访问接口返回400错误

     对于400错误，出现的原因大概有几个。

    一：第一步确认postmen中发送的数据类型是json。比如Headers中Content-Type类型是application/json;或是前端代码Ajax中添加：contentType: 'application/json;charset=UTF-8'；

    二：确认postmen中发送的数据格式是否正确。postmen中经常有人有漏写一对“{}“或是缺少逗号，引号，冒号的小问，好在postmen会自动报错提示； 而在前端中你必须重新包装传入参数为JSON型。使用JSON.stringify(params)将params参数重新包装；

    三：检查参数的类型是否一一对应;

    四：对接接口时，有可能参数的值不匹配，比如说地址不符合实际要求时，可能返回400错误提示；

 

   本人遇到的属于第四种情况，在检查完预报参数类型和数据格式之后，依然报400错误，后来发现是对方地址有验证，有实际的报错信息，但是我们得到的是400错误，怎么解决呢？

   下面贴代码：

   1.预报参数

//创建货件，设置请求参数
        public ShipmentRequest SetRequest(Package package, PBUSPSConfig Config) { var model = new ShipmentRequest(); string[] address1 = new string[] { package.SenderAddress.Address };//发件地址
            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磅等于453.59克
                double weights = Convert.ToDouble(packageInfo.Weight * 1000); //常衡盎司：重量单位。整体缩写为oz.av。 1盎司 = 28.350克
                decimal Weight = Convert.ToDecimal(weights / 28.350);//重量转盎司
 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",//度量单位
                        weight = Weight,//包裹的重量
 }, dimension = new Dimension() { unitOfMeasurement = "IN", length=10, width=4, height=6, irregularParcelGirth = "20"//将此设置为不规则包裹的周长。周长是高度和宽度之和的两倍:
 } }; 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", //大于一磅的包裹，就是这样的值ChangeServiceRequested, 小于一磅的，就空着，不填
                        value=weights > 453.59?"ChangeServiceRequested":"", } }; } return model; }

    2.访问接口返回值

 

 //创建货件，取返回参数   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.处理400错误

 

    4.在得到具体的返回值之后，发现返回值是一个以中括号开头和结尾的字符串类型，添加一个实体类，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; }
    }

以上就是处理400参数的解决方案。

   5.取Token

 //获取Token
        public static string GetToken(PBUSPSConfig Config, Encoding encoding)
        {
            if (encoding == null)
                encoding = Encoding.UTF8;
            //根据Key获取缓存中的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;//键
            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方式必须加的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);// 解码   
            if (result != null)
            {
                if (result.Contains("error"))
                {
                    var OAuthError = SerializeUtil.FromJson<Error>(result);
                    return "服务商:" + 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); // 添加进缓存  有效时间8个小时
                    return access_token;
                }
            }
            return "CMS:服务商返回为空";
        }

   6.“基础连接已经关闭”的错误

 private static void SetCertificatePolicy()
        {
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            // 这里设置了协议类型。
            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; //总是接受  
        }