Add Access-Control-Allow-Headers to RPC responses #244
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This allows cross-origin requests in a sandboxed environment sending CORS-safelisted request headers such as
Content-Type.More headers can be allowed in the future or we can echo back the request's
Access-Control-Request-Headersif it exists, but this is a start.Allowing any header using
*is not well supported.See: https://stackoverflow.com/a/13147554