need Access-Control-Expose-Headers: Content-Disposition header in ServeFileDownload

[wohenbushuang]

gf/net/ghttp/ghttp_response.go

Lines 89 to 94 in 8669512

	}
	r.Header().Set("Content-Type", "application/force-download")
	r.Header().Set("Accept-Ranges", "bytes")
	r.Header().Set("Content-Disposition", fmt.Sprintf(`attachment;filename=%s`, url.QueryEscape(downloadName)))
	r.Server.serveFile(r.Request, serveFile)
	}

As mentioned in axios/axios#895 and https://stackoverflow.com/questions/43912862/axios-expose-response-headers-content-disposition , the server side has to enable CORS-related feature for axios request to read Content-Disposition header, so the file can be downloaded with the given filename.