如何在Nginx代理服务器中启用CORS？

Question

作为我的标题,这是位于conf.d/api-server.conf中的配置文件

server {
  listen 80;
  server_name api.localhost;

  location / {
    add_header 'Access-Control-Allow-Origin' 'http://api.localhost';
    add_header 'Access-Control-Allow_Credentials' 'true';
    add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
    add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE,PATCH';

    if ($request_method = 'OPTIONS') {
      add_header 'Access-Control-Max-Age' 1728000;
      add_header 'Content-Type' 'text/plain charset=UTF-8';
      add_header 'Content-Length' 0;
      return 204;
    }

    proxy_redirect off;
    proxy_set_header host $host;
    proxy_set_header X-real-ip $remote_addr;
    proxy_set_header X-forward-for $proxy_add_x_forwarded_for;
    proxy_pass http://127.0.0.1:3000;
  }
}

nginx.conf文件与默认文件保持一致.

在我向api.localhost(api.localhost/admin/login)发送请求后,我仍然收到405错误:

XMLHttpRequest cannot load http://api.localhost/admin/login. Response 
to preflight request doesn't pass access control check: No 'Access-
Control-Allow-Origin' header is present on the requested resource. 
Origin 'http://admin.localhost:3000' is therefore not allowed access. 
The response had HTTP status code 405.

Answer 1

问题是你的if条件不会在父节点中发送标题/.如果您检查预检响应标题,它将是

HTTP/1.1 204 No Content
Server: nginx/1.13.3
Date: Fri, 01 Sep 2017 05:24:04 GMT
Connection: keep-alive
Access-Control-Max-Age: 1728000
Content-Type: text/plain charset=UTF-8
Content-Length: 0

这没有任何帮助.所以有两种可能的修复方法.复制add_header内部if块也

server {
  listen 80;
  server_name api.localhost;

  location / {
    add_header 'Access-Control-Allow-Origin' 'http://api.localhost';
    add_header 'Access-Control-Allow-Credentials' 'true';
    add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
    add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE,PATCH';

    if ($request_method = 'OPTIONS') {
      add_header 'Access-Control-Allow-Origin' 'http://api.localhost';
      add_header 'Access-Control-Allow-Credentials' 'true';
      add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
      add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE,PATCH';
      add_header 'Access-Control-Max-Age' 1728000;
      add_header 'Content-Type' 'text/plain charset=UTF-8';
      add_header 'Content-Length' 0;
      return 204;
    }

    proxy_redirect off;
    proxy_set_header host $host;
    proxy_set_header X-real-ip $remote_addr;
    proxy_set_header X-forward-for $proxy_add_x_forwarded_for;
    proxy_pass http://127.0.0.1:3000;
  }
}

或者您可以将其移动到位置块之外,因此每个请求都有响应

server {
   listen 80;
   server_name api.localhost;

 add_header 'Access-Control-Allow-Origin' 'http://api.localhost';
 add_header 'Access-Control-Allow-Credentials' 'true';
 add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
 add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE,PATCH';

  location / {

    if ($request_method = 'OPTIONS') {
      add_header 'Access-Control-Max-Age' 1728000;
      add_header 'Content-Type' 'text/plain charset=UTF-8';
      add_header 'Content-Length' 0;
      return 204;
    }

    proxy_redirect off;
    proxy_set_header host $host;
    proxy_set_header X-real-ip $remote_addr;
    proxy_set_header X-forward-for $proxy_add_x_forwarded_for;
    proxy_pass http://127.0.0.1:3000;
  }
}

如果您只想允许配置中的某些位置用于CORS.就像/api那时你应该用你的标题创建一个模板conf

 add_header 'Access-Control-Allow-Origin' 'http://api.localhost';
 add_header 'Access-Control-Allow-Credentials' 'true';
 add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
 add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE,PATCH';

然后使用

include conf.d/corsheaders.conf;

在你的OPTIONS块和/api块中.所以CORS只允许使用/api.如果您不关心CORS的位置,那么您可以使用第二种方法将核心标头移动到服务器块