400 Bad Request error

[TheBest-Name]

Which version of Nextcloud are you using?

32.0.6

Which version of PHP context_chat are you using?

5.3.1

Which version of backend context_chat are you using?

5.3.0

Nextcloud deployment method?

apache non-docker

Describe the Bug

I am getting this error and I don't know if it is hurting indexing.
[WARNING|multipart]: Found invalid character 32 in header at 36346
INFO: - "PUT /loadSources HTTP/1.1" 400 Bad Request

To Reproduce

I used php -f cron.php "OCA\ContextChat\BackgroundJobs\IndexerJob" "OCA\ContextChat\BackgroundJobs\ActionJob" "OCA\ContextChat\BackgroundJobs\SubmitContentJob" "OCA\ContextChat\BackgroundJobs\StorageCrawlJob" "OCA\ContextChat\BackgroundJobs\InitialContentImportJob"

PHP logs (Warning these might contain sensitive information)

{"reqId":"dlMJdUIG3ZxUKz1JpLhX","level":3,"time":"2026-03-03T18:26:46+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"[SubmitContentJob] Error in SubmitContentJob : Error during request to Context Chat Backend (ExApp): Expected keys "loaded_sources" and "sources_to_retry" in response. Please upgrade the Context Chat Backend app to the latest version.","userAgent":"--","version":"32.0.6.1","occ_command":["/NextCloud/cron.php"],"exception":{"Exception":"RuntimeException","Message":"Error during request to Context Chat Backend (ExApp): Expected keys "loaded_sources" and "sources_to_retry" in response. Please upgrade the Context Chat Backend app to the latest version.","Code":0,"Trace":[{"file":"/NextCloud/apps/context_chat/lib/BackgroundJobs/SubmitContentJob.php","line":100,"function":"indexSources","class":"OCA\ContextChat\Service\LangRopeService","type":"->"},{"file":"/NextCloud/lib/public/BackgroundJob/Job.php","line":61,"function":"run","class":"OCA\ContextChat\BackgroundJobs\SubmitContentJob","type":"->"},{"file":"/NextCloud/lib/public/BackgroundJob/QueuedJob.php","line":43,"function":"start","class":"OCP\BackgroundJob\Job","type":"->"},{"file":"/NextCloud/lib/public/BackgroundJob/QueuedJob.php","line":29,"function":"start","class":"OCP\BackgroundJob\QueuedJob","type":"->"},{"file":"/NextCloud/cron.php","line":175,"function":"execute","class":"OCP\BackgroundJob\QueuedJob","type":"->"}],"File":"/NextCloud/apps/context_chat/lib/Service/LangRopeService.php","Line":309,"message":"[SubmitContentJob] Error in SubmitContentJob : Error during request to Context Chat Backend (ExApp): Expected keys "loaded_sources" and "sources_to_retry" in response. Please upgrade the Context Chat Backend app to the latest version.","exception":{},"CustomMessage":"[SubmitContentJob] Error in SubmitContentJob : Error during request to Context Chat Backend (ExApp): Expected keys "loaded_sources" and "sources_to_retry" in response. Please upgrade the Context Chat Backend app to the latest version."}}

Ex-App logs (Warning these might contain sensitive information)

[WARNING|multipart]: Found invalid character 32 in header at 36346
INFO: - "PUT /loadSources HTTP/1.1" 400 Bad Request

Server logs (if applicable)

I don't know if this is applicable but,
[PHP] Warning: fopen(/data/context_chat.log.1): Failed to open stream: No such file or directory at /NextCloud/apps/context_chat/lib/Controller/LogController.php#39
GET /apps/context_chat/download-logs-nextcloud

[kyteinsky]

hello,
this looks like a network error, maybe it's temporary, does it happen often?

Error in SubmitContentJob : Error during request to Context Chat Backend (ExApp)

would you mind posting context_chat PHP logs before this log line?

[TheBest-Name]

I see this:

{"reqId":"Gyjffd5nVDLbwPbMrD4r","level":3,"time":"2026-02-17T13:10:32+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"Background jobs: OCA\\ContextChat\\BackgroundJobs\\ActionJob 118151 ended","userAgent":"--","version":"32.0.6.1","occ_command":["/NextCloud/cron.php"],"data":[]}
{"reqId":"Gyjffd5nVDLbwPbMrD4r","level":3,"time":"2026-02-17T13:10:33+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"Background jobs: OCA\\ContextChat\\BackgroundJobs\\SubmitContentJob 119317 started","userAgent":"--","version":"32.0.6.1","occ_command":["/NextCloud/cron.php"],"data":[]}
{"reqId":"Gyjffd5nVDLbwPbMrD4r","level":3,"time":"2026-02-17T13:10:36+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"Error received from Context Chat Backend (ExApp)","userAgent":"--","version":"32.0.6.1","occ_command":["/NextCloud/cron.php"],"data":{"code":"503","response":"{\"response\":\"<html><body><h1>503 Service Unavailable</h1>\\nNo server is available to handle this request.\\n</body></html>\\n\"}","route":"/loadSources","method":"PUT","retry":""}}
{"reqId":"Gyjffd5nVDLbwPbMrD4r","level":3,"time":"2026-02-17T13:10:36+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"[SubmitContentJob] Error in SubmitContentJob : Error received from Context Chat Backend (ExApp) with status code 503: unknown

and this:

{"reqId":"7ZNejdorU17NPPsGrtYM","level":3,"time":"2026-03-10T01:10:04+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"Background jobs: OCA\\ContextChat\\BackgroundJobs\\SubmitContentJob 123958 started","userAgent":"--","version":"32.0.6.1","occ_command":["/NextCloud/cron.php"],"data":[]}
{"reqId":"7ZNejdorU17NPPsGrtYM","level":3,"time":"2026-03-10T01:10:04+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"Error received from Context Chat Backend (ExApp)","userAgent":"--","version":"32.0.6.1","occ_command":["/NextCloud/cron.php"],"data":{"code":"400","response":"{\"detail\":\"There was an error parsing the body\"}","route":"/loadSources","method":"PUT","retry":""}}
{"reqId":"7ZNejdorU17NPPsGrtYM","level":3,"time":"2026-03-10T01:10:04+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"[SubmitContentJob] Error in SubmitContentJob : Error during request to Context Chat Backend (ExApp): Expected keys \"loaded_sources\" and \"sources_to_retry\" in response. Please upgrade the Context Chat Backend app to the latest version.","userAgent":"--","version":"32.0.6.1","occ_command":["/NextCloud/cron.php"],"exception":{"Exception":"RuntimeException","Message":"Error during request to Context Chat Backend (ExApp): Expected keys \"loaded_sources\" and \"sources_to_retry\" in response. Please upgrade the Context Chat Backend app to the latest version.","Code":0,"Trace":[{"file":"/NextCloud/apps/context_chat/lib/BackgroundJobs/SubmitContentJob.php","line":100,"function":"indexSources","class":"OCA\\ContextChat\\Service\\LangRopeService","type":"->"},{"file":"/NextCloud/lib/public/BackgroundJob/Job.php","line":61,"function":"run","class":"OCA\\ContextChat\\BackgroundJobs\\SubmitContentJob","type":"->"},{"file":"/NextCloud/lib/public/BackgroundJob/QueuedJob.php","line":43,"function":"start","class":"OCP\\BackgroundJob\\Job","type":"->"},{"file":"/NextCloud/lib/public/BackgroundJob/QueuedJob.php","line":29,"function":"start","class":"OCP\\BackgroundJob\\QueuedJob","type":"->"},{"file":"/NextCloud/cron.php","line":175,"function":"execute","class":"OCP\\BackgroundJob\\QueuedJob","type":"->"}],"File":"/NextCloud/apps/context_chat/lib/Service/LangRopeService.php","Line":309,"message":"[SubmitContentJob] Error in SubmitContentJob : Error during request to Context Chat Backend (ExApp): Expected keys \"loaded_sources\" and \"sources_to_retry\" in response. Please upgrade the Context Chat Backend app to the latest version.","exception":{},"CustomMessage":"[SubmitContentJob] Error in SubmitContentJob : Error during request to Context Chat Backend (ExApp): Expected keys \"loaded_sources\" and \"sources_to_retry\" in response. Please upgrade the Context Chat Backend app to the latest version."}}
{"reqId":"7ZNejdorU17NPPsGrtYM","level":3,"time":"2026-03-10T01:10:04+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","scriptName":"/NextCloud/cron.php","message":"Background jobs: OCA\\ContextChat\\BackgroundJobs\\SubmitContentJob 123958 ended","userAgent":"--","version":"32.0.6.1","occ_command":["/NextCloud/cron.php"],"data":[]}

[TheBest-Name]

Hopefully that is what is needed.
Thank you!

[weltmaister]

I can reproduce what looks like the same failure on an AIO setup, and the backend gives a slightly more specific multipart parser error.

Setup:

• Nextcloud: 32.0.8.2
• AppAPI: 32.0.0
• Context Chat PHP app: 5.3.1
• Context Chat Backend ExApp: 5.3.0
• Backend deployment: AIO ExApp / ghcr.io/nextcloud/context_chat_backend:5.3.0
• Backend config uses pgvector and a remote OpenAI-compatible embedding endpoint

Current stats after running the background jobs:

The indexing is not complete yet.
Total eligible files: 35054
Files in indexing queue: 64087
New files in indexing queue (without updates): 64087
Queued documents (without files): mail__mail => 808
Files successfully sent to backend: 0
Indexed documents: []
Actions in queue: 0
File system events in queue: 0

The backend is reachable:

• /heartbeat returns 200 OK
• /countIndexedDocuments returns 200 OK after toggling the ExApp enabled state
• the backend pgvector DB still has 0 docs and 0 embeddings

The actual indexing submission fails on /loadSources:

PUT /loadSources HTTP/1.1" 400 Bad Request

In context_chat.log the response is:

{
  "code": "400",
  "response": "{\"detail\":\"The Content-Disposition header field \\\"name\\\" must be provided.\"}",
  "route": "/loadSources",
  "method": "PUT",
  "retry": ""
}

That seems related to the multipart parser rather than the embedding service. I checked the PHP app code locally and LangRopeService::indexSources() appears to build multipart parts with name => sources, so maybe the multipart part name is getting lost or rewritten in the AppAPI/HARP/exAppRequest forwarding path before reaching the FastAPI backend.

I also hit the generic PHP-side error:

Error during request to Context Chat Backend (ExApp): Expected keys "loaded_sources" and "sources_to_retry" in response. Please upgrade the Context Chat Backend app to the latest version.

Initially /countIndexedDocuments returned 503 with Context Chat is disabled, enable it from AppAPI to use it; toggling the ExApp disabled/enabled fixed that state, but the /loadSources 400 remains reproducible.

For completeness: context_chat is 5.3.1 while context_chat_backend is 5.3.0. The context_chat app metadata says same major/minor version, and I could not find a ghcr.io/nextcloud/context_chat_backend:5.3.1 image tag, so this may not be just a patch-version mismatch.

[weltmaister]

Update:

After restarting the updated containers and cleaning up the Context Chat queues, file indexing is working again. The backend accepts /loadSources requests for file batches and the document/embedding counters are increasing.

The remaining failing batches were caused by the Mail provider. Although the global Mail setting index_context_chat_default was already set to no, the affected user still had a per-user Mail Context Chat indexing preference enabled. After removing that user preference and clearing the existing mail/mail queue entries, Mail no longer appears in the Context Chat queue.

Current status:

• File indexing works again.
• mail/mail is no longer queued.
• The backend document/embedding counters are increasing.
• The previous multipart error no longer appears for active file indexing batches.
• There are still some unrelated per-file CSV loader errors for non-UTF-8 CSV files.

This suggests that the original multipart error was triggered by Mail provider content rather than normal file indexing.

[TheBest-Name]

What do you mean by restarting updating containers? I didn't realize there was an update.

[kyteinsky]

sorry for the delay in response.

Expected keys "loaded_sources" and "sources_to_retry" in response. Please upgrade the Context Chat Backend app to the latest version.

this misleading error message has been fixed now but not released yet.

"response": "{"detail":"The Content-Disposition header field \"name\" must be provided."}",

I will look into this, and we can probably add some tests in the future so this doesn't break, although manual tests did pass on some systems and mails were indexed.

What do you mean by restarting updating containers? I didn't realize there was an update.

no there wasn't, that looks like AI's response.

{"code":"400","response":"{"detail":"There was an error parsing the body"}","route":"/loadSources","method":"PUT","retry":""}}

@TheBest-Name would you mind providing the logs from the ex-app? They can be downloaded from "admin settings -> Assistant -> Context chat"
and also the output to occ context_chat:stats

[TheBest-Name]

ContextChat statistics:
The indexing is not complete yet.
Total eligible files: 2415
Files in indexing queue: 79
New files in indexing queue (without updates): 79
Queued documents (without files):array (
'mail__mail' => 526,
)
Files successfully sent to backend: 2182
Indexed documents: array (
'files__default' => 2184,
'mail__mail' => 215,
)
Actions in queue: 0
File system events in queue: 0
Sorry my GitHub is not working on my main computer right now so I'm on my phone I have this but I don't have the actual logs of the exapp