if err != nil {
				t.Errorf("On test %#v, error writing request headers: %v", test, err)
				return
			}
			if writeBody {
				var targ io.WriteCloser = struct {
					io.Writer
					io.Closer
				}{
					conn,
					io.NopCloser(nil),
				}
				if test.chunked {
					targ = httputil.NewChunkedWriter(conn)
				}
				body := strings.Repeat("A", test.contentLength)

* ♻ Change a `dict()` for `{}` in `fastapi/utils.py`. PR [#3138](https://github.com/tiangolo/fastapi/pull/3138) by [@ShahriyarR](https://github.com/ShahriyarR).
* ♻ Move internal variable for errors in `jsonable_encoder` to put related code closer. PR [#4560](https://github.com/tiangolo/fastapi/pull/4560) by [@GuilleQP](https://github.com/GuilleQP).