本地测试 web api 时出现 404 not found 错误

Question

This is my first time trying to use the WEB API in a project and am not having any success with it...

I keep getting 404 errors when I try and reach my api route in Fiddler.

I tried looking a lot on the web and even here at the following link, but there are so many combinations, that I'm not sure what would work.

HTTP 404 Page Not Found in Web Api hosted in IIS 7.5

If somebody can please help me with this to get the right settings I would really appreciate it.

Here is my code: Web.config file:

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=301879
  -->
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <section name="FuelTicketImageRetrievalSvc.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </sectionGroup>
  </configSections>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
    <add key="AssignedGroup" value="FMS Maintenance Level 3" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5.1" />
    <httpRuntime targetFramework="4.5.1" />
  </system.web>
  <system.webServer>
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
  </system.webServer>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-5.1.0.0" newVersion="5.1.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
  <system.serviceModel>
    <bindings />
    <client />
  </system.serviceModel>
  <applicationSettings>
    <FuelTicketImageRetrievalSvc.Properties.Settings>
      <setting name="FuelTicketImageRetrievalSvc_IncidentService_HPD_IncidentInterface_Create_WSService" serializeAs="String">
        <value>http://miavsbremweb/arsys/services/ARService?server=miavsbremapp.ryder.com&amp;webService=HPD_IncidentInterface_Create_WS</value>
      </setting>
    </FuelTicketImageRetrievalSvc.Properties.Settings>
  </applicationSettings>
</configuration>

WebApiConfig.cs file:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Http;

namespace FuelTicketImageRetrievalSvc
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API configuration and services

            // Web API routes
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }
    }
}

Global.asax.cs file:

using FuelTicketImageRetrieval;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace FuelTicketImageRetrievalSvc
{
    public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            GlobalConfiguration.Configure(WebApiConfig.Register);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
    }
}

Controller method that I'm trying to call. It's just a dummy method that simply returns null with no parameters. It's name is FuelTicketImageRetrievalController:

public string GetSpecificFuelTicket()
        {
            try
            {
                return null;
            }
            catch (Exception ex)
            {
                return null;
            }
        }

The name of my project is called FuelTicketImageRetrievalSvc . I have verified through the web settings in the project that IIS Express is being used and is set to

http://localhost:11581/

url path call.

http://localhost:11581/FuelTicketImageRetrievalSvc/api/GetSpecificFuelTicket

Answer 1

您不需要在 uri 中使用FuelTicketImageRetrievalSvc ，它应该可以简单地与/api/...这就是您的路由匹配的内容，在那里使用 svc 名称会导致它不匹配。

Answer 2

You need to add your controller in the path and remove your project

http://localhost:11581/api/FuelTicketImageRetrieval/GetSpecificFuelTicket

You remove the Controller part when referencing it - the /FuelTicketImageRetrieval/ is from the FuelTicketImageRetrievalController not the project. Web API will auto add the controller back on the name when looking for the correct class.

Answer 3

For a quick guaranteed run (and sometimes preferred approach), add HTTP action prefix and route attributes before your method:

    [HttpGet]
    [Route("api/Products/SpecificFuelTicket")]
    public string GetSpecificFuelTicket()
    {
        try
        {
            return null;
        }
        catch (Exception ex)
        {
            return null;
        }
    }

Now, you can access it using URL:

http://localhost:xxxx/api/products/SpecificFuelTicket

Points to note:

1. HTTPGet ensures that only Get action is mapped to this method
2. Route value ensures a direct mapping to a URL. As REST standard, "Get", "Delete" etc.. are not used as prefix in URL. The HTTP action is used for that.
3. Some methods are automatically mapped to suitable URLs, but since your class name is "FuelTicketImageRetrievalController" and method name is "GetSpecificFuelTicket", it is not trivial.
4. Returning null is not an issue. it is returned serialized as "null".

For your another question to Charles, if you want to use URL "localhost:xxxx/api/GetSpecificFuelTicketAsync/6460194", and your method signature takes int, you can change the route prefix as following (again, not using "Get" in the route):

    [HttpGet]
    [Route("api/Products/SpecificFuelTicket/{value}")]
    public string GetSpecificFuelTicket(int value)
    {
        try
        {
            return "Your ticket is " + value.ToString();
        }
        catch (Exception ex)
        {
            return null;
        }
    }

However, as Charles suggested, using " api/Products/SpecificFuelTicket?value=6460194 " format is perhaps better. Any parameter name in the method is automatically mapped to similar name query parameter. So, your method'd look like:

[HttpGet]
[Route("api/Products/SpecificFuelTicket")]
public string GetSpecificFuelTicket(int value)
{
   ....
}

For, a detailed understanding of URL mapping and routing web-API, refer to link:

1. Attribute Routing in Web API 2
2. Routing and Action Selection

Answer 4

I originally had a 404 error when I added WebApi support to my Mvc solution.

My global.asax.cs contained the lines:

        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
        GlobalConfiguration.Configure(WebApiConfig.Register);

What I found is that when I changed he WebApiConfig line, so that the code block became:

        AreaRegistration.RegisterAllAreas();
        GlobalConfiguration.Configure(WebApiConfig.Register);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);

it fixed my problem