为什么我用HttpWebReponse得到一个错误的请求(代码400)？
Jul*_*air 5 .net c# wcf json webrequest
我正在向WCF服务器应用程序发送一个简单的json消息.
Json消息:
{"Name":"Julian", "Id":123}
客户端代码:
public string MakeRequest(string parameters)
{
Console.WriteLine("parameters:" + parameters);
var request = (HttpWebRequest)WebRequest.Create(EndPoint);
request.Method = Method.ToString();
request.ContentLength = 0;
request.ContentType = ContentType;
Console.WriteLine("request: " + request.Headers.ToString());
if (PostData != null && Method == HttpVerb.POST)
{
var encoding = new UTF8Encoding();
var bytes = ObjectToByteArray(PostData);
request.ContentLength = bytes.Length;
Console.WriteLine("Content length: " + request.ContentLength);
using (var writeStream = request.GetRequestStream())
{
writeStream.Write(bytes, 0, bytes.Length);
}
}
try
{
using (var response = (HttpWebResponse)request.GetResponse())
{
var responseValue = string.Empty;
if (response.StatusCode != HttpStatusCode.OK)
{
var message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);
throw new ApplicationException(message);
}
// grab the response
using (var responseStream = response.GetResponseStream())
{
if (responseStream != null)
using (var reader = new StreamReader(responseStream))
{
responseValue = reader.ReadToEnd();
}
}
return responseValue;
}
}
catch (WebException exception)
{
string responseText;
using (var reader = new StreamReader(exception.Response.GetResponseStream()))
{
responseText = reader.ReadToEnd();
return responseText;
}
}
private byte[] ObjectToByteArray(object obj)
{
if (obj == null)
return null;
BinaryFormatter bf = new BinaryFormatter();
using (MemoryStream ms = new MemoryStream())
{
bf.Serialize(ms, obj);
return ms.ToArray();
}
}
服务器端代码:
[WebInvoke(Method = "POST",
ResponseFormat = WebMessageFormat.Json,
RequestFormat =WebMessageFormat.Json,
UriTemplate = "/postdata")]
public Person PostData(Person data)
{
//Return new person with data inputted from json message
return new Person()
{
Id = data.Id,
Name = data.Name
};
}
服务器的配置文件
<?xml version="1.0"?>
<configuration>
<system.serviceModel>
<services>
<service name="WcfJsonRestService.Service1" behaviorConfiguration="Metadata">
<host>
<baseAddresses>
<add baseAddress="http://localhost:8732/service1"/>
</baseAddresses>
</host>
<endpoint address="http://localhost:8732/service1"
binding="webHttpBinding"
contract="WcfJsonRestService.IService1"/>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="Metadata">
<serviceMetadata httpGetEnabled="true" policyVersion="Policy15"/>
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior>
<webHttp />
</behavior>
</endpointBehaviors>
</behaviors>
</system.serviceModel>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
</configuration>
关于代码:
- (客户端)MakeRequest方法的输入只是上面显示的json数据.
- (客户端)被发布的Uri只是"localhost:8732/service1/postdata"(是的,包括http://只是不能在这里包含它,因为它算作一个链接,我显然只能有两个)
- (服务器端)服务器代码是我在Code Project中找到的这个解决方案的一个实现:
我尝试过的:
- 我已经使用Postman将json消息发送到上面的uri并且收到了响应(现在它只返回一个包含相同数据的包)所以我很难在uri中找到任何问题.
- 我已经使用JSONLint验证了json包.
- 我添加了各种try/catch块以获取更多错误信息,但它们都等于协议错误/错误请求错误代码400.
- 我也在脑子里砸了一些东西(这对我的室友来说更便宜,也不那么惊人)
电流输出:
我从没有数据的服务器收到错误的请求响应.
更新1:
我一定是弄错了数据转换顺序.于我之前:
- 创建了Person对象
- 将Person对象转换为json
- 将json传递给MakeRequest方法
- (在MakeRequest中)创建了将json转换为字节数组的WebRequest
MakeRequest()方法(客户端)的第一个if语句已使用代码段进行更新,该代码段以json的形式发出请求.我现在在write.Flush()执行时遇到协议违规错误:
更新了客户端代码(MakeRequest方法)
if (PostData != null && Method == HttpVerb.POST)
{
//var encoding = new UTF8Encoding();
//var bytes = ObjectToByteArray(PostData);
//request.ContentLength = bytes.Length;
//Console.WriteLine("Content length: " + request.ContentLength);
//using (var writeStream = request.GetRequestStream())
//{
// writeStream.Write(bytes, 0, bytes.Length);
//}
using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}
var httpResponse = (HttpWebResponse)request.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}
}
更新2:
streamWriter.Flush()调用中的协议违规错误是因为我没有设置request.ContentLenth.我现在已将Content.Length设置为json.Length,现在我收到此错误:
图像有点小,但错误信息显示为:
"System.ArgumentException: Stream was not readable."
我认为问题出在 try 块的第一行。我尝试从请求对象读取响应...呃...虽然我确实尝试从响应对象进一步读取响应，但损坏已经造成。我已将下面的工作代码与导致问题的注释掉的代码一起包含在内。我已经用 **** 标记了有问题的 request.GetResponse() 以及正确的 response.GetResponseStream() ，您会很高兴听到它，现在可以自由地完成其工作。
希望这可以节省很多时间！
MakeRequest 方法的所有相关部分：
var request = (HttpWebRequest)WebRequest.Create(EndPoint);
request.Method = Method.ToString();
request.ContentLength = 0;
request.ContentType = ContentType;
Console.WriteLine("request: " + request.Headers.ToString());
if (PostData != null && Method == HttpVerb.POST)
{
Console.WriteLine("json length: " + json.Length);
Console.WriteLine(json);
request.ContentLength = json.Length;
var encoding = new UTF8Encoding();
using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}
}
try
{
// **** FIRST READ USING request.GetResponse() ****
//var httpResponse = (HttpWebResponse)request.GetResponse();
//using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
//{
// streamReader.ReadToEnd();
//}
using (var response = (HttpWebResponse)request.GetResponse())
{
var responseValue = string.Empty;
if (response.StatusCode != HttpStatusCode.OK)
{
var message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);
throw new ApplicationException(message);
}
// grabs the response
using (var responseStream = response.GetResponseStream())
{
if (responseStream != null)
using (var reader = new StreamReader(responseStream))
{
// **** SECOND READ USING response.GetResponseStream() ****
responseValue = reader.ReadToEnd();
}
}
return responseValue;
}
}
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