axios doesn't set custom header

I have my http class which uses axios, and it has a method for setting authorization token into headers:

export class Http { constructor(private readonly _axios: AxiosInstance) { this.useInterceptors(); } setAuthorizationHeader(token: string): void { this._axios.defaults.headers.common.Authorization = `Bearer ${token}`; } unsetAuthorizationHeader(): void { delete this._axios.defaults.headers.common.Authorization; } private useInterceptors(): void { this._axios.interceptors.response.use( undefined, (error: AxiosError): Promise<AxiosError> => { if (error.response?.status === 401) { store.dispatch(actions.auth.signOut()); } return Promise.reject(error.response?.data); }, ); } get get() { return this._axios.get; } get post() { return this._axios.post; } get put() { return this._axios.put; } get patch() { return this._axios.patch; } get delete() { return this._axios.delete; } get request() { return this._axios.request; } get axios(): AxiosInstance { return this._axios; } } export const http = new Http( axios.create({ baseURL: API_URL, timeout: 60000, }), ); 

also I have my middleware for authorization:

export const authMiddleware = () => (next: Dispatch) => (action: AnyAction): AnyAction => { if (action.type === 'client/code/fulfilled') { action.payload?.token && http.setAuthorizationHeader(action.payload.token); } if (action.type === REHYDRATE) { action.payload?.auth?.token && http.setAuthorizationHeader(action.payload.auth.token); } if (action.type === actions.auth.signOut.type) { http.unsetAuthorizationHeader(); } return next(action); }; 

And I have a problem, when I console.log axios common headers I don't see there Authorization. What could be a cause of this?