Occasional "400 Bad Request" Responses from Nginx

[Hiroaki Nakamura]

Hello,

During my experimentation with Nginx's rate limit features, I
encountered an issue where Nginx occasionally sends "400 Bad Request"
responses for requests that appear to be correct.
With further investigation, I discovered that this issue also occurs
even when not utilizing the rate limit features.

I have provided a reproduction of this issue on GitHub:
https://github.com/hnakamur/ats-nginx-bad-request/tree/enable_debug_log

Additionally, I have included log files and tcpdump outputs within the
repository for further analysis.

Your assistance in investigating this matter would be greatly appreciated.

Thank you.

-- 
中村 弘輝 )Hioraki Nakamura) hnakamur at gmail.com