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fix: preserve llm_provider-* headers in error responses - #19020
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Extract and preserve provider-specific headers (llm_provider-*) when handling error responses from LLM providers. This ensures that useful debugging information from providers is available even when requests fail with BadRequestError or similar exceptions.
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Failing tests are unrelated to these changes. |
…-headers-on-errors # Conflicts: # litellm/proxy/common_request_processing.py
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Jun 24, 2026
Extract and preserve provider-specific headers (llm_provider-*) when handling error responses from LLM providers. This ensures that useful debugging information from providers is available even when requests fail with BadRequestError or similar exceptions.
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Preserves llm_provider-* headers in error responses returned to clients. Previously, when an LLM provider returned an error (e.g., BadRequestError), any useful debugging headers from the provider's response were lost.
Problem
When LiteLLM catches provider exceptions and re-raises them as typed exceptions (e.g., BadRequestError, ContentPolicyViolationError), the original response headers were being discarded. This meant clients couldn't access provider-specific debugging information that was included in error response headers.
Solution
Relevant issues
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-unitCI (LiteLLM team)
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Type
🐛 Bug Fix
Changes