fix: strip X-Stainless headers and normalize SDK User-Agent (closes #597) - #656
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…AI-compatible requests (closes decolua#597)
This was referenced May 1, 2026
diegosouzapw
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Jun 26, 2026
…r OpenAI-compatible endpoints OpenAI SDK clients attach X-Stainless-* metadata headers and verbose SDK-derived User-Agent strings. Some upstream gateways 403 on these SDK-identifying headers. Strip them and normalize the User-Agent on the OpenAI-compatible passthrough path (Chat Completions / Responses / openai-compatible-* providers) via pure, unit-tested helpers wired into BaseExecutor.execute(). The isOpenAICompatibleEndpoint guard is kept narrow so Claude / Claude-Code compat paths — which legitimately ADD X-Stainless-* — are untouched. Co-authored-by: Anurag Saxena <anuragg.saxenaa@gmail.com> Inspired-by: decolua/9router#656
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Summary
Requests from the official OpenAI Node SDK fail with 403 when routed through 9router, because upstream gateways block requests carrying OpenAI SDK metadata headers.
The fix strips X-Stainless-* headers and normalizes the User-Agent header to a clean browser-like string for OpenAI-compatible endpoints.
What changed
open-sse/executors/base.js
Closes OpenAI-compatible endpoint blocks requests from official OpenAI Node SDK unless SDK metadata headers are suppressed #597