为什么我的HTTP标头不起作用？

Question

我想通过我已经拥有的Bearer进行身份验证，但它始终返回[“error”：Unauthenticated。]。如果我使用相同的标题和Bearer与Postman我得到了我期待的。知道为什么我的标题不起作用吗？

private func getAllData() {

    guard let url = URL(string: "http://afit.herokuapp.com/api/user/") else { return }

    let request: URLRequest = createRequestForData(withURL: url)
    for i in request.allHTTPHeaderFields! {
        print(i)
        print("\n")
    }

    DownloadsManager.sharedInstance.getJSONData(fromURLRequest: request) { (responseDictionary) in
        print(responseDictionary)
    }
}

private func createRequestForData(withURL url: URL) -> URLRequest {
    var request = URLRequest(url: url)
    request.httpMethod = "GET"
    request.addValue("application/json", forHTTPHeaderField: UserHeader.Accept.rawValue)
    request.addValue("application/json", forHTTPHeaderField: UserHeader.Content_type.rawValue)
    request.addValue("Bearer \(bearer!)", forHTTPHeaderField: UserHeader.Authorization.rawValue)
    return request
}