Nginx解決前端調用後端接口跨域問題

 一、項目中遇到的問題描述：

前端調用zuul統一網關服務接口，請求狀態碼200，可是無返回數據。

瀏覽器控制檯報錯信息：No  Access-Control-Allow-Origin header is present on requested resource . 

 二、解決問題

借鑑https://blog.csdn.net/envon123/article/details/83270277博客。

項目配置以下： 

location /xxxx-server { #/xxxx-server不能以/結尾
add_header 'Access-Control-Allow-Origin' $http_origin;
add_header 'Access-Control-Allow-Credentials' 'true';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,web-token,app-token,Authorization,Accept,Origin,Keep-Alive,User-Agent,X-Mx-ReqToken,X-Data-Type,X-Auth-Token,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
if ($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;
}
#springcloud的zuul組件對外統一網關，xxxx-server是springcloud的後臺服務組件
proxy_pass http://127.0.0.1/xxxx-server; #/xxxx-server不能以/結尾
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}