Why doesn't adding CORS headers to an OPTIONS route allow browsers to access my API?

node.jscorsexpresscoffeescript
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“Origin null is not allowed by Access-Control-Allow-Origin” error for request made by application running from a file:// URL

javascriptjquerycorsxmlhttprequestjsonp
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Origin is not allowed by Access-Control-Allow-Origin

javascriptajaxcorsxmlhttprequestcross-domain
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Cross-Origin Request Headers(CORS) with PHP headers

javascriptphpcorsxmlhttprequest
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Access-Control-Allow-Origin Multiple Origin Domains?

corsxmlhttprequestcross-domain.htaccesshttp
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