TAL Education Technology

Aug 17, 2023 · Operations

Deep Dive into Nginx request_time and upstream_response_time: Causes and Solutions

This article explains the meanings of Nginx’s request_time and upstream_response_time logs, investigates why request_time can be significantly larger, analyzes packet captures and source code to reveal the impact of lingering_timeout and connection closing behavior, and provides configuration guidance to eliminate the 5‑second delay.