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fix: make user-agent header check case-insensitive

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The setting disable_add_user_agent_to_request_tags was not working
when headers used capitalized keys like 'User-Agent' instead of
lowercase 'user-agent'. HTTP headers are case-insensitive per RFC 7230,
so we now iterate through all header keys and match case-insensitively.

Fixes #23553
This commit is contained in:
SparkLabScout 2026-03-13 22:20:11 +08:00
parent 1df71606a3
commit 095f5e8399
1 changed files with 15 additions and 11 deletions
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26
litellm/litellm_core_utils/litellm_logging.py
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@ -5063,18 +5063,22 @@ class StandardLoggingPayloadSetup:
user_agent_tags: Optional[List[str]] = None
headers = proxy_server_request.get("headers", {})
if headers is not None and isinstance(headers, dict):
if "user-agent" in headers:
user_agent = headers["user-agent"]
# Check for case-insensitive "user-agent" header key
user_agent = None
for key in headers:
if key.lower() == "user-agent":
user_agent = headers[key]
break
if user_agent is not None:
if user_agent_tags is None:
user_agent_tags = []
user_agent_part: Optional[str] = None
if "/" in user_agent:
user_agent_part = user_agent.split("/")[0]
if user_agent_part is not None:
user_agent_tags.append("User-Agent: " + user_agent_part)
if user_agent is not None:
if user_agent_tags is None:
user_agent_tags = []
user_agent_part: Optional[str] = None
if "/" in user_agent:
user_agent_part = user_agent.split("/")[0]
if user_agent_part is not None:
user_agent_tags.append("User-Agent: " + user_agent_part)
if user_agent is not None:
user_agent_tags.append("User-Agent: " + user_agent)
user_agent_tags.append("User-Agent: " + user_agent)
return user_agent_tags
@staticmethod