本地环境后端服务nginx反向代理，前端联调CORS设置不生效解决

异地办公，网络不通，前端在后端不发布测试环境的情况下，连接后端开发者本地服务。

1 步骤

1.1 后端本地启动服务

例如我这里有12个微服务都在本地启动，每个服务各自占一个端口。

1.2 内网穿透工具

本人用的huashengke，那个需要实名和付钱，9.9可以映射2个端口，有公网服务器的话可以自己部署开源FRP。我把80穿出去了

1.3 windows下载绿色版的nginx，修改conf然后启动

1.3.1 主要解决下跨域问题

有时CORS Error的原因不是没设置Access-Control-Allow-Origin，也不是因为 Access-Control-Allow-Origin的通配符*不起作用，而是Access-Control-Allow-Headers设置错了，如果写的是枚举值，可能漏掉某些不常用header，比如requestid，所以设置成$http_access_control_request_headers always
在option方法中设置Access-Control-Allow-Origin，在外面就不要设置，不然前端请求返回是Access-Control-Allow-Origin: *,*

1.3.2 conf

复制代码

worker_processes  1;

events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;

    server {
        listen       80;
        server_name  127.0.0.1;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
        }
	
		
		# 服务course: 8110
		location /course/api {
			add_header X-Debug-Location "course-api-block" always;
			
			# 预检请求处理
			if ($request_method = 'OPTIONS') {
				add_header Access-Control-Allow-Origin "*" always;
				add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
				add_header Access-Control-Allow-Credentials true always;
				add_header Access-Control-Allow-Headers $http_access_control_request_headers always;
				return 200;
			}

			add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
			add_header Access-Control-Allow-Headers $http_access_control_request_headers always;
			add_header Access-Control-Allow-Credentials true always;
			
			proxy_pass http://127.0.0.1:8110/api;
			proxy_set_header Host $host;
			proxy_set_header X-Real-IP $remote_addr;
			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

			# WebSocket 支持（如果需要）
			proxy_http_version 1.1;
			proxy_set_header Upgrade $http_upgrade;
			proxy_set_header Connection "upgrade";
		}
		
		# 服务system: 8100
		location /system/api {			
			add_header X-Debug-Location "system-api-block" always;
			
			# 预检请求处理
			if ($request_method = 'OPTIONS') {
				add_header Access-Control-Allow-Origin "*" always;
				add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
				add_header Access-Control-Allow-Credentials true always;
				add_header Access-Control-Allow-Headers $http_access_control_request_headers always;
				return 200;
			}

			add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
			add_header Access-Control-Allow-Headers $http_access_control_request_headers always;
			add_header Access-Control-Allow-Credentials true always;
			
			proxy_pass http://127.0.0.1:8100/api;
		}
	
		# 省略 10个服务配置

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

1.4 启动nginx

powershell直接定位到nginx目录，直接运行即可

1.5 前端配置

前端调用就调用到axios，访问地址如下配置

JavaScript 复制代码

COURSE: 'http://xxx.vicp.fun/course/api',
SYSTEM: 'http://xxx.vicp.fun/system/api',
// skip over