"Connection timed out" for /figure/z_scale/ with many images

[joshmoore]

Seen today on ns-web:

Analyze this line2022/09/14 13:24:10 [error] 18612#18612: *14441825 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 134.36.66.29, server: ome-ns-web, request: "GET /figure/z_scale/?image=4475383&image=4475385&image=4475399&image=4479988&image=4479990&image=4479981&image=4479978&image=4479971&image=4479975&image=4479984&image=4481451&image=4481452&image=4481453&image=4481454&image=4481457&image=4481456&image=4481455&image=4481458&image=4481459&image=4481460&image=4481162&image=4481158&image=4481154&image=4481444&image=4481440&image=4481441&image=4481443&image=4481442&image=4481445&image=4481446&image=4481448&image=4481447&image=4481449&image=4481450&image=4482239&image=4482061&image=4482238&image=4482241&image=4482240&image=4482060&image=4482245&image=4482242&image=4482244&image=4482057&image=4482243&image=4482246&image=4482248&image=4482249&image=4482247&image=4482250&image=4482252&image=4482253&image=4486233&image=4486234&image=4486235&image=4486236&image=4486237&image=4486239&image=4486240&image=4486238&image=4486241&image=4486242&image=4486245&image=4486244&image=4486243&image=4487449&image=4487450&image=4487452&image=4487451&image=4487454&image=4487455&image=4487457&image=4487460&image=4487459&image=4487456&image=4487458&image=4487462&image=4487464&image=4487465&image=4487463&image=4487467&image=4487466&image=4487468&image=4487461&image=4487453&image=4489629&image=4489628&image=4489627&image=4489626&image=4489625&image=4491100&image=4491099&image=4491098&image=4491097&image=4491096&image=4491095&image=4491094&image=4491093&image=4514533&image=4514532&image=4514530&image=4514531&image=4514529&image=4514534&image=4514536&image=4514535&_=1663158178120 HTTP/1.0", upstream: "http://127.0.0.1:4080/figure/z_scale/?image=4475383&image=4475385&image=4475399&image=4479988&image=4479990&image=4479981&image=4479978&image=4479971&image=4479975&image=4479984&image=4481451&image=4481452&image=4481453&image=4481454&image=4481457&image=4481456&image=4481455&image=4481458&image=4481459&image