The Request is Invalid Error from ASP.NET Web API

Introduction 

 

This post explains the 'The Request is Invalid' error from the ASP.NET Web API.

  

 

 

Error Reason:

• Forgot to define routing.
• Same method name.

Solved this error using Routing on the method level.

      [HttpGet]
      public List<string> GetAllString()
      {
          return new List<string> {"ABC","XYZ" };
      }

      [HttpGet]
      [Route("NumberList")]
      public List<int> GetAllNumbers()
      {
          return new List<int> { 122, 555 };
      }

      [HttpGet]
      [Route("api/numberapi/NumberList")]
      public List<int> GetAllEvenNumber()
      {
          return new List<int> { 22, 44,66 };
      }

Problem Solved

 

http://localhost:50297/numberlist

 

 

http://localhost:50297/api/numberapi/numberlist

 

 

NOTE

 

Some times the above solution will not fit or suit as per your current scenario. Please go through the following external links for solutions.

 

Other Links:

• asp-net-webapi-newly-registered-route-says-that-request-is-invalid
• overload-web-api-action-method-based-on-parameter-type 
• webapi-angularjs-the-request-is-invalid-error
• web-api-request-invalid