nginx处理跨域

因为浏览器的同源策略，导致在a站点拿不到b站点的资源，然而前后端分离开发，前端开起的服务和后端起的服务IP地址不同，导致拿不到资源,这时就需要做代理解决跨域问题

nginx的默认配置是这样：

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # 这句指最终配置加载conf.d下面的所有配置文件
    include /etc/nginx/conf.d/*.conf;

    # 这里是配置代理的地方
    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  _;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location / {
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

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

}

如要配置需要代理的地址http://192.168.11.20:8082/api/getdata，可如下配置：

server {
        listen       80;
        server_name  localhost;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location /api/ {
          proxy_pass http://192.168.11.20:8082/;
        }

    }

若本身后端服务配置的接口地址已经是api，则需要改成其他的名字：

server {
        listen       80;
        server_name  localhost;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location /api/ {
          proxy_pass http://10.33.29.63:8802/;
        }
        location /otherApi/ {
          proxy_pass http://192.168.11.20:8082/api/;
        }

    }