可以使用以下代码示例来解决这个问题：

let sessionManager = Session.default

sessionManager.adapter = AccessTokenAdapter()

sessionManager.interceptor = Interceptor(retryPolicy: .retry, adapters: [BearerTokenInterceptor()])

class BearerTokenInterceptor: RequestInterceptor {
    func adapt(_ urlRequest: URLRequest, for session: Session, completion: @escaping (Result) -> Void) {
        // Check if the request needs to be authenticated
        guard let urlString = urlRequest.url?.absoluteString else {
            return completion(.failure(AFError.parameterEncodingFailed(reason: .missingURL)))
        }

        let urlStringWithoutParameters = urlString.components(separatedBy: "?").first ?? urlString
        if !urlStringWithoutParameters.contains("/api/") {
            // This is a public request - no need to add authentication headers
            return completion(.success(urlRequest))
        }

        // This is a private request - add authentication headers
        guard let accessToken = AuthManager.shared.accessToken else {
            return completion(.failure(AFError.sessionDeinitialized))
        }

        var updatedRequest = urlRequest
        updatedRequest.setValue("Bearer \(accessToken)", forHTTPHeaderField: "Authorization")

        completion(.success(updatedRequest))
    }
}

class AccessTokenAdapter: RequestAdapter {
    func adapt(_ urlRequest: URLRequest, for session: Session, completion: @escaping (Result) -> Void) {
        guard let accessToken = AuthManager.shared.accessToken else { return completion(.success(urlRequest)) }

        var urlRequest = urlRequest
        urlRequest.setValue("Bearer \(accessToken)", forHTTPHeaderField: "Authorization")
        completion(.success(urlRequest))
    }
}

上面的代码定义了一个 Interceptor 对象，包含了一个 BearerTokenInterceptor 对象和一个重试策略。BearerTokenInterceptor 实现了 RequestInterceptor 协议，它的 adapt 方法在检查请求是否需要身份验证之后，要么添加身份验证头部，要么返回未更改的请求对象。AccessTokenAdapter 实现了 RequestAdapter 协议，用于设置访问令牌头部。在这里，我们将 `