将Base64字符串转换为PNG图像并作为http响应进行响应-Go语言

Question

I am trying to convert a base64 encoding to a png image and ouput the image as response for a web request. Can I do this without creating a file in the server?

the 'ServeFile' of http works only when the image is saved as a file. but, I would like to decode the base64 string to image data and then directly write that to the output.

thanks.

Answer 1

Using base64.NewDecoder, for example :

func Handler(res http.ResponseWriter, req *http.Request) {
    //in this example the client submits the base64 image, however
    // you can use any io.Reader and pass it to NewDecoder.
    dec := base64.NewDecoder(base64.StdEncoding, req.Body)
    res.Header().Set("Content-Typee", "image/png")
    io.Copy(res, dec)
}