Downloading a file and showing progress via curl.

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Hello everyone,
I found this snippet on 
https://dlang.org/phobos/std_net_curl.html#.HTTP

import std.net.curl : HTTP;
import std.stdio : writeln;

void main()
{
    auto http = HTTP();
    // Track progress
    http.method = HTTP.Method.get;
    http.url = 
"https://upload.wikimedia.org/wikipedia/commons/5/53/Wikipedia-logo-en-big.png";;
    http.onReceive = (ubyte[] data) { return data.length; };
    http.onProgress = (size_t dltotal, size_t dlnow, size_t 
ultotal, size_t ulnow) {
        writeln("Progress ", dltotal, ", ", dlnow, ", ", 
ultotal, ", ", ulnow);
        return 0;
    };
    http.perform();
}

This snippet is showing Download Progress in bytes, but I'm 
unsure how to save the
downloaded file into filesystem after download is completed.