nginx 504 Gateway Time-out
场景：前端 vue 请求后端超时
原因：后端 dao 层执行 sql 查询速度慢，导致 nginx 无法在默认的时间内（60s）从后端获取 response
解决：在 http > server > location 下面添加 proxy_read_timeout 属性，延长时间，单位为秒，如设为 5min
location /api/ { | |
proxy_pass http://localhost:8080/; | |
proxy_read_timeout 300; # 设置为 5 分钟 | |
} |
proxy_read_timeout time
Link：http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout
Syntax: proxy_read_timeout time;
Default: proxy_read_timeout 60s;
Context: http, server, location
Defines a timeout for reading a response from the proxied server.
The timeout is set only between two successive read operations,
not for the transmission of the whole response. If the proxied server
does not transmit anything within this time, the connection is closed.
参考：
https://blog.csdn.net/ruijiao_ren/article/details/79499228
http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout
https://stackoverflow.com/questions/24453388/nginx-reverse-proxy-causing-504-gateway-timeout
附录：
windows 启动 nginx：start nginx.exe
windows 关闭 nginx：nginx.exe -s quit
proxy_connect_timeout
Link: http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_connect_timeout
Syntax: proxy_connect_timeout time;
Default: proxy_connect_timeout 60s;
Context: http, server, location
Defines a timeout for establishing a connection with a proxied server.
It should be noted that this timeout cannot usually exceed 75 seconds.
proxy_send_timeout
Link: http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_send_timeout
Syntax: proxy_send_timeout time;
Default: proxy_send_timeout 60s;
Context: http, server, location
Sets a timeout for transmitting a request to the proxied server.
The timeout is set only between two successive write operations,
not for the transmission of the whole request. If the proxied server
does not receive anything within this time, the connection is closed.
