Nous.HTTP.StreamBackend.Req (nous v0.15.6)
View SourceNous.HTTP.StreamBackend implementation backed by Req (Finch
underneath).
Default streaming backend. Drives Req.post/1 with the :into
callback so chunks are pushed into a Task, which forwards them to
the consuming Stream.resource via send/2.
Backpressure
Req's :into callback runs in the spawned Task. Forwarding to the
consumer process is send/2, so a fast producer + slow consumer can
grow the consumer's mailbox unboundedly. This is acceptable for
typical LLM workloads where token-generation rate is the bottleneck
and consumers are parsing-bound (parsing throttles naturally).
Callers whose downstream consumers can block per chunk (LiveView
fan-out under load, persistence-on-every-chunk, slow IO) should use
Nous.HTTP.StreamBackend.Hackney instead, which provides strict
pull-based backpressure via :hackney's {:async, :once} mode.
TLS verification
Req's defaults handle TLS verification via Mint/Finch (system CAs with peer verification). No additional configuration needed.