vue has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource

引用和引用[2]提供了关于如何解决CORS跨域问题的方法。在Django项目中，您可以使用django-cors-headers来处理CORS跨域请求。首先，您需要在项目的settings.py文件中添加corsheaders中间件和应用。然后，您可以通过配置CORS_ORIGIN_WHITELIST来设置允许跨域请求的白名单。最后，确保将CORS_ALLOW_CREDENTIALS设置为False，以防止携带cookie的跨域请求。这样，您就可以解决"vue has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource"的问题了。

相关问题

vue blocked by CORS policy: No Access-Control-Allow-Origin header is present on the requested resource.

跨域资源共享（CORS）是一种机制，它使用额外的HTTP头来告诉浏览器让运行在一个origin（域）上的Web应用被准许访问来自不同源服务器上的指定的资源。如果一个资源的访问没有得到允许，那么就会出现“blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.”的错误提示。解决这个问题的方法有以下几种：

1.在服务端设置Access-Control-Allow-Origin头部信息，允许跨域访问。例如，在Node.js中，可以使用cors模块来设置：

const express = require('express');
const cors = require('cors');
const app = express();
app.use(cors());

2.使用代理服务器，将请求转发到目标服务器。例如，在vue.config.js中配置代理：

module.exports = {
  devServer: {
    proxy: {
      '/api': {
        target: 'http://localhost:3000',
        changeOrigin: true,
        pathRewrite: {
          '^/api': ''
        }
      }
    }
  }
}

3.在前端使用JSONP或者WebSocket等技术进行跨域请求。

Vue has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

The error message you are seeing indicates a Cross-Origin Resource Sharing (CORS) issue. CORS is a browser security feature that prohibits web pages from making requests to a different domain than the one that served the page.

To resolve this issue, you have a few options:

1. Configure the server: You need to add the appropriate response headers to your server's responses to allow cross-origin requests. Specifically, you need to include the "Access-Control-Allow-Origin" header with the value of the requesting domain.

2. Use a proxy server: If you don't have control over the server's configuration, you can set up a proxy server that forwards requests from your domain to the target server. By doing this, the same-origin policy will be satisfied, and CORS won't be an issue.

3. Use a JSONP request: If the server supports JSONP (JSON with Padding), you can use it as an alternative. JSONP is a technique that allows making cross-origin requests by dynamically adding a ```<script>``` tag to the page.

Choose the appropriate solution based on your specific situation and server setup.