Figure 20.4: The defensive plumbing between your traffic and the provider’s limit
Figure 20.4 The defensive plumbing between your traffic and the provider's limit. Incoming
requests are buffered in a queue and metered through a concurrency cap; the provider
limit is a wall with one narrow doorway, and overflow comes back as a 429 that triggers
backoff and retry. The accented signal is backpressure itself, travelling upstream to
slow new work rather than hammering the wall.
