function loginAlfresco(user, pass)
{
    return fetch(alfrescoLocal + "api/login",
    {
        method: 'post',
        dataType: 'json',
        body: JSON.stringify(
        {
            username: user,
            password: pass
        })
    })
    .then((res) => res.json())
    .then(data => alert(data))
    .catch(error => alert("Error" + error))
};

loginAlfresco() {
     loginAlfresco(this.state.username, this.state.password)
        .then((data) =>
          this.setState({ticket: data})
        ).catch((error) =>
          alert(error)
        )
};