[BUG] Adding more than 213 feeds causes nginx issue - "502 Bad Gateway"

LinuxServer FreshRSS Docker イメージで、213 個を超えるフィードを追加して購読管理ページを開くことで障害を再現します。まず nginx プロキシの動作とコンテナログを確認します。少なくとも 214 個のフィードがあってもページにアクセスできる状態が維持されれば完了です。理想的には、報告された数千フィード規模でも確認します。

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

If I add more than 213 feeds it breaks the Subscription Management page (?c=subscription). Trying to visit the subscription management pages results in "502 Bad Gateway". If I delete the 214th feed, the Subscription Management page starts working again.

Google AI suggests that it's an issue with nginx proxying and suggesting making changes to the size of several proxy buffer settings.

I opened an issue with FreshRSS and one of their maintainers said that their official Docker does not use nginx and they suspect that the issue is related to nginx proxying.

Expected Behavior

FreshRSS should be able to handle thousands of feeds without issue

Steps To Reproduce

1. I am using this Docker from the official image in the Unraid package manager / store
2. I have been using it without issue for several months. When I added the 214th feed the Subscription Management page stopped working and reports "502 Bad Gateway". If I delete the 214th feed the page starts working again.

I have tried many combinations of adding/removing feeds to different categories and the 214th feed triggers the issue no matter where or how I add it.

Environment

- OS: Unraid 7.2.4
- The Docker image was installed from the Unraid official package manager/store

CPU architecture

x86-64

Docker creation

docker run
  -d
  --name='freshrss'
  --net='bridge'
  --pids-limit 2048
  -e TZ="America/New_York"
  -e HOST_OS="Unraid"
  -e HOST_HOSTNAME="Voyager"
  -e HOST_CONTAINERNAME="freshrss"
  -e 'PUID'='99'
  -e 'PGID'='100'
  -e 'UMASK'='022'
  -l net.unraid.docker.managed=dockerman
  -l net.unraid.docker.webui='http://[IP]:[PORT:80]'
  -l net.unraid.docker.icon='https://raw.githubusercontent.com/linuxserver/docker-templates/master/linuxserver.io/img/freshrss-logo.png'
  -p '8180:80/tcp'
  -v '/mnt/disks/ssd1/appdata/freshrss':'/config':'rw,slave' 'lscr.io/linuxserver/freshrss'
c03578b1280f687ad490693e2cebe437d067d479a39eb5d83d314a3ed026804c

Container logs

[migrations] started
[migrations] 01-nginx-site-confs-default: skipped
[migrations] 02-default-location: skipped
[migrations] done
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      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

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Linuxserver.io version: 1.28.1-ls302
Build-date: 2026-04-19T13:50:37+00:00
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using keys found in /config/keys
[custom-init] No custom files found, skipping...
[ls.io-init] done.