WebAPI 在服务器上给出 404

Question

This has been asked a million times but....

I have a WebAPI. It works on my local machine running IIS. But after deploying to server, it fails.

Things I have tried:

Added

<modules runAllManagedModulesForAllRequests="true">

Set handlers to

<remove name="WebDAV" />
  <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" />

Add json as MIME type

<staticContent>
  <mimeMap fileExtension=".json" mimeType="application/json" />
</staticContent>

Routing is mapped as

// Web API routes
        config.MapHttpAttributeRoutes();

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

Startup file:

public static void ConfigureContainer(IAppBuilder app)
    {
        var builder = new ContainerBuilder();

        var options = CreateCorsOptions();
        app.UseCors(options);

        // Get your HttpConfiguration.
        config = new HttpConfiguration();

        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        WebApiConfig.Register(config);

        RegistererWebApi(builder, config);

        // Register dependencies, then...
        var container = builder.Build();
        var webApiResolver = new AutofacWebApiDependencyResolver(container);
        GlobalConfiguration.Configuration.DependencyResolver = webApiResolver;

        // Register the Autofac middleware FIRST. This also adds
        // Autofac-injected middleware registered with the container.
        app.UseAutofacMiddleware(container);
        app.UseAutofacWebApi(config);
        app.UseWebApi(config);

    }

private static void RegistererWebApi(ContainerBuilder builder, HttpConfiguration config)
    {
        // Register your Web API controllers.
        builder.RegisterApiControllers(Assembly.GetExecutingAssembly());

        // OPTIONAL: Register the Autofac filter provider.
        //builder.RegisterWebApiFilterProvider(config);
    }

UPDATE

Here is my full WebApiConfig:

public static class WebApiConfig
{
    /// <summary>
    /// Register the WebAPI. Remove Xml formatter (OPnly using JSON). Add filters. Set Routing
    /// </summary>
    /// <param name="config"></param>
    public static void Register(HttpConfiguration config)
    {
        //Enable cross origin requests
        var cors = new EnableCorsAttribute("http://local.isos.com,htt://dev.isos.mydelphic.com,http://qa.isos.mydelphic.com,http://localhost/", headers: "*", methods: "*");
        config.EnableCors(cors);

        // Web API configuration and services
        // Remove the XML formatter
        config.Formatters.Remove(config.Formatters.XmlFormatter);

        var json = config.Formatters.JsonFormatter;
        json.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        json.SerializerSettings.Formatting = Newtonsoft.Json.Formatting.Indented;

        config.Filters.Add(new UnhandledExceptionFilter());

        config.MessageHandlers.Add(new CacheCow.Server.CachingHandler(config));

        // Web API routes
        config.MapHttpAttributeRoutes();

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


    }

UPDATE2

Here is how I register my controllers with Autofac

private static void RegistererWebApi(ContainerBuilder builder, HttpConfiguration config)
    {
        // Register your Web API controllers.
        builder.RegisterApiControllers(Assembly.GetExecutingAssembly());            
    }

And here is my controller:

[RoutePrefix("providers")]
public class ProviderController : BaseApiController
{
    /// <summary>
    /// Constructor
    /// </summary>
    /// <param name="requestDispatcher">Dispatcher gets injected by Ioc</param>
    public ProviderController(IRequestDispatcher requestDispatcher)
        : base(requestDispatcher)
    { }

    /// <summary>
    /// Get a list of all providers outside the Philipines
    /// </summary>
    /// <returns>Returns an action result regarding the state of the request. Returns a 200 containing the list of providers. Returns a 404 is no results are found.</returns>
    [Route("",Name="Providers")]
    public async Task<IHttpActionResult> Get(string sort = "ProviderName", int page = 1, int pageSize = 10)
    {
        var query = new GetProviders();
        // Populate the view model by calling the appropriate handler
        var providers = await RequestDispatcher.DispatchAsync<GetProviders, ProvidersResponse>(query);
        if (providers == null)
        {
            return NotFound();
        }

        var totalCount = providers.Count;
        var totalPages = (int)Math.Ceiling((double)totalCount / pageSize);

        var urlHelper = new UrlHelper(Request);

        //Route name
        var prevLink = page > 1 ? urlHelper.Link("Providers",
        new
        {
            page = page - 1,
            pageSize = pageSize,
            sort = sort
        }) : "";

        var nextLink = page < totalPages ? urlHelper.Link("Providers",
        new
        {
            page = page + 1,
            pageSize = pageSize,
            sort = sort
        }) : "";


        var paginationHeader = new
        {
            currentPage = page,
            pageSize = pageSize,
            totalCount = totalCount,
            totalPages = totalPages,
            previousPageLink = prevLink,
            nextPageLink = nextLink
        };

        HttpContext.Current.Response.Headers.Add("X-Pagination", Newtonsoft.Json.JsonConvert.SerializeObject(paginationHeader));

        return Ok(providers);
    }
}

Answer 1

It appears you're using OWIN, not the older-style singleton GlobalConfiguration ... yet you're setting the dependency resolver on GlobalConfiguration .

One of the common errors when using OWIN is to try to set the GlobalConfiguration dependency resolver.

Try setting config.DependencyResolver instead. Check the docs for example/explanation.

Answer 2

It was a configuration setting. On the server, which is an older server, although still running IIS7, you need to explicitly tell IIS to look for an OWIN start up class:

<appSettings>  
  <add key="owin:appStartup"          vaue="yourproject.startup" />       
</appSettings>