How would i safely turn a image from a url to a uri.

[geotre]

I'd recommend posting an easily reproducible example and a clear description of 
what's happening (i.e. don't just say something doesn't work), it'll make it 
easier for people to help you quickly.

This seems to work fine:
    
    
    import std/[httpclient, uri, mimetypes, strformat]
    
    let
      url = 
"https://www.gravatar.com/avatar/bd9201e3d43978e1f9a51ee7bc902312?s=80&d=identicon";
      host = parseUri(url)
      client = newHttpClient(headers=newHttpHeaders({"Referer": $host}))
      rq = client.get(url)
      suffix = newMimetypes().getExt(rq.headers["Content-Type"])
    
    writeFile("index.html", "<img src='" & getDataUri(rq.body, 
&"image/{suffix}") & "' />")
    
    
    Run

If you open the generated index.html file you can see the image was encoded 
successfully.