的X HTTP的方法，覆盖给予NOTFOUND（404）上的ASP.NET Web API [英] X-HTTP-Method-Override gives NotFound (404) on ASP.NET Web API
问题描述
我想实现以下<描述的步骤A HREF HTTP方法覆盖=http://www.asp.net/web-api/overview/working-with-http/http-message-handlers相对= nofollow的>此处。基本上，我创建一个DelegatingHandler，类似以下内容，将其添加为消息处理程序上的Application_Start 。
公共类MethodOverrideHandler：DelegatingHandler
{
只读的String [] = _methods {删除，HEAD，PUT};
常量字符串_header =X-HTTP-方法-覆盖; 保护覆盖任务＆LT; Htt的presponseMessage＆GT; SendAsync（
HTT prequestMessage请求的CancellationToken的CancellationToken）
{
//检查HTTP POST与X-HTTP-方法，覆盖头部。
如果（request.Method == HttpMethod.Post＆放大器;＆安培; request.Headers.Contains（_header））
{
//检查头值是在我们的方法列表。
VaR方法= request.Headers.GetValues（_header）.FirstOrDefault（）;
如果（_methods.Contains（方法，StringComparer.InvariantCultureIgnoreCase））
{
//改变请求方法。
request.Method =新列举HTTPMethod（法）;
}
}
返回base.SendAsync（请求的CancellationToken）;
}
}
我有我的控制器定义了以下方法：
-
人/ {ID}，GET -
人/ {ID}，PUT -
人/ {ID}，删除
我可以叫他们通过自己的本土的方法和他们的工作预期。然而，当我试着打电话给他们通过POST，用删除或PUT发送 X-HTTP-方法，覆盖头，它给出了一个未找到（404）错误。补充一点，当它给这个错误，它从来没有达到这一点很重要的 MethodOverrideHandler - 我已经把断点是从不打;它命中断点，当我打电话正常DELETE和PUT。
我甚至尝试添加另一种方法：
-
人/ {ID}，POST
当我这样做，我得到的不允许的方法（405）代替。
我以为消息处理程序进行路由和控制调度员之前运行。这是为什么给我404？
我不认为这是相关的，但我不使用默认的Web API路由。相反，我使用的是自定义属性，分配给每个方法映射，如：
routes.MapHttpRoute（
的String.Format（{0} _ {1}，operation.Name，service.ServiceId）
的String.Format（{0} / {1}，service.Route preFIX，routeTemplateAttribute.Template）
默认值，
新{列举HTTPMethod = GetHttpMethodConstraint（操作）}）;
[HttpDelete，RouteTemplate（人/（编号））
公众的Htt presponseMessage deletePerson的（字符串ID）
{
// ...
}
修改： GetHttpMethodConstraint code是低于
私有静态HttpMethodConstraint GetHttpMethodConstraint（MethodInfo的MethodInfo的）
{
VAR methodResolver = HttpMethodResolver.FromMethodInfo（MethodInfo的）;
返回新HttpMethodConstraint（methodResolver.Resolve（））;
}
内部类HttpMethodResolver
{
私人MethodInfo的_MethodInfo; 私人HttpMethodResolver（MethodInfo的MethodInfo的）
{
_MethodInfo = MethodInfo的;
} 公共静态HttpMethodResolver FromMethodInfo（MethodInfo的MethodInfo的）
{
返回新HttpMethodResolver（MethodInfo的）;
} 公共字符串[]解决（）
{
VAR动词=新的List＆LT;＆列举HTTPMethod GT;（）; 如果（MethodHasAttribute＆LT; HttpGetAttribute＆GT;（））
{
verbs.Add（HttpMethod.Get）;
}
否则，如果（MethodHasAttribute＆LT; HttpPostAttribute＆GT;（））
{
verbs.Add（HttpMethod.Post）;
}
否则，如果（MethodHasAttribute＆LT; HttpDeleteAttribute＆GT;（））
{
verbs.Add（HttpMethod.Delete）;
}
否则，如果（MethodHasAttribute＆LT; HttpPutAttribute＆GT;（））
{
verbs.Add（HttpMethod.Put）;
}
其他
{
抛出新ServiceModelException（HTTP方法属性应使用）;
} 返回verbs.Select（V =＆GT; v.Method）.ToArray（）;
} 私人布尔MethodHasAttribute＆LT; T＆GT;（）其中T：属性
{
返回GetMethodAttribute＆LT; T＆GT;（）！= NULL;
} 私人ŧGetMethodAttribute＆LT; T＆GT;（）其中T：属性
{
返回_methodInfo.GetCustomAttributes（typeof运算（T），真）.FirstOrDefault（）为T;
}
}
我试图重现你的错误，但我不能。在这里，你可以下载我简单的项目，消息处理程序： HTTPS：//dl.dropbox。 COM / U / 20568014 / WebApplication6.zip
我想指出的是执行的操作选择逻辑之前运行的消息处理程序。所以，你的情况，可能是别的东西，因为出现问题导致的问题，我想你应该看看你的其他消息处理，消息处理程序的注册code等原因在于消息处理程序永远不会运行的事实。
另外，我觉得你的 IRouteConstraint 实施 GetHttpMethodConstraint ，看起来可疑我。
下面是我的注册code的消息处理程序：
保护无效的Application_Start（对象发件人，EventArgs的发送）{ 无功配置= GlobalConfiguration.Configuration;
config.Routes.MapHttpRoute（
DefaultHttpRoute
API / {}控制器/（编号），
新{ID = RouteParameter.Optional}
）; config.MessageHandlers.Add（新MethodOverrideHandler（））;
}
I am trying to implement HTTP method override following the steps described here. Basically, I am creating a DelegatingHandler, similar to the following, and adding it as a message handler on Application_Start.
public class MethodOverrideHandler : DelegatingHandler
{
readonly string[] _methods = { "DELETE", "HEAD", "PUT" };
const string _header = "X-HTTP-Method-Override";
protected override Task<HttpResponseMessage> SendAsync(
HttpRequestMessage request, CancellationToken cancellationToken)
{
// Check for HTTP POST with the X-HTTP-Method-Override header.
if (request.Method == HttpMethod.Post && request.Headers.Contains(_header))
{
// Check if the header value is in our methods list.
var method = request.Headers.GetValues(_header).FirstOrDefault();
if (_methods.Contains(method, StringComparer.InvariantCultureIgnoreCase))
{
// Change the request method.
request.Method = new HttpMethod(method);
}
}
return base.SendAsync(request, cancellationToken);
}
}
I have the following methods defined on my Controller:
persons/{id}, GETpersons/{id}, PUTpersons/{id}, DELETE
I can call them through their "native" methods and they work as expected. However, when I try to call them through a POST, sending the X-HTTP-Method-Override header with "DELETE" or "PUT", it gives a Not Found (404) error. It is important to add that, when it gives this error, it never reaches the MethodOverrideHandler -- I have put a Breakpoint which is never hit; it does hit the Breakpoint when I call normal DELETE and PUT.
I even tried adding another method:
persons/{id}, POST
When I do this, I get a Method Not Allowed (405) instead.
I thought that message handlers were run BEFORE the Routing and Controller dispatchers. Why is this giving me 404?
I do not think this is related, but I am not using default Web API routing. Instead, I am mapping using a custom Attribute, assigned to each method, like this:
routes.MapHttpRoute(
String.Format("{0}_{1}", operation.Name, service.ServiceId),
String.Format("{0}/{1}", service.RoutePrefix, routeTemplateAttribute.Template),
defaults,
new { httpMethod = GetHttpMethodConstraint(operation) });
[HttpDelete, RouteTemplate("persons/{id}")]
public HttpResponseMessage DeletePerson(string id)
{
// ...
}
EDIT: GetHttpMethodConstraint code is below.
private static HttpMethodConstraint GetHttpMethodConstraint(MethodInfo methodInfo)
{
var methodResolver = HttpMethodResolver.FromMethodInfo(methodInfo);
return new HttpMethodConstraint(methodResolver.Resolve());
}
internal class HttpMethodResolver
{
private MethodInfo _methodInfo;
private HttpMethodResolver(MethodInfo methodInfo)
{
_methodInfo = methodInfo;
}
public static HttpMethodResolver FromMethodInfo(MethodInfo methodInfo)
{
return new HttpMethodResolver(methodInfo);
}
public string[] Resolve()
{
var verbs = new List<HttpMethod>();
if (MethodHasAttribute<HttpGetAttribute>())
{
verbs.Add(HttpMethod.Get);
}
else if (MethodHasAttribute<HttpPostAttribute>())
{
verbs.Add(HttpMethod.Post);
}
else if (MethodHasAttribute<HttpDeleteAttribute>())
{
verbs.Add(HttpMethod.Delete);
}
else if (MethodHasAttribute<HttpPutAttribute>())
{
verbs.Add(HttpMethod.Put);
}
else
{
throw new ServiceModelException("HTTP method attribute should be used");
}
return verbs.Select(v => v.Method).ToArray();
}
private bool MethodHasAttribute<T>() where T : Attribute
{
return GetMethodAttribute<T>() != null;
}
private T GetMethodAttribute<T>() where T : Attribute
{
return _methodInfo.GetCustomAttributes(typeof(T), true).FirstOrDefault() as T;
}
}
I have tried to reproduce your error but I wasn't able to. Here, you can download my simple project with your message handler: https://dl.dropbox.com/u/20568014/WebApplication6.zip
I would like to point out that message handlers run before the action selection logic is performed. So, in your case, probably something else causes the problem and I think you should look at your other message handlers, your message handler's registration code, etc because the problem occurs due to the fact that your message handler never runs.
Also, I think your IRouteConstraint implementation, GetHttpMethodConstraint, looks suspicious to me.
Here is my registration code for the message handler:
protected void Application_Start(object sender, EventArgs e) {
var config = GlobalConfiguration.Configuration;
config.Routes.MapHttpRoute(
"DefaultHttpRoute",
"api/{controller}/{id}",
new { id = RouteParameter.Optional }
);
config.MessageHandlers.Add(new MethodOverrideHandler());
}
这篇关于的X HTTP的方法，覆盖给予NOTFOUND（404）上的ASP.NET Web API的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
