perf(node-http-handler): cache 100-continue agents at module level#1986
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trivikr wants to merge 2 commits into
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perf(node-http-handler): cache 100-continue agents at module level#1986trivikr wants to merge 2 commits into
trivikr wants to merge 2 commits into
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kuhe
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Apr 29, 2026
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kuhe
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reusing an agent could resurface the bug that originally necessitated creating a new agent.
We should prove that the original issue (internal repro is available) is fixed before merging this change.
If it is fixed, creating a separate agent may be unnecessary to begin with.
In any case this is partially mitigated by the byte length check before enabling 100-continue in S3.
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Issue #, if available:
Improving HttpHandler performance before benchmarking with undici handler
Description of changes:
Replaces per-request Agent creation for 100-continue requests with lazily initialized module-level singletons.
Workloads that send many 100-continue requests (e.g., S3 PutObject) were creating a new Agent per request, causing significant GC pressure. A single cached agent per protocol (HTTP/HTTPS) is now reused across all handler instances.
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