网络连接丢失

Question

我正在使用 Travelpayouts API，不幸的是我得到：

“网络连接丢失”

它曾经工作得很好，我没有改变任何事情，它就开始发生了。我正在使用物理设备。它开始在模拟器和物理设备上显示此错误。有时它可能会起作用，但现在 95% 的时间都不起作用。

func getFlightsRoot(destinationAirports: [Airport], departureAirports: [Airport], destinationAirport: Airport, departureAirport: Airport, departureDate: String, arrivalDate: String, adultsCount: Int, IPAddress: String, budget: Int, isOneWay: Bool, iteration: Int = 0) {
    
    self.destinationAirports = destinationAirports
    self.departureAirports = departureAirports
    
    var flightClass = ""
    if (budget == 1 || budget == 2 || budget == 4) {
        flightClass = "Y"
    } else {
        flightClass = "C"
    }

    var signatureTemp = ""
    var signature = ""
    var segments: [FlightSegment] = []

    if isOneWay {
        signatureTemp = MD5("KEY):beta.aviasales.com:en-us:\(Marker):\(adultsCount):0:0:\(departureDate):\(destinationAirport.iata!):\(departureAirport.iata!):\(flightClass):\(IPAddress)")
        signature = signatureTemp.lowercased()
        segments = [
            FlightSegment(origin: departureAirport.iata!, destination: destinationAirport.iata!, date: departureDate)
        ]
    } else {
        signatureTemp = MD5("\(KEY):beta.aviasales.com:en-us:\(Marker):\(adultsCount):0:0:\(departureDate):\(destinationAirport.iata!):\(departureAirport.iata!):\(arrivalDate):\(departureAirport.iata!):\(destinationAirport.iata!):\(flightClass):\(IPAddress)")
        signature = signatureTemp.lowercased()
        segments = [
            FlightSegment(origin: departureAirport.iata!, destination: destinationAirport.iata!, date: departureDate),
            FlightSegment(origin: destinationAirport.iata!, destination: departureAirport.iata!, date: arrivalDate)
        ]
    }

    let request = FlightRequest(
        signature: signature,
        marker: "\(Marker)",
        host: "beta.aviasales.com",
        userIP: IPAddress,
        locale: "en-us",
        tripClass: flightClass,
        passengers: Passengers(adults: adultsCount, children: 0, infants: 0),
        segments: segments
    )

    let urlString = "https://api.travelpayouts.com/v1/flight_search"
    guard let url = URL(string: urlString) else {
        print("Invalid URL")
        return
    }

    var urlRequest = URLRequest(url: url)
    urlRequest.httpMethod = "POST"

    // Encode request body
    let encoder = JSONEncoder()
    do {
        let jsonData = try encoder.encode(request)
        urlRequest.httpBody = jsonData
    } catch {
        print("Error encoding request: \(error)")
        return
    }

    // Set headers
    urlRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")

   
    
    
    let task = URLSession.shared.dataTask(with: urlRequest) { [weak self] data, response, error in
        guard let data = data, error == nil else {
            
            self?.retryGetFlightsRoot(destinationDate: departureDate, arrivalDate: arrivalDate, adultsCount: adultsCount, IPAddress: IPAddress, budget: budget, isOneWay: isOneWay, iteration: iteration)
            
            print("ERROR in Flights API 1: \(error?.localizedDescription)")
            return
        }

        guard let httpResponse = response as? HTTPURLResponse, (200...299).contains(httpResponse.statusCode) else {
           
            self?.retryGetFlightsRoot(destinationDate: departureDate, arrivalDate: arrivalDate, adultsCount: adultsCount, IPAddress: IPAddress, budget: budget, isOneWay: isOneWay, iteration: iteration)
            
          
            
            print("Error in Flights API 2: \(response as? HTTPURLResponse)")
            return
        }

        do {
            let decoder = JSONDecoder()
            let responseData = try decoder.decode(FlightRootResponse.self, from: data)
            self?.currencyRates = responseData.currency_rates
            self?.searchID = responseData.search_id
            
            self?.getFlights(searchID: responseData.search_id, iteration: iteration, destinationDate: departureDate, arrivalDate: arrivalDate, adultsCount: adultsCount, IPAddress: IPAddress, budget: budget, isOneWay: isOneWay)
        } catch {
           
            self?.retryGetFlightsRoot(destinationDate: departureDate, arrivalDate: arrivalDate, adultsCount: adultsCount, IPAddress: IPAddress, budget: budget, isOneWay: isOneWay, iteration: iteration)
        }
    }

    task.resume()
}

航班 API 1 中的错误：可选（“网络连接丢失。”）

Answer 1

我要向您指出的主要资源在这里：

https://developer.apple.com/library/archive/qa/qa1941/_index.html#//apple_ref/doc/uid/DTS40017602

您可能需要查看服务器端日志，因为如果这种情况频繁发生，则连接可能在服务器端关闭，而不是由网络错误引起。 那个人或某人启用了低数据模式。关闭您的应用程序的蜂窝网络访问，或关闭数据漫游。

另一种可能性是，您上传的数据本身随着时间的推移而发生了变化，并且已经变得如此之大，以至于您很可能在缓慢的蜂窝链路上上传超时。

如果这些都不适用，那么您真正能做的唯一事情就是使用网络分析器捕获数据包跟踪，看看您是否可以弄清楚发生了什么，可以选择插入诸如 Charles Proxy 内联之类的东西来捕获更多数据，然后将其归档针对 iOS 的一个错误，假设它不是服务器端回归。