Main NC proxy is not configured to support the 1800s request timeout

[pmarini-nc]

(Forked from nextcloud/context_chat_backend#214.)

Given this prompt (the instance has all the sample standard docs in it, so the prompt should return something):

# occ context_chat:stats
ContextChat statistics:
Installed time: 2025-09-14 21:13 UTC
Index complete time: 2025-09-15 09:24 UTC
Total time taken for complete index: 0 days 12:11 (hh:mm)
Total eligible files: 39
Files in indexing queue: 0
Queued documents (without files):array (
)
Files successfully sent to backend: 35
Indexed documents: array (
  'files__default' => 35,
)
Actions in queue: 0
File system events in queue: 0

# occ context_chat:prompt admin-e4zt "Nextcloud"
Error received from Context Chat Backend (ExApp) with status code 504: unknown error

# docker logs nc_app_context_chat_backend
decode: cannot decode batches with this context (calling encode() instead)
init: embeddings required but some input tokens were not marked as outputs -> overriding
llama_perf_context_print:        load time =     116.39 ms
llama_perf_context_print: prompt eval time =    3302.21 ms /     4 tokens (  825.55 ms per token,     1.21 tokens per second)
llama_perf_context_print:        eval time =       0.00 ms /     1 runs   (    0.00 ms per token,      inf tokens per second)
llama_perf_context_print:       total time =    3302.42 ms /     5 tokens
INFO:     127.0.0.1:54948 - "POST /v1/embeddings HTTP/1.1" 200 OK

[pmarini-nc]

Nextcloud.log

{
  "reqId": "hEV0XwYgHxfQNmW4tEMf",
  "level": 3,
  "time": "2025-09-15T11:05:53+00:00",
  "remoteAddr": "",
  "user": "--",
  "app": "no app in context",
  "method": "",
  "url": "--",
  "message": "Unknown error while processing TaskProcessing task",
  "userAgent": "--",
  "version": "32.0.0.10",
  "exception": {
    "Exception": "RuntimeException",
    "Message": "Error received from Context Chat Backend (ExApp) with status code 504: unknown error",
    "Code": 0,
    "Trace": [
      {
        "file": "/var/www/nextcloud/apps/context_chat/lib/Service/LangRopeService.php",
        "line": 334,
        "function": "requestToExApp",
        "class": "OCA\\ContextChat\\Service\\LangRopeService",
        "type": "->"
      },
      {
        "file": "/var/www/nextcloud/apps/context_chat/lib/TaskProcessing/ContextChatProvider.php",
        "line": 121,
        "function": "query",
        "class": "OCA\\ContextChat\\Service\\LangRopeService",
        "type": "->"
      },
      {
        "file": "/var/www/nextcloud/lib/private/TaskProcessing/Manager.php",
        "line": 1012,
        "function": "process",
        "class": "OCA\\ContextChat\\TaskProcessing\\ContextChatProvider",
        "type": "->"
      },
      {
        "file": "/var/www/nextcloud/lib/private/TaskProcessing/SynchronousBackgroundJob.php",
        "line": 54,
        "function": "processTask",
        "class": "OC\\TaskProcessing\\Manager",
        "type": "->"
      },
      {
        "file": "/var/www/nextcloud/lib/public/BackgroundJob/Job.php",
        "line": 61,
        "function": "run",
        "class": "OC\\TaskProcessing\\SynchronousBackgroundJob",
        "type": "->"
      },
      {
        "file": "/var/www/nextcloud/lib/public/BackgroundJob/QueuedJob.php",
        "line": 43,
        "function": "start",
        "class": "OCP\\BackgroundJob\\Job",
        "type": "->"
      },
      {
        "file": "/var/www/nextcloud/lib/public/BackgroundJob/QueuedJob.php",
        "line": 29,
        "function": "start",
        "class": "OCP\\BackgroundJob\\QueuedJob",
        "type": "->"
      },
      {
        "file": "/var/www/nextcloud/cron.php",
        "line": 175,
        "function": "execute",
        "class": "OCP\\BackgroundJob\\QueuedJob",
        "type": "->"
      }
    ],
    "File": "/var/www/nextcloud/apps/context_chat/lib/Service/LangRopeService.php",
    "Line": 168,
    "message": "Unknown error while processing TaskProcessing task",
    "exception": {},
    "CustomMessage": "Unknown error while processing TaskProcessing task"
  }
}
{
  "reqId": "hEV0XwYgHxfQNmW4tEMf",
  "level": 2,
  "time": "2025-09-15T11:05:53+00:00",
  "remoteAddr": "",
  "user": "--",
  "app": "no app in context",
  "method": "",
  "url": "--",
  "message": "A TaskProcessing context_chat:context_chat task with id 27 failed with the following message: Error received from Context Chat Backend (ExApp) with status code 504: unknown error",
  "userAgent": "--",
  "version": "32.0.0.10",
  "data": []
}

context_chat.log

docker_logs.zip

[kyteinsky]

thanks for the logs and pointing out the issue!

{"code":"504","response":"{\"response\":\"<html><body><h1>504 Gateway Time-out</h1>\\nThe server didn't respond in time.\\n</body></html>\\n\\n\"}

missed the obvious 504 🤦

so the issue is that the main NC proxy does not use this timeout:

HaRP/Dockerfile

Line 38 in 8db40c0

HP_TIMEOUT_SERVER="1800s" \

but whatever might be the default, maybe 30s so the requests timeout.
We're discussing what would be the best way to fix it but for the time being increasing the main proxy timeout to 1800s should fix it.

transfering this issue to the harp repo for tracking.

[pmarini-nc]

Glad that you found the root cause!

for the time being increasing the main proxy timeout to 1800s should fix it

What do you mean with main proxy? The one that is referred to here)?

[kyteinsky]

yes, the same

[pmarini-nc]

Ok, thanks for the confirmation.

In my case with Nextcloud behind a HA Proxy doing TLS termination, putting

  timeout client 1800s
  timeout server 1800s

in HA Proxy configuration and

ProxyPass /exapps/ http://<harp ip>:8780/exapps/ connectiontimeout=1800 timeout=1800

in local Apache2 virtual host, solves the error. I'll test more in the next few days and let you know.

[oleksandr-nc]

Any news on this? Can we close it? Or should we adjust some docs?