Дима

// componentA.jsx
class ComponentA extends React.PureComponent {
    state = {
        mounted: false
    }

    removeB = () => {
        this.setState({ mounted: !this.state.mounted })
    }

    render() {
        let { mounted } = this.state
        return <div>
            {
                (mounted) ? <ComponentB /> : <ComponentC onClick={this.removeB} />
            }
        </div>
    }
}


// componentB.jsx
class ComponentB extends React.PureComponent {
    render() {
        return <div>ComponentB</div>
    }
}

// componentC.jsx
class ComponentC extends React.PureComponent {
    render() {
        return <button onClick={this.props.onClick}>ComponentC click me</button>
    }
}

componentDidMount() {
        const myHeaders = new Headers({
            "Content-Type": "application/json",
            Accept: "application/json"
        })

        var self = this

        fetch("https://jsonplaceholder.typicode.com/todos/1", { // ваш URL
            headers: myHeaders,
        }).then(response => {
            return response.json();
        }).then(data => {
            self.setState({ data });
        })
    }