訪問接口返回400錯誤

     對於400錯誤，出現的原因大概有幾個。

    一：第一步確認postmen中發送的數據類型是json。比如Headers中Content-Type類型是application/json;或是前端代碼Ajax中添加：contentType: 'application/json;charset=UTF-8'；

    二：確認postmen中發送的數據格式是否正確。postmen中經常有人有漏寫一對“{}“或是缺少逗號，引號，冒號的小問，好在postmen會自動報錯提示； 而在前端中你必須重新包裝傳入參數為JSON型。使用JSON.stringify(params)將params參數重新包裝；

    三：檢查參數的類型是否一一對應;

    四：對接接口時，有可能參數的值不匹配，比如說地址不符合實際要求時，可能返回400錯誤提示；

 

   本人遇到的屬於第四種情況，在檢查完預報參數類型和數據格式之后，依然報400錯誤，后來發現是對方地址有驗證，有實際的報錯信息，但是我們得到的是400錯誤，怎么解決呢？

   下面貼代碼：

   1.預報參數

//創建貨件，設置請求參數
        public ShipmentRequest SetRequest(Package package, PBUSPSConfig Config) { var model = new ShipmentRequest(); string[] address1 = new string[] { package.SenderAddress.Address };//發件地址
            string[] address2 = new string[] { !string.IsNullOrWhiteSpace(package.ShippingAddress.Address)? package.ShippingAddress.Address:"", !string.IsNullOrWhiteSpace(package.ShippingAddress.Address2)? package.ShippingAddress.Address2:"" , !string.IsNullOrWhiteSpace(package.ShippingAddress.Address3) ? package.ShippingAddress.Address3:"" };//收件地址
            foreach (var packageInfo in package.PackageInfos) { //1磅等於453.59克
                double weights = Convert.ToDouble(packageInfo.Weight * 1000); //常衡盎司：重量單位。整體縮寫為oz.av。 1盎司 = 28.350克
                decimal Weight = Convert.ToDecimal(weights / 28.350);//重量轉盎司
 model.fromAddress = new Address() { company = package.SenderAddress.CompanyName, name = package.SenderAddress.FirstName, phone = !string.IsNullOrWhiteSpace(package.SenderAddress.PhoneNumber) ? package.SenderAddress.PhoneNumber : package.SenderAddress.Mobile, email = package.SenderAddress.Email, residential = false, addressLines = address1, cityTown = package.SenderAddress.City, stateProvince = package.SenderAddress.Province, postalCode = package.SenderAddress.PostalCode, countryCode = package.SenderAddress.CountryCode, }; model.toAddress = new Address() { company = package.ShippingAddress.CompanyName, name = package.ShippingAddress.FirstName, phone =!string.IsNullOrWhiteSpace(package.ShippingAddress.PhoneNumber)? package.ShippingAddress.PhoneNumber: package.ShippingAddress.Mobile, email = "", residential = false, addressLines = address2, cityTown = package.ShippingAddress.City, stateProvince = !string.IsNullOrWhiteSpace(localityProvincia) ? localityProvincia : package.ShippingAddress.Province, postalCode = package.ShippingAddress.PostalCode, countryCode = package.ShippingAddress.CountryCode, }; model.parcel = new parcel() { weight = new Weight() { unitOfMeasurement = "OZ",//度量單位
                        weight = Weight,//包裹的重量
 }, dimension = new Dimension() { unitOfMeasurement = "IN", length=10, width=4, height=6, irregularParcelGirth = "20"//將此設置為不規則包裹的周長。周長是高度和寬度之和的兩倍:
 } }; model.rates = new rates[] { new rates() { carrier="NEWGISTICS", serviceId="PRCLSEL", parcelType="PKG", specialServices= new SpecialServices[]{ new SpecialServices() { specialServiceId="DelCon" }, new SpecialServices() { specialServiceId="NOTIFICATIONS", inputParameters=new InputParameters[] { new InputParameters(){ name="RECIPIENT_NOTIFICATION_TYPE", value="ON_DELIVER" }, new InputParameters(){ name="RECIPIENT_NOTIFICATION_EMAIL", value="[e-mail]" } } } } } }; model.documents = new documents[] { new documents(){ type="SHIPPING_LABEL", contentType="URL", size="DOC_4X6", fileFormat="PDF", } }; model.shipmentOptions = new shipmentOptions[] { new shipmentOptions(){ name="SHIPPER_ID", value=Config.ShipperId, }, new shipmentOptions(){ name="IS_RECTANGULAR", value="false", }, new shipmentOptions(){ name="CLIENT_FACILITY_ID", value=Config.ClientFacilityId, }, new shipmentOptions(){ name="CARRIER_FACILITY_ID", value=Config.CarrierFacilityId, }, new shipmentOptions(){ name="NON_DELIVERY_OPTION", //大於一磅的包裹，就是這樣的值ChangeServiceRequested, 小於一磅的，就空着，不填
                        value=weights > 453.59?"ChangeServiceRequested":"", } }; } return model; }

    2.訪問接口返回值

 

 //創建貨件，取返回參數   ShipmentResponse
        public string GetResponse(ShipmentRequest ShipmentRequest, string access_token, PBUSPSConfig config)
        {
            var stopWatch = new Stopwatch();
            var Url = config.ForecastUrl + "/shippingservices/v1/shipments?includeDeliveryCommitment=true";
            var TransactionId = GenerateStringID();
            HttpWebRequest request = null;
            if (Url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                request = WebRequest.Create(Url) as HttpWebRequest;
                request.ProtocolVersion = HttpVersion.Version11;
                request.KeepAlive = false;
            }
            else
            {
                request = (HttpWebRequest)WebRequest.Create(Url);
            }
            request.Method = "POST";
            request.ContentType = "application/json";
            request.Accept = "application/json";
            request.AllowAutoRedirect = true;
            request.Headers.Add("Authorization", "Bearer " + access_token);
            request.Headers.Add("X-PB-TransactionId", TransactionId);
            Stream myRequestStream = request.GetRequestStream();    
            StreamWriter myStreamWriter =
                new StreamWriter(myRequestStream, Encoding.GetEncoding("utf-8"));
            var Ship = JsonConvert.SerializeObject(ShipmentRequest);
            byte[] data = Encoding.UTF8.GetBytes(Ship);
            SetCertificatePolicy();
            using (Stream requestStream = request.GetRequestStream())
            {
                requestStream.Write(data, 0, data.Length);
            }
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                Stream myResponseStream = response.GetResponseStream();
                StreamWriter myStreamReader =
                    new StreamWriter(myResponseStream, Encoding.GetEncoding("utf-8"));
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    return reader.ReadToEnd();
                }
            }
        }

 

 

3.處理400錯誤

 

    4.在得到具體的返回值之后，發現返回值是一個以中括號開頭和結尾的字符串類型，添加一個實體類，映射返回值

public class Errors {
        [JsonProperty("errorCode")]
        public string errorCode { get; set; }
        [JsonProperty("message")]
        public string message { get; set; }
        [JsonProperty("parameters")]
        public string[] parameters { get; set; }
    }

以上就是處理400參數的解決方案。

   5.取Token

 //獲取Token
        public static string GetToken(PBUSPSConfig Config, Encoding encoding)
        {
            if (encoding == null)
                encoding = Encoding.UTF8;
            //根據Key獲取緩存中的Auth值
            var cacheKey = "PBUSPSREQUESTTOKEN";
            var cacheResult = Cache.Get<string>(cacheKey);

            if (!string.IsNullOrWhiteSpace(cacheResult))
                return cacheResult;

            var stopWatch = new Stopwatch();
            var Key = Config.Key;//鍵
            var Secret = Config.Secret;//值
            var Token = ForecastHelper.Base64(Key, Secret);
            var Url = Config.ForecastUrl + "/oauth/token";
            string paramStr = "grant_type=client_credentials";

            WebClient wc = new WebClient();
            // 采取POST方式必須加的Header
            wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            wc.Headers.Add("Authorization", "Basic " + Token);
            byte[] postData = encoding.GetBytes(paramStr);
            SetCertificatePolicy();
            byte[] responseData = wc.UploadData(Url, "POST", postData); // 得到返回字符流
            string result = encoding.GetString(responseData);// 解碼   
            if (result != null)
            {
                if (result.Contains("error"))
                {
                    var OAuthError = SerializeUtil.FromJson<Error>(result);
                    return "服務商:" + OAuthError.errors[0].errorDescription;
                }
                else
                {
                    var OAuthresult = SerializeUtil.FromJson<TokenResponse>(result);
                    var access_token = OAuthresult.access_token;//取Auth值 
                    Cache.Add(cacheKey, access_token, 480); // 添加進緩存  有效時間8個小時
                    return access_token;
                }
            }
            return "CMS:服務商返回為空";
        }

   6.“基礎連接已經關閉”的錯誤

 private static void SetCertificatePolicy()
        {
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            // 這里設置了協議類型。
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Ssl3;// SecurityProtocolType.Tls1.2; 
            ServicePointManager.CheckCertificateRevocationList = true;
            ServicePointManager.DefaultConnectionLimit = 100;
            ServicePointManager.Expect100Continue = false;
        }
        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true; //總是接受  
        }