System.Net.WebException在使用POST请求向Jira API发送JSON时
好吧，我一直在解决这个问题一天左右，没有明确的解决方案。 我将从例外开始：
The remote server returned an error: NotFound.
at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
我正在尝试连接到JIRA rest API以登录用户。 我们的JIRA系统目前正在运行4.4.1，我试图打的API信息记录在这里：https：//developer.atlassian.com/static/rest/jira/4.4.1.html。 （请参阅“/ auth / 1 / session”API的POST请求）
API调用POST请求，并为用户凭证提供JSON主体。 我已经尝试了手动构建JSON以及使用JSON库，结果是相同的。 我发送的json是：
{
"username": "test",
"password": "test"
}
我试图将内容类型和编码更改为我能想象的任何内容。 这包括“text / json”，“application / json”，将Encoding.UTF8添加到流编写器等。所有结果都是相同的。
也许这整个考验中最令人沮丧的部分是，我能够立即在Java中为Android写这篇文章，所以我不认为这是API的误解，就像Windows Phone 8和/或C＃误解。
最后要指出的一些事情是：
以下是我目前拥有的代码。 我已经取出了我的Jira主机名
class LoginService
{
public static UserSession login(string aUsername, string aPassword)
{
String loginUrl = "http://{myjiraurl}/rest/auth/1/session/";
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(loginUrl);
string jsonBody = JsonHelper.GenerateLoginJson(aUsername, aPassword);
RequestInformation requestInfo = new RequestInformation();
requestInfo.request = request;
requestInfo.JsonBody = jsonBody;
requestInfo.request.Method = "POST";
requestInfo.request.ContentType = "text/json";
requestInfo.request.ContentLength = (long)jsonBody.Length;
request.BeginGetRequestStream(new AsyncCallback(LoginRequestCallback), requestInfo);
return null;
}
private static void LoginRequestCallback(IAsyncResult result)
{
RequestInformation requestInfo = (RequestInformation)result.AsyncState;
HttpWebRequest webRequest = requestInfo.request;
// End the Asynchronus request.
Stream requestSream = webRequest.EndGetRequestStream(result);
StreamWriter requestWriter = new StreamWriter(requestSream);
requestWriter.Write(requestInfo.JsonBody);
requestWriter.Flush();
requestWriter.Close();
requestSream.Close();
webRequest.BeginGetResponse(new AsyncCallback(LoginResponseCallback), requestInfo);
}
private static void LoginResponseCallback(IAsyncResult result)
{
RequestInformation requestInfo = (RequestInformation)result.AsyncState;
HttpWebRequest webRequest = requestInfo.request;
try
{
HttpWebResponse response = (HttpWebResponse)webRequest.EndGetResponse(result);
if (response.StatusCode == HttpStatusCode.OK)
{
Stream streamResponse = response.GetResponseStream();
string responseResult = StreamHelper.ReadStreamToString(streamResponse);
streamResponse.Close();
}
response.Close();
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(e.Message);
System.Diagnostics.Debug.WriteLine(e.StackTrace);
}
}
}
public class RequestInformation
{
// This class stores the request state of the request and any necessary information for the request body
public HttpWebRequest request;
public string JsonBody { get; set; }
public string Result { get; set; }
public RequestInformation()
{
request = null;
}
}
编辑：对于一些澄清，试图在这一行上生成响应对象时代码失败...
HttpWebResponse response = (HttpWebResponse)webRequest.EndGetResponse(result);
更新1：
我发现我可以将WebException的响应转换为HttpWebResponse 。 这使我可以看到确切的状态码是什么，它是HttpStatusCode.UnsupportedMediaType或415.这现在直接指出了发送到服务器的JSON编码的问题。
你们会认为我是疯子，但是直到下午3点左右，我已经得到了预期的结果。
一旦我重构了一点，我将用更新的代码编辑这个答案。
更新的工作代码：
public static async Task<HttpWebResponse> SendHttpPostRequest(string url, string content, string contentType, string acceptType)
{
HttpWebRequest request = HttpWebRequest.CreateHttp(new Uri(url, UriKind.Absolute));
HttpWebResponse response = new HttpWebResponse();
string responseText = "";
request.Method = "POST";
request.ContentType = contentType;
request.Accept = acceptType;
Task<Stream> requestTask = Task.Factory.FromAsync(request.BeginGetRequestStream, asyncResult => request.EndGetRequestStream(asyncResult), (object)null);
await requestTask.ContinueWith(t =>
{
using (Stream stream = requestTask.Result)
using (StreamWriter requestWriter = new StreamWriter(stream))
{
requestWriter.Write(content);
}
});
Task<WebResponse> responseTask = Task.Factory.FromAsync(request.BeginGetResponse, asyncResult => request.EndGetResponse(asyncResult), (object)null);
await responseTask.ContinueWith(t =>
{
try
{
response = (HttpWebResponse)responseTask.Result;
}
catch (AggregateException ae)
{
foreach (Exception e in ae.InnerExceptions)
{
if (e is WebException)
{
response = (HttpWebResponse)((WebException)e).Response;
System.Diagnostics.Debug.WriteLine(e.Message);
System.Diagnostics.Debug.WriteLine(e.StackTrace);
}
}
}
});
return response;
}
}
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