Merge branch 'add-download-param' into 'master'

Add a query param to force files to download

See merge request whats-this/cdn-origin!10

main.go

@@ -486,6 +486,9 @@ func requestHandler(ctx *fasthttp.RequestCtx) {
 		} else {
 			ctx.SetContentType("application/octet-stream")
 		}
+		if ctx.QueryArgs().Has("download") {
+			ctx.Response.Header.Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, key))
+		}
 		ctx.Response.Header.Set("ETag", fmt.Sprintf(`"%s"`, *object.SHA256Hash))
 		fasthttp.ServeFileUncompressed(ctx, fPath)