asp.net mvc - How to define routing for simple subfolder/action case? -

i make simple asp.net mvc application (or call hhtp service) can post simple data using post method. want use following url:

www.mysite.com/api/postdata

yet havenit figured out how configure routeconfig , contoller. best attempt was, , have tried dozens others is:

public static void registerroutes(routecollection routes) {     routes.ignoreroute("{resource}.axd/{*pathinfo}");      routes.maproute(         name: "apipostdata",         url: "api/postdata",         defaults: new { controller = "api", action = "postdata" }     ); } 

my controller:

public class apicontroller : controller {     //[httppost]     public jsonresult postdata(postdata postdata)     {         // save database         retun json(true);     } } 

type postdata declared simpler object.

why not work? error 404. have tried many many variations around that. read hundreds of pages, yet not single working example. have came across called areas refuse believe coding , complications necessary such trivial task. cannot true.

edit - update:

i have prepared more trivial test case:

public static void registerroutes(routecollection routes) {     routes.ignoreroute("{resource}.axd/{*pathinfo}");      // executes, checked in debugger     routes.maproute(             name: "test",             url: "api/test",             defaults: new { controller = "api", action = "test" }     ); }   public class apicontroller : controller {      public actionresult test()     {         return content("test test test");     } } 

so, if call with

localhost/site/api/test 

i should "test test test" response. wrong !!! is

no http resource found matches request uri 'http://localhost/site/api/test'.no type found matches controller named 'test'.

what going on ????

update

i have in desperation tried direct version no "folder".

public static void registerroutes(routecollection routes) {     routes.ignoreroute("{resource}.axd/{*pathinfo}");      routes.maproute(             name: "test2",             url: "test",             defaults: new { controller = "api", action = "test" }     ); } 

and can call with

www.mysite.com/test 

and returns test test test should.

update

it seems bug. if reconfigure above maproute target

www.mysite.com/xxx/test

it works. seems if url contains string "api" breaks.

try route:

routes.maproute(     name: "apipostdata",     url: "api/{action}/{postdata}",     defaults: new { controller = "api", action = "postdata", postdata = urlparameter.optional } ); 

this match request "www.mysite.com/api/postdata/12345" example.