fix: undefined offset (#4)

* fix: undefined offset

close swlib/saber#100

* add getLastKey

* refactor: getRedirectsTrace

* fix typo

* fix typo

* fix typo

Fix the test

Merge pull request #1 from fdreamsu/master

Fix getRequestTarget() to make it support queryParams

Merge pull request #1 from fdreamsu/master

Fix getRequestTarget() to make it support queryParams

Remove FnStream tests.

Fix null response.

Improve stream clear and overWrite.

Improve stream clear and overWrite.

Update composer.