Modify CORS to allow single "Methods" header

[baohx2000]

Description

Currently, our CORS service injects 2 Access-Control-Allow-Methods headers if there are multiple methods for an endpoint. Hipache inconveniently throws one of them away.

Add a CorsServiceProvider based on the current package, but where it adds the above header, just implode the allowed methods with a comma.

Details

• Credentials: {{username / password (remove if not applicable)}}
• URL: {{url where problem occurs, remove if not applicable}}
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