Do not reply with Allow-Origin '*' for null Origin
Do not reply with Allow-Origin '*' for null Origin

Otherwise local files do not work because of CORS issues, see https://github.com/sockjs/sockjs-node/issues/177
MrJoes/sockjs-tornado,ImaginationForPeople/sockjs-tornado,ImaginationForPeople/sockjs-tornado,ImaginationForPeople/sockjs-tornado,mrjoes/sockjs-tornado