method: POST
Origin: http://localhost:4200
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/50.0.2661.87 Safari/537.36
Access-Control-Request-Headers: accept,cache-control,content-type
Accept: */*
Referer: http://localhost:4200/books/upload
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

提前致谢

解决方法

hapi cors：true是一个通配符规则,它允许来自所有域的CORS请求,除了少数情况,包括在 hapi’s default whitelist之外还有其他请求标头时：

[“接受”,“授权”,“内容类型”,“if-none-match”,“origin”]

See the cors option section in the API docs under route options：

headers – a strings array of allowed headers (‘Access-Control-Allow-Headers’). Defaults to ['Accept','Authorization','Content-Type','If-None-Match'].

additionalHeaders – a strings array of additional headers to headers. Use this to keep the default headers in place.

您的问题是Dropzone发送了几个标题以及不在此列表中的文件上载：

> x-requested-with(不在上面的标题中,但是是为我发送的)
>缓存控制

您有两种方法可以使工作正常,您需要在服务器或客户端上进行更改：

选项1 – 将额外标题列入白名单：

server.route({
    config: {
        cors: {
            origin: ['*'],additionalHeaders: ['cache-control','x-requested-with']
        }
    },path: '/upload',handler: function (request,reply) {

        ...
    }
});

选项2 – 告诉dropzone不发送那些额外的标题

尚未通过他们的配置,但有一个待定的PR允许它：https://github.com/enyo/dropzone/pull/685