我正在尝试向客户提供维护页面,以便在维护时向我的应用程序发出请求.以下是我的Nginx配置.
server {
recursive_error_pages on;
listen 80;
...
if (-f $document_root/maintenance.html) {
return 503;
}
error_page 404 /404.html;
error_page 500 502 504 /500.html;
error_page 503 @503;
location = /404.html {
root $document_root;
}
location = /500.html {
root $document_root;
}
location @503 {
error_page 405 =/maintenance.html;
if (-f $request_filename) {
break;
}
rewrite ^(.*)$/maintenance.html break;
}
}
假设我已经通过创建$document_root / maintenance.html来启用我的网站维护.当用户使用带有text / html的Accept标头发出请求时,会正确地提供此文件.
$curl http://server.com/ -i -v -X GET -H "Accept: text/html" * Adding handle: conn: 0xf89420 * Adding handle: send: 0 * Adding handle: recv: 0 * Curl_addHandleToPipeline: length: 1 * - Conn 0 (0xf89420) send_pipe: 1,recv_pipe: 0 * About to connect() to server.com port 80 (#0) * Trying xxx.xxx.xxx.xxx... * Connected to server.com (xxx.xxx.xxx.xxx) port 80 (#0) > GET / HTTP/1.1 > User-Agent: curl/7.33.0 > Host: server.com > Accept: text/html > < HTTP/1.1 503 Service Temporarily Unavailable HTTP/1.1 503 Service Temporarily Unavailable * Server Nginx/1.1.19 is not blacklisted < Server: Nginx/1.1.19 Server: Nginx/1.1.19 < Date: Thu,14 Nov 2013 11:16:16 GMT Date: Thu,14 Nov 2013 11:16:16 GMT < Content-Type: text/html Content-Type: text/html < Content-Length: 27 Content-Length: 27 < Connection: keep-alive Connection: keep-alive < This is under maintenance. * Connection #0 to host server.com left intact
现在一些客户端将Accept标头设置为application / json.如何向他们发送JSON响应而不是maintenance.html？
以下是将Accept设置为application / json时得到的响应.
$curl http://server.com/ -i -v -X GET -H "Accept: application/json" * Adding handle: conn: 0x190c430 * Adding handle: send: 0 * Adding handle: recv: 0 * Curl_addHandleToPipeline: length: 1 * - Conn 0 (0x190c430) send_pipe: 1,recv_pipe: 0 * About to connect() to server.com port 80 (#0) * Trying xxx.xxx.xxx.xxx... * Connected to server.com (xxx.xxx.xxx.xxx) port 80 (#0) > GET / HTTP/1.1 > User-Agent: curl/7.33.0 > Host: server.com > Accept: application/json > < HTTP/1.1 503 Service Temporarily Unavailable HTTP/1.1 503 Service Temporarily Unavailable * Server Nginx/1.1.19 is not blacklisted < Server: Nginx/1.1.19 Server: Nginx/1.1.19 < Date: Thu,14 Nov 2013 11:15:50 GMT Date: Thu,14 Nov 2013 11:15:50 GMT < Content-Type: text/html Content-Type: text/html < Content-Length: 27 Content-Length: 27 < Connection: keep-alive Connection: keep-alive < This is under maintenance. * Connection #0 to host server.com left intact
解决方法
尝试使用地图
map $http_accept $maintenance_page {
default /maintenance.html;
~application/json /maintenance.json;
}
然后用$maintenance_page替换/maintenance.html
关于http://nginx.org/en/docs/http/ngx_http_map_module.html的更多细节
