All ASP NET Web API controllers return 404

Question

I m trying to get an API Controller to work inside an ASP NET MVC 4 web app  However  every request results in a 404 and I m stumped      I have the standard API controller route from the project template defined like   public static class WebApiConfig       public static void Register HttpConfiguration config                config Routes MapHttpRoute              name   DefaultApi               routeTemplate   api  controller   id                defaults  new   id   RouteParameter Optional                        The registration is invoked in Global asax   protected void Application Start         AreaRegistration RegisterAllAreas            Register API routes     WebApiConfig Register GlobalConfiguration Configuration        FilterConfig RegisterGlobalFilters GlobalFilters Filters        RouteConfig RegisterRoutes RouteTable Routes       I have a basic API controller like this   namespace Website Controllers       public class FavoritesController   ApiController                         GET api  lt controller gt          public IEnumerable lt string gt  Get                         return new       first    second                           PUT api  lt controller gt  5         public void Put int id                                   DELETE api  lt controller gt  5         public void Delete int id                                 Now  when I browse to localhost 59900 api Favorites I expect the Get method to be invoked  but instead I get a 404 status code and the following response    lt Error gt      lt Message gt         No HTTP resource was found that matches the request URI  http   localhost 59900 api Favorites       lt  Message gt      lt MessageDetail gt        No type was found that matches the controller named  Favorites       lt  MessageDetail gt   lt  Error gt    Any help would be greatly appreciated  I m losing my mind a little bit over here     Thanks

User · Answer

I have solved similar problem by attaching with debugger to application init  Just start webserver  for example  access localhost   attach to w3wp and see  if app initialization finished correctly  In my case there was exception  and controllers was not registered

User · Answer

One thing I ran into was having my configurations registered in the wrong order in my GLobal asax file for instance   Right Order   AreaRegistration RegisterAllAreas    WebApiConfig Register GlobalConfiguration Configuration   FilterConfig RegisterGlobalFilters GlobalFilters Filters   RouteConfig RegisterRoutes RouteTable Routes     Wrong Order   AreaRegistration RegisterAllAreas    FilterConfig RegisterGlobalFilters GlobalFilters Filters   RouteConfig RegisterRoutes RouteTable Routes   WebApiConfig Register GlobalConfiguration Configuration     Just saying  this was my problem and changing the order is obvious  but sometimes overlooked and can cause much frustration

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I had the same 404 issue and none of the up-voted solutions here worked  In my case I have a sub application with its own web config and I had a clear tag inside the parent s httpModules web config section  In IIS all of the parent s web config settings applies to sub application    lt system web gt         lt httpModules gt       lt clear  gt     lt  httpModules gt   lt  system web gt    The solution is to remove the  clear  tag and possibly add inheritInChildApplications  false  in the parent s web config  The inheritInChildApplications is for IIS to not apply the config settings to the sub application     lt location path     inheritInChildApplications  false  gt     lt system web gt            lt system web gt   lt  location gt

User · Answer

Had essentially the same problem  solved in my case by adding    lt modules runAllManagedModulesForAllRequests  true    gt    to the    lt system webServer gt    lt  system webServer gt    section of web config

User · Answer

Had this problem  Had to uncheck Precompile during publishing

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I m a bit stumped  not sure if this was due to an HTTP output caching issue   Anyways   all of a sudden it started working properly      So  the example above worked without me adding or changing anything   Guess the code just had to sit and cook overnight        Thanks for helping  guys

User · Answer

WebApiConfig Register GlobalConfiguration Configuration     Should be first in App start event  I have tried it at last position in APP start event  but that did not work

User · Answer

Create a Route attribute for your method   example            Route  api Get            public IEnumerable lt string gt  Get                         return new string      value1    value2                 You can call like these http   localhost api Get

User · Answer

Similar problem with an embarrassingly simple solution - make sure your API methods are public   Leaving off any method access modifier will return an HTTP 404 too   Will return 404   List lt CustomerInvitation gt  GetInvitations      Will execute as expected   public List lt CustomerInvitation gt  GetInvitations

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Add this to  lt system webServer gt  in your web config    lt handlers gt       lt remove name  ExtensionlessUrlHandler-Integrated-4 0   gt       lt remove name  OPTIONSVerbHandler   gt       lt remove name  TRACEVerbHandler   gt       lt add name  ExtensionlessUrlHandler-Integrated-4 0  path      verb     type  System Web Handlers TransferRequestHandler          preCondition  integratedMode runtimeVersionv4 0   gt   lt  handlers gt    Adding  lt modules runAllManagedModulesForAllRequests  true    gt  also works but is not recommended due performance issues

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Check that if your controller class has the  RoutePrefix  somepath    attribute  that all controller methods also have a  Route    attribute set   I ve run into this issue as well and was scratching my head for some time

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For reasons that aren t clear to me I had declared all of my Methods   Actions as static - apparently if you do this it doesn t work  So just drop the static off   AllowAnonymous   Route    public static HttpResponseMessage Get         return new HttpResponseMessage System Net HttpStatusCode OK       Became -   AllowAnonymous   Route    public HttpResponseMessage Get         return new HttpResponseMessage System Net HttpStatusCode OK

User · Answer

I had this problem  My Web API 2 project on  NET 4 7 2 was working as expected  then I changed the project properties to use a Specific Page path under the Web tab  When I ran it every time since  it was giving me a 404 error - it didn t even hit the controller   Solution  I found the  vs hidden folder in my parent directory of my VS solution file  sometimes the same directory   and deleted it  When I opened my VS solution once more  cleaned it  and rebuilt it with the Rebuild option  it ran again  There was a problem with the cached files created by Visual Studio  When these were deleted  and the solution was rebuilt  the files were recreated

User · Answer

I m going to add my solution here because I personally hate the ones which edit the web config without explaining what is going on   For me it was how the default Handler Mappings are set in IIS  To check this      Open IIS Manager Click on the root node of your server  usually the name of the server  Open  Handler Mappings  Under Actions in the right pane  click  View ordered list    This is the order of handlers that process a request  If yours are like mine  the  ExtensionlessUrlHandler-   handlers are all below the StaticFile handler  Well that isn t going to work because the StaticFile handler has a wildcard of   and will return a 404 before even getting to an extensionless controller   So rearranging this and moving the  ExtensionlessUrlHandler-   above the wildcard handlers of TRACE  OPTIONS and StaticFile will then have the Extensionless handler activated first and should allow your controllers  in any website running in the system  to respond correctly   Note  This is basically what happens when you remove and add the modules in the web config but a single place to solve it for everything  And it doesn t require extra code

User · Answer

I had the same problem  then I found out that I had duplicate api controller class names in other project and despite the fact that the  routePrefix  and namespace and project name were different but still they returned 404  I changed the class names and it worked

User · Answer

If you manage the IIS and you are the one who have to create new site then check the  quot Application Pool quot  and be sure the CLR version must be selected  In my situation  it had been selected  quot No Managed Code quot   After changed to v4 0 it started to work

User · Answer

Add following line  GlobalConfiguration Configure WebApiConfig Register     in Application Start   function in Global ascx cs file

User · Answer

I have been working on a problem similar to this and it took me ages to find the problem  It is not the solution for this particular post  but hopefully adding this will save someone some time trying to find the issue when they are searching for why they might be getting a 404 error for their controller    Basically  I had spelt  Controller  wrong at the end of my class name  Simple as that

User · Answer

I have dozens of installations of my app with different clients which all worked fine and then this one just always returned 404 on all api calls   It turns out that when I created the application pool in IIS for this client it defaulted to  net framework 2 0 instead of 4 0 and I missed it   This caused the 404 error   Seems to me this should have been a 500 error   Very misleading Microsoft

[asp.net-mvc] All ASP.NET Web API controllers return 404

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