Web Development

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Handling large bursts of POST requests to your ActivityPub inbox, using a buffer in Nginx (join.piefed.social)

submitted 8 months ago by [email protected] to c/webdev

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Fediverse traffic is pretty bursty and sometimes there will be a large backlog of Activities to send to your server, each of which involves a POST. This can hammer your instance and overwhelm the backend’s ability to keep up. Nginx provides a rate-limiting function which can accept POSTs at full speed and proxy them slowly through to your backend at whatever rate you specify.

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[–] [email protected] 2 points 8 months ago* (last edited 8 months ago) (1 children)

A HTTP 200 response is sent immediately. There is a small risk of data loss but only during the time when rate limiting is happening. Most instances behave well and only send activities at a sensible rate but when things go wrong we need to avoid the bad effects caused by those that are mis-configured or under attack.

It's not a perfect solution. But the alternative - fail to accept some activities, causing them to retry later and us to slowly fall more and more behind - is worse.

[–] [email protected] 1 points 8 months ago

Thanks for the clarification! I’m inclined to agree here, small risk of data loss but failing to receive updates all together during peak burst is probably much worse.