asp.net mvc 4 - WebAPI AttributeRouting with version number as parameter -

i trying set route mvc controller action following template:

[route("app/{appid:length(20)}/validate/{version}")] 

the idea resulting url this: (i'm adding space make localhost url try not resolve...)

http:/ /localhost:2642/api/update/v1/app/6a6ee0b355c34dbfb381/validate/1.0.0.0

the problem have give me 404 error.

if remove route attribute , use built-in mvc routing, works. url is:

http:/ /localhost:2642/api/external/checkforupdate?appid=6a6ee0b355c34dbfb381&version=1.0.0.0

this should work since know nuget has got versions in url's, think use built-in mvc router.

i tried add :regex() markup in template route validate string format, didn't work. if pass in normal string or value such 1_0_0_0 works. thing don't want go through effort manipulate version string before sending api , in api itself.

any ideas on doing wrong?

if make routing attribute

[route("app/{appid:length(20)}/validate/{version:regex(^([1-9]\\d+|[0-7])(\\.\\d{1,3}){0,3}$)}")] 

and make sure accept parameters in method

public task<ihttpactionresult> get(string appid, string version) {     //magic } 

then in web.config, system.webserver > handlers section change *. *

<add name="extensionlessurlhandler-integrated-4.0" path="*." verb="*" type="system.web.handlers.transferrequesthandler" precondition="integratedmode,runtimeversionv4.0" /> 

to

<add name="extensionlessurlhandler-integrated-4.0" path="*" verb="*" type="system.web.handlers.transferrequesthandler" precondition="integratedmode,runtimeversionv4.0" /> 

and make sure

<modules runallmanagedmodulesforallrequests="true"> 

exists in <system.webserver>