feat: Add headers to VLLM Passthrough requests [Log success Events]

[LucasSugi]

Title

feat: Add headers to VLLM Passthrough requests [Log success Events]

Relevant issues

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature
🐛 Bug Fix

Changes

I set a breakpoint inside the async_log_success_event function for a CustomLogger. You can check that in kwargs -> litellm_params -> proxy_server_request the headers do not exist.

Here it's after the modifcation, add the header to be retrieve for callback function

Unit test for the function I make changes

Just to concern, you can check the headers I am adding does not have relation to the headers retrieved in the request for client. The x-requester-token for example that appears in the other print is not shown here.

[vercel]

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