我试图创建一个通用的URLRequest创建函数，但我的实现在没有主体时给我一个错误。我该怎么解决这个问题？

guard let request: URLRequest = RequestMaker.requestMaker(url: followUser, method: .get) else { return false }

给出此错误：Generic parameter 'T' could not be inferred

class RequestMaker {
    static func makeRequest<T: Encodable>(
        url: String,
        method: HTTPMethod,
        _ body: T? = nil
    ) -> URLRequest? {
        guard let url: URL = .init(string: url) else { return nil }
        var request: URLRequest = .init(url: url)
        request.httpMethod = method.rawValue
        request.addAuthorizationHeader()
        request.timeoutInterval = 15.0
                
        if let body: T = body {
            request.httpBody = try? JSONEncoder().encode(body)
        }
        
        return request
    }
}