douhua1890 2017-10-23 12:56
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Golang http写响应而无需等待完成

I'm building an application that builds a pdf file and returns it to the client whenever it receives a request.

Since some of these pdf files might take some time to generate, I would like to periodically send some sort of status update back to client while it is running.

When it's finished building the pdf file, it should be returned to the client as well.

Something akin to:

func buildReport(writer http.ResponseWriter, request *http.Request){
    //build pdf build pdf file
    for { //for example purposes only
        writer.Write([]byte("building. Please wait."))
    //set header to pdf so that the client knows it's a PDF
    writer.Header().Set("Content-Type", "application/pdf")
    http.ServeFile(writer, request, "report.pdf")

func main() {
    http.HandleFunc("/", buildReport)
    http.ListenAndServe(":8081", nil)

Setting the header might not work, as the writer can only have one header.

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