Nginx 中使用 map 解决多来源跨域问题

map 中需注意，如果存在多个配置文件，不能使用相同的变量名，故这里示例为 $allow_origin_A

1# 在 server 上方添加 map
2map $http_origin $allow_origin_A {
3    default "";
4    "~^(https?://localhost(:[\d]+)?)" $1;
5    "~^(https?://127.0.0.1(:[\d]+)?)" $1; 
6    "~^(https?://192.168.[\d]+.[\d]+(:[\d]+)?)" $1;
7    "~^(https?://front.example.com(:[\d]+)?)" $1;
8}
9
10server {
11    listen       80;
12    server_name  api.example.com;
13
14    charset utf-8;
15    root    /var/www/wwwroot/api.example.com;
16
17    add_header Access-Control-Allow-Origin $allow_origin_A;
18    add_header Access-Control-Allow-Credentials true;
19    add_header Access-Control-Expose-Headers 'HeaderA, HeaderB'; # 允许响应的头
20
21    location / {
22            # 用于强制跳转 HTTPS
23            #if ($scheme = http) {
24            #    return 301 https://$host$request_uri;
25            #}
26
27            if ($request_method = 'OPTIONS') {
28                add_header Access-Control-Allow-Origin $allow_origin_A;
29                add_header Access-Control-Allow-Credentials true;
30                add_header Access-Control-Allow-Headers 'Accept, Authorization, Content-Type'; # 允许请求的头
31
32                add_header Content-Length 0;
33                return 204;
34            }
35        }
36    }
37
38    location ~ /\.ht {
39        deny  all;
40    }
41}