Add CORS filter and remove unuse configurations

SE-8-2021 / backend

The backend of 2021 SE class group 8, inherited from the 2020 project.

https://pvs.xcc.tw

MIT License

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Closed VincentETN closed 2 years ago

VincentETN commented 2 years ago

This PR solves CORS problems. Now we can use requests not only GET and POST. For example, PUT, PATCH, DELETE, etc.