throw on empty target

Author: ruslandoga

lib/mint/http1/request.ex

@@ -17,6 +17,7 @@ defmodule Mint.HTTP1.Request do
   end
 
   defp encode_request_line(method, target) do
+    validate_target!(target)
     [method, ?\s, target, " HTTP/1.1\r\n"]
   end
 
@@ -45,6 +46,9 @@ defmodule Mint.HTTP1.Request do
     [Integer.to_string(length, 16), "\r\n", chunk, "\r\n"]
   end
 
+  defp validate_target!("" = target), do: throw({:mint, {:invalid_target, target}})
+  defp validate_target!(_target), do: :ok
+
   defp validate_header_name!(name) do
     _ =
       for <<char <- name>> do