nginx+php,502 Error

The 502 error is basically the PHP process to hang up, one of the reasons may be caused by the process execution timeout settings such as this:

; The timeout for serving a single request after which the worker process would
; Be killed. This option should is used when the ' max_execution_time ' ini option
; Does not a stop script execution for some reason. A value of ' 0 ' means ' off '.
; Available units:s (econds) (default), M (inutes), H (ours), or D (ays)
; Default value:0
; request_terminate_timeout = 0

nginx+php,502 Error