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="widgets@example.com"
}
}
}
}
}
};
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
1 //创建货件，取返回参数 ShipmentResponse 2 public string GetResponse(ShipmentRequest ShipmentRequest, string access_token, PBUSPSConfig config) 3 { 4 var stopWatch = new Stopwatch(); 5 var Url = config.ForecastUrl + "/shippingservices/v1/shipments?includeDeliveryCommitment=true"; 6 var TransactionId = GenerateStringID(); 7 HttpWebRequest request = null; 8 if (Url.StartsWith("https", StringComparison.OrdinalIgnoreCase)) 9 { 10 request = WebRequest.Create(Url) as HttpWebRequest; 11 request.ProtocolVersion = HttpVersion.Version11; 12 request.KeepAlive = false; 13 } 14 else 15 { 16 request = (HttpWebRequest)WebRequest.Create(Url); 17 } 18 request.Method = "POST"; 19 request.ContentType = "application/json"; 20 request.Accept = "application/json"; 21 request.AllowAutoRedirect = true; 22 request.Headers.Add("Authorization", "Bearer " + access_token); 23 request.Headers.Add("X-PB-TransactionId", TransactionId); 24 Stream myRequestStream = request.GetRequestStream(); 25 StreamWriter myStreamWriter = 26 new StreamWriter(myRequestStream, Encoding.GetEncoding("utf-8")); 27 var Ship = JsonConvert.SerializeObject(ShipmentRequest); 28 byte[] data = Encoding.UTF8.GetBytes(Ship); 29 SetCertificatePolicy(); 30 using (Stream requestStream = request.GetRequestStream()) 31 { 32 requestStream.Write(data, 0, data.Length); 33 } 34 using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) 35 { 36 Stream myResponseStream = response.GetResponseStream(); 37 StreamWriter myStreamReader = 38 new StreamWriter(myResponseStream, Encoding.GetEncoding("utf-8")); 39 using (StreamReader reader = new StreamReader(response.GetResponseStream())) 40 { 41 return reader.ReadToEnd(); 42 } 43 } 44 }
3.处理400错误 (catch)
1 HttpWebResponse response = (HttpWebResponse)ex.Response; 2 var message = ""; 3 if (response?.StatusCode == HttpStatusCode.BadRequest) 4 { 5 using (Stream data = response.GetResponseStream()) 6 { 7 using (StreamReader reader = new StreamReader(data)) 8 { 9 string text = reader.ReadToEnd(); 10 var jo = JsonConvert.DeserializeObject<List<Errors>>(text); 11 var json = jo.First(); 12 message = "服务商:" + json.message; 13 } 14 } 15 }
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
1 public class Errors { 2 [JsonProperty("errorCode")] 3 public string errorCode { get; set; } 4 [JsonProperty("message")] 5 public string message { get; set; } 6 [JsonProperty("parameters")] 7 public string[] parameters { get; set; } 8 }
以上就是处理400参数的解决方案。
5.“基础连接已经关闭”的错误
1 private static void SetCertificatePolicy() 2 { 3 ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); 4 // 这里设置了协议类型。 5 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Ssl3;// SecurityProtocolType.Tls1.2; 6 ServicePointManager.CheckCertificateRevocationList = true; 7 ServicePointManager.DefaultConnectionLimit = 100; 8 ServicePointManager.Expect100Continue = false; 9 } 10 private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) 11 { 12 return true; //总是接受 13 }