ASP NET Web Api The requested resource does not support http method GET

Question

I ve got the following action on an ApiController   public string Something         return  value       And I ve configured my routes as follows   routes MapHttpRoute      name   DefaultApi       routeTemplate   api  controller   action   id        defaults  new   id   RouteParameter Optional        In the beta  this worked just fine  but I just updated to the latest Release Candidate and now I m seeing errors on calls like this      The requested resource does not support http method  GET     Why doesn t this work anymore    I suppose I could get rid of  action  and just make a ton of controllers  but that feels messy

User · Answer

Have the same Setup as OP  One controller with many actions    less  messy   -   In my case i forgot the   HttpGet   when adding a new action    HttpGet  public IEnumerable lt string gt  TestApiCall         return new string      aa    bb

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I got this error when running a query without SSL  Simply changing the URL scheme of my request from HTTP to HTTPS fixed it

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My issue was as simple as having a null reference that didn t show up in the returned message  I had to debug my API to see it

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All above information is correct  I d also like to point out that the  AcceptVerbs    annotation exists in both the System Web Mvc and System Web Http namespaces    You want to use the System Web Http if it s a Web API controller

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I don t know if this can be related to the OP s post but I was missing the  HttpGet  annotation and that was what was causing the error  as stated by  dinesh ravva methods are assumed to be HttpPost by default

User · Answer

Although this isn t an answer to the OP  I had the exact same error from a completely different root cause  so in case this helps anybody else     The problem for me was an incorrectly named method parameter which caused WebAPI to route the request unexpectedly  I have the following methods in my ProgrammesController    HttpGet  public Programme GetProgrammeById int id                HttpDelete  public bool DeleteProgramme int programmeId                DELETE requests to     api programmes 3 were not getting routed to DeleteProgramme as I expected  but to GetProgrammeById  because DeleteProgramme didn t have a parameter name of id  GetProgrammeById was then of course rejecting the DELETE as it is marked as only accepting GETs   So the fix was simple    HttpDelete  public bool DeleteProgramme int id                And all is well  Silly mistake really but hard to debug

User · Answer

If you are decorating your method with HttpGet  add the following using at the top of the controller   using System Web Http    If you are using System Web Mvc  then this problem can occur

User · Answer

This is certainly a change from Beta to RC   In the example provided in the question  you now need to decorate your action with  HttpGet  or  AcceptVerbs  GET        This causes a problem if you want to mix verb based actions  i e   GetSomething    PostSomething   with non verb based actions  If you try to use the attributes above  it will cause a conflict with any verb based action in your controller   One way to get arount that would be to define separate routes for each verb  and set the default action to the name of the verb   This approach can be used for defining child resources in your API   For example  the following code supports    resource id children  where id and children are optional           context Routes MapHttpRoute             name   Api Get              routeTemplate    controller   id   action               defaults  new   id   RouteParameter Optional  action    Get                constraints  new   httpMethod   new HttpMethodConstraint  GET                         context Routes MapHttpRoute             name   Api Post              routeTemplate    controller   id   action               defaults  new   id   RouteParameter Optional  action    Post                constraints  new   httpMethod   new HttpMethodConstraint  POST                  Hopefully future versions of Web API will have better support for this scenario   There is currently an issue logged on the aspnetwebstack codeplex project   http   aspnetwebstack codeplex com workitem 184   If this is something you would like to see  please vote on the issue

User · Answer

Same problem as above  but vastly different root  For me  it was that I was hitting an endpoint with an https rewrite rule  Hitting it on http caused the error  worked as expected with https

User · Answer

Replace the following code in this path  Path    App Start    WebApiConfig cs  Code    config Routes MapHttpRoute              name   DefaultApi               routeTemplate   api  controller   action   id   Param                defaults  new   id   RouteParameter Optional                              Param   RouteParameter Optional

User · Answer

If you have not configured any HttpMethod on your action in controller  it is assumed to be only HttpPost in RC  In Beta  it is assumed to support all methods - GET  PUT  POST and Delete  This is a small change from beta to RC  You could easily decore more than one httpmethod on your action with  AcceptVerbs  GET    POST

[asp.net] ASP.NET Web Api: The requested resource does not support http method 'GET'

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