我正在将我的应用程序迁移到 AWS EC2 实例,它曾经托管在 Hostgator 中并且工作正常,现在我已经成功迁移它,但我遇到了一些 CORS 错误问题。
我的应用程序是前端的 Angular 6 应用程序,我使用 nginx 部署了它。后端托管在 heroku 中,它是 NodeJs 8.0 Restful API
经过许多小时的研究,我发现我必须更改应用程序的服务文件。
一开始是这样的,除了CORS错误之外,运行良好
server {
listen 80;
listen [::]:80;
server_name http://your-site-name.com;
root /var/www/app-name;
server_tokens off;
index index.html index.htm;
location / {
# First attempt to server request as file, then
# as directory, then fall back to displaying a 404.
try_files $uri $uri/ /index.html =404;
}
}
然后我尝试了我找到的解决方案
location / {
if ($request_method = 'OPTIONS') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content-Type' 'text/plain; charset=utf-8';
add_header 'Content-Length' 0;
return 204;
}
if ($request_method = 'POST') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
}
if ($request_method = 'GET') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
}
}
这不起作用,在重新加载我的页面后,我收到了 404 未找到 nginx 错误。下一个解决方案做了同样的事情:
location / {
# Simple requests
if ($request_method ~* "(GET|POST)") {
add_header "Access-Control-Allow-Origin" *;
}
# Preflighted requests
if ($request_method = OPTIONS ) {
add_header "Access-Control-Allow-Origin" *;
add_header "Access-Control-Allow-Methods" "GET, POST, OPTIONS, HEAD";
add_header "Access-Control-Allow-Headers" "Authorization, Origin, X-Requested-With, Content-Type, Accept";
return 200;
}
....
# Handle request
....
}
最后我尝试了这个:
location / {
dav_methods PUT DELETE MKCOL COPY MOVE;
# Preflighted requestis
if ($request_method = OPTIONS) {
add_header "Access-Control-Allow-Origin" *;
add_header "Access-Control-Allow-Methods" "GET, POST, OPTIONS, HEAD, DELETE";
add_header "Access-Control-Allow-Headers" "Authorization, Origin, X-Requested-With, Content-Type, Accept";
return 200;
}
# CORS WHITELIST EVERYTHING
# This is allowing everything because I am running
# locally so there should be no security issues.
if ($request_method = (GET|POST|OPTIONS|HEAD|DELETE)) {
add_header "Access-Control-Allow-Origin" *;
add_header "Access-Control-Allow-Headers" "Authorization, Origin, X-Requested-With, Content-Type, Accept";
}
try_files $uri $uri/ /index.html$is_args$args;
}
最后一个解决方案工作正常(意味着我的应用程序正在加载并且没有出现 404 错误),但它仍然给了我 CORS 错误
是的,我确实在后端启用了 CORS,这是我的 server.js 文件:
require('./config/config.js');
//Requires
const express = require('express')
const colors = require('colors')
const bodyParser = require('body-parser')
const app = express();
//Enable cors
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With,
Content-Type, Accept, token");
res.header("Access-Control-Allow-Methods", "POST, GET, PUT, DELETE, OPTIONS");
next();
});
// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(require("./routes/index"));
//serve
app.listen(process.env.PORT, () => {
console.log(`Listening ${process.env.PORT}. Status:`, 'online'.green)
});
这是我在浏览器控制台中遇到的错误
Access to XMLHttpRequest at
'https://backend.herokuapp.com/inventory/most_sold' from origin
'http://front-end-ip' has been blocked by CORS policy: No 'Access-Control-
Allow-Origin' header is present on the requested resource.
希望你们能给我一些指导
提前致谢
最佳答案
您可以使用 CORS(一个 Node.js 包,用于提供 Connect/Express 中间件,可用于通过各种选项启用 CORS),即,
- 通过
npm i cors
在node.js中安装CORS
在 server.js 文件中:-
const cors = require("cors");
然后设置 CORS 选项,
const corsoption = { 起源:真实, 方法:“获取、头部、放置、补丁、发布、删除”, 凭证:真实, 暴露 header :[“x-auth-token”] };
app.use(cors(corsoption));
那么您将不会被 CORS 政策阻止。
文档:- cors package
关于node.js - 使用 nginx 和 aws 启用 cors 的正确配置是什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56963725/