[Fix] Prevent atexit flush hangs and guard proxy_server_request header lookup#26470

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yuneng-berri wants to merge 7 commits intolitellm_internal_stagingfrom

litellm_fix_atexit_flush_attribute_error

Commits on Apr 24, 2026

Merge pull request #26375 from BerriAI/litellm_internal_staging
yuneng-berri
authored
[Feat] Day-0 support for GPT-5.5 and GPT-5.5 Pro (#26449)
mateo-berri
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