设置：
Angular / Django / Nginx in ECS.
Route 53 -> ELB -> Target group ECS
With Nginx proxying /api | /admin calls to Django.
我们的某些 API 请求存在较大的滞后或延迟，日志显示如下：（为方便阅读，已换行）
timestamp="16/Jul/2019:16:24:43 +0000"
client=10.96.192.168
request="GET /api/redacted/?
redacted=0&
redacted=52.895649&
redacted=53.226591&
redacted=-2.900391&
redacted=-1.873169 HTTP/1.1"
request_length=919
bytes_sent=200514
body_bytes_sent=200245
referer=https://redacted.redacted.redacted.redacted.redacted/redacted
user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36"
upstream_addr=127.0.0.1:8000
upstream_status=200
request_time=19.077
upstream_response_time=19.064
upstream_connect_time=0.000
upstream_header_time=19.064
app_db_read_time=-
app_db_write_time=-
app_analysis_time=-
app_other_time=-
引起我们注意的主要延迟是upstream_header_time大约upstream_response_time20 秒！
然而，由于我是 Nginx 新手，我不知道从哪里开始调试它，在本地工作时一切都按预期进行，没有这样的延迟。
问题：什么原因造成这个长达20秒的上游标头/响应时间？
配置文件：https://gist.github.com/jackdh/4fdffe6b11799f544d7cb211cc66bfe2
谢谢
答案1
根据 NGINX 文档：
$upstream_header_timekeeps time spent on receiving the response header from the upstream server (1.7.10); the time is kept in seconds with millisecond resolution. Times of several responses are separated by commas and colons like addresses in the $upstream_addr variable.
所以你的 Python 后端需要很长时间才能回答。