Request log with curl (swift3)

URLRequest+crul.swift

extension URLRequest {
    var curlDescription: String {
        get {
            var displayString = "curl -v -X \(self.httpMethod!)"
            if let absoluteUrl = self.url?.absoluteString {
                displayString += " '\(absoluteUrl)'"
            }
            if let allHTTPHeaderFields = self.allHTTPHeaderFields {
                let allHeadersKeys = Array(allHTTPHeaderFields.keys)
                let sortedHeadersKeys  = allHeadersKeys.sorted()
                for key in sortedHeadersKeys {
                    displayString += " -H '\(key): \(self.value(forHTTPHeaderField: key)!)'"
                }
            }
            if self.httpMethod == "POST" ||
                self.httpMethod == "PUT" ||
                self.httpMethod == "PATCH", let body = self.httpBody {
                if let bodyString = String(data: body, encoding: String.Encoding.utf8) {
                    displayString += " -d '\(bodyString)'"
                }
            }
            return displayString
        }
    }
}