自定义“找不到与请求URI相匹配的http资源”消息

Question

是否有简单的方法来修改Web API返回的默认404消息？

没有HTTP资源发现，请求URI

Answer 1

你需要重写DelegatingHandler抽象类相匹配。

多看这里Uniform, consistent error responses from ASP.Net Web API 2

这里，ASP.NET Web API Exception Handling

Answer 2

简单的方式做到这一点是 “DelegatingHandler”

1. 第一步是创建一个新的类从DelegatingHandler继承：

   public class ApiGatewayHandler : DelegatingHandler 
       { 
        protected async override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) 
        { 
        var response = await base.SendAsync(request, cancellationToken); 
   
        if (response!=null && response.StatusCode == HttpStatusCode.NotFound) 
        { 
         var msg = await response.Content.ReadAsStringAsync(); 
   
         //you can change the response here 
         if (msg != null && msg.Contains("No HTTP resource was found")) 
         { 
          return new HttpResponseMessage 
          { 
           StatusCode = HttpStatusCode.NotFound, 
           Content = new ObjectContent(typeof(object), new { Message = "New Message..No HTTP resource was found that matches the request URI" }, new JsonMediaTypeFormatter()) 
          }; 
         } 
        } 
        return response; 
   
       return response; 
   } 
   

   }

2. 然后在网页API注册的配置文件

   public static void Register(HttpConfiguration config){ 
       public static void Register(HttpConfiguration config) 
       { 
        // you config and routes here     
   
        config.MessageHandlers.Add(new ApiGatewayHandler()); 
   
        //.... 
       } 
   } 
   

这就是它注册这个类。同样的方法，如果你需要改变任何其他错误信息。