fix(lm_studio): resolve illegal Bearer header value issue #14512
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- Change default API key from space ' ' to 'fake-api-key' - Fixes httpcore.LocalProtocolError: Illegal header value b'Bearer ' - Maintains compatibility with explicit API keys and environment variables - Add comprehensive tests for provider info retrieval Fixes BerriAI#14502
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Title
fix(lm_studio): resolve illegal Bearer header value issue
Relevant issues
Fixes #14502
Pre-Submission checklist
Please complete all items before asking a LiteLLM maintainer to review your PR
tests/litellm/directory, Adding at least 1 test is a hard requirement - see detailsmake test-unitType
🐛 Bug Fix
Changes
Problem
Users couldn't use LMStudio locally due to
httpcore.LocalProtocolError: Illegal header value b'Bearer 'when no API key was set. The issue was caused by the default API key being a single space" ", which created an illegal HTTP Authorization headerBearer(Bearer followed by two spaces).Root Cause
In
litellm/llms/lm_studio/chat/transformation.py, the default API key was set to" "(space) to satisfy OpenAI client requirements, but this created malformed HTTP headers.Solution
" "to"fake-api-key"hosted_vllm)Authorization: Bearer fake-api-keyTesting
Impact