Syntax: proxy_send_timeout time;
Default: proxy_send_timeout 60s;
Context: http, server, location
The timeout is set only between two successive write operations, not for the transmission of the whole request.
Syntax: proxy_read_timeout time;
Default: proxy_read_timeout 60s;
Context: http, server, location
The timeout is set only between two successive read operations, not for the transmission of the whole response.
Editar esses obviamente ajudou o que perguntou.