[Bug]: --api-key argument ignored when VLLM_API_KEY is set #15568
Description
Your current environment
By convention, environment variables take lower precedence than command line arguments. However, for the vLLM API key, the precedence is reversed resulting in unexpected behavior when both are specified.
Example
VLLM_API_KEY=123 vllm serve --api-key ABC
Expected behavior: API Key = "ABC"
Observed behavior: API Key = "123"
🐛 Describe the bug
Example
VLLM_API_KEY=123 vllm serve --api-key ABC
Expected behavior: API Key = "ABC"
Observed behavior: API Key = "123"
Other environment variables should also be checked to ensure the expected precedence order is applied.
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