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debug-server-next

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Dev server for hippy-core.

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# Ensure preflight responses are valid A cross-origin resource sharing (CORS) request was blocked because the response to the associated [preflight request](issueCorsPreflightRequest) had an unsuccessful HTTP status code and/or was a redirect. To fix this issue, ensure all CORS preflight `OPTION` requests are answered with a successful HTTP status code (2xx) and do not redirect.