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fix(fallback): preserve provider-specific headers when activating fallback

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When _try_activate_fallback() swaps to a new provider (e.g.
kimi-coding), resolve_provider_client() correctly injects
provider-specific default_headers (like KimiCLI User-Agent) into the
returned OpenAI client. However, _client_kwargs was saved with only
api_key and base_url, dropping those headers.

Every subsequent API call rebuilds the client from _client_kwargs via
_create_request_openai_client(), producing a bare OpenAI client without
the required headers. Kimi Coding rejects this with 403; Copilot would
lose its auth headers similarly.

This patch reads _custom_headers from the fallback client (where the
OpenAI SDK stores the default_headers kwarg) and includes them in
_client_kwargs so any client rebuild preserves provider-specific headers.

Fixes #6075
This commit is contained in:
Yang Zhi 2026-04-08 16:18:07 +08:00 • committed by Teknium
parent fce23e8024
commit 019c11d07e
1 changed files with 12 additions and 0 deletions
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12
run_agent.py
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@ -4968,9 +4968,21 @@ class AIAgent:
# Swap OpenAI client and config in-place
self.api_key = fb_client.api_key
self.client = fb_client
# Preserve provider-specific headers that
# resolve_provider_client() may have baked into
# fb_client via the default_headers kwarg. The OpenAI
# SDK stores these in _custom_headers. Without this,
# subsequent request-client rebuilds (via
# _create_request_openai_client) drop the headers,
# causing 403s from providers like Kimi Coding that
# require a User-Agent sentinel.
fb_headers = getattr(fb_client, "_custom_headers", None)
if not fb_headers:
fb_headers = getattr(fb_client, "default_headers", None)
self._client_kwargs = {
"api_key": fb_client.api_key,
"base_url": fb_base_url,
**({"default_headers": dict(fb_headers)} if fb_headers else {}),
}
# Re-evaluate prompt caching for the new provider/model