Refactoring was done.#5

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Dmk88 wants to merge 3 commits intovelmie:masterfrom

Commits on Mar 20, 2020

Refactoring: Spread was added.
Dmitry Mikhalchenko
committed
Refactoring: Variables type were resolved.
Dmitry Mikhalchenko
committed
AuthorizationFailedError was added. And error response logging was fixed.
Dmitry Mikhalchenko
committed