listening on http://127.0.0.1:8083
echo:
{meth=GET; host=localhost:8083;
 headers=[user-agent: test
          accept: */*
          host: localhost:8083];
 path="/echo/?a=b&c=d"; body=""; path_components=["echo"];
 query=["c","d";"a","b"]}
(query: "c" = "d";"a" = "b")