解决这个问题很简单，只需要几个步骤，不用担心任何事情。

请遵循以下步骤来解决它。

open (https://www.npmjs.com/package/cors#enabling-cors-pre-flight) go to installation and copy the command npm install cors to install via Node.js in a terminal go to Simple Usage (Enable All CORS Requests) by scrolling. Then copy and paste the complete declaration in your project and run it...that will work for sure... copy the comment code and paste in your app.js or any other project and give a try...this will work. This will unlock every cross origin resource sharing...so we can switch between servers for your use

我正在使用AWS SDK进行上传，在花了一些时间在网上搜索之后，我偶然发现了这个问题。多亏了@lsimoneau 45581857，原来发生了完全相同的事情。

我只是通过附加区域选项将请求URL指向bucket上的区域，它就工作了。

 const s3 = new AWS.S3({
 accessKeyId: config.awsAccessKeyID,
 secretAccessKey: config.awsSecretAccessKey,
 region: 'eu-west-2'  // add region here });

跨源资源共享(Cross-Origin Resource Sharing, CORS)是一种基于http头的机制，它允许服务器指明浏览器应该允许加载资源的任何源(域、方案或端口)，而不是它自己的源

来自跨原产地资源共享(CORS)

简而言之，网络服务器会告诉你(你的浏览器)你应该信任哪些网站。

Scammysite。Bad尝试告诉浏览器向good-api-site.good发送请求 good-api-site。Good告诉浏览器它应该只信任other-good-site.good 你的浏览器说你真的不应该相信诈骗网站。Bad对good-api-site的请求。很好，CORS救了你。

如果你正在创建一个网站，你真的不关心谁与你集成。犁。在ACL中设置*。

但是，如果您正在创建一个站点，并且只允许站点X，甚至站点X、Y和Z，则使用CORS指示客户端浏览器只信任这些站点与您的站点集成。

浏览器当然可以选择忽略这一点。再次强调，CORS保护的是你的客户，而不是你。

CORS允许定义*或一个站点。这可能会限制你，但你可以通过在你的web服务器上添加一些动态配置来解决这个问题——并帮助你变得具体。

这是一个关于如何在Apache中为每个站点配置CORS的示例:

# Save the entire "Origin" header in Apache environment variable "AccessControlAllowOrigin"
# Expand the regex to match your desired "good" sites / sites you trust
SetEnvIfNoCase Origin "^https://(other-good-site\.good|one-more-good.site)$" AccessControlAllowOrigin=$0
# Assuming you server multiple sites, ensure you apply only to this specific site
<If "%{HTTP_HOST} == 'good-api-site.com'">
    # Remove headers to ensure that they are explicitly set
    Header        unset Access-Control-Allow-Origin   env=AccessControlAllowOrigin
    Header        unset Access-Control-Allow-Methods  env=AccessControlAllowOrigin
    Header        unset Access-Control-Allow-Headers  env=AccessControlAllowOrigin
    Header        unset Access-Control-Expose-Headers env=AccessControlAllowOrigin
    # Add headers "always" to ensure that they are explicitly set
    # The value of the "Access-Control-Allow-Origin" header will be the contents saved in the "AccessControlAllowOrigin" environment variable
    Header always set Access-Control-Allow-Origin   %{AccessControlAllowOrigin}e     env=AccessControlAllowOrigin
    # Adapt the below to your use case
    Header always set Access-Control-Allow-Methods  "POST, GET, OPTIONS, PUT"        env=AccessControlAllowOrigin
    Header always set Access-Control-Allow-Headers  "X-Requested-With,Authorization" env=AccessControlAllowOrigin
    Header always set Access-Control-Expose-Headers "X-Requested-With,Authorization" env=AccessControlAllowOrigin
</If>

要修复Node.js应用程序中的跨源请求问题:

npm i cors

然后简单地将下面的代码添加到app.js文件中:

let cors = require('cors')
app.use(cors())

在我的Apache VirtualHost配置文件中，我添加了以下几行:

Header always set Access-Control-Allow-Origin "*"
Header always set Access-Control-Allow-Methods "POST, GET, OPTIONS, DELETE, PUT"
Header always set Access-Control-Max-Age "1000"
Header always set Access-Control-Allow-Headers "x-requested-with, Content-Type, origin, authorization, accept, client-security-token"

RewriteEngine On
RewriteCond %{REQUEST_METHOD} OPTIONS
RewriteRule ^(.*)$ $1 [R=200,L]

禁用Chrome安全。

创建Chrome快捷方式:右键单击→属性→目标。"C:\Program Files (x86)\谷歌\Chrome\Application\ Chrome .exe"——disable-web-security——user-data-dir=" C: /chromedev"