Update CORS implementation

[MigrainePanda]

Pull Request

Description

Updates CORS options on core and socket servers to include more methods and the necessary origins.

Fixes #354

Checklist:

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• I have performed a self-review of my own code.
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• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
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[thaivinhle]

Approved. Looks like a solid fix for the CORS methods on both core and socket servers. Thanks!