snippet.swift

webServer?.addHandler(forMethod: "GET",  pathRegex: "(.*?).mp4", request: GCDWebServerRequest.self, asyncProcessBlock: { request, completion in
    let filename = request.url.lastPathComponent
	  let clipFileSize = getClipFileSize()
    let response = GCDWebServerStreamedResponse(contentType: "video/mp4", asyncStreamBlock: { block in
			/// Fetch data 
    })

    let disposition = "attachment; filename=\"\(filename)\""
    response.setValue(disposition, forAdditionalHeader: "Content-Disposition")
    response.setValue("video/mp4", forAdditionalHeader: "Content-Type")
    response.setValue("bytes", forAdditionalHeader: "Accept-Ranges")
    response.setValue("keep-alive", forAdditionalHeader: "Connection")
    if request.hasByteRange() && request.byteRange.length > 0 {
        response.statusCode = 206
        response.setValue("bytes \(byteRangeString)/\(clipFileSize)", forAdditionalHeader: "Content-Range")
        let length = UInt(request.byteRange.length)
        response.contentLength = length
    } else {
        response.statusCode = 200
        response.contentLength = clipFileSize
    }
    completion(response)
})