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copied!<p>Your exception was actually complaining about their being a conflict between these two methods on the <code>Profile</code> controller:</p> <ul> <li>sendpaycheck(string)</li> <li>sendmail(string)</li> </ul> <p>Not the Get and Get(?); although this would also be an issue. </p> <p>Really, when carrying out RPC actions that make changes or trigger actions you should use the POST verb. By doing this your routing issues mentioned above should be resolved.</p> <p><strong>Updated</strong></p> <p>Have you considered a more resource centric approach to your problem? In all cases here the resource is "Profile" and it appears to have a unique id of x. It appears to also have two other possible unique id's email and ssn?</p> <p>If these were acceptable URL's to you</p> <pre><code>http://localhost/api/profile http://localhost/api/profile/x http://localhost/api/profile/?email=myemail@x.com http://localhost/api/profile/?ssn=x </code></pre> <p>you could use:</p> <pre><code>public class ProfileController : ApiController { public string Get(int id) { return string.Format("http://localhost/api/profile/{0}", id); } public string Get([FromUri] string email = null, [FromUri] int? ssn = null) { if (!string.IsNullOrEmpty(email)) { return string.Format("http://localhost/api/profile/?email={0}", email); } if (ssn.HasValue) { return string.Format("http://localhost/api/profile/?ssn={0}", ssn.Value); } return "http://localhost/api/profile"; } } </code></pre> <p>With just the standard webapi routing:</p> <pre><code> config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } </code></pre> <p><strong>But</strong></p> <p>If you did want to carry on with /email and /ssn you may have issues with the email... specifically with the "." in the email address and this can confuse the routing engine... for this to work you must put a trailing slash i.e. <code>http://localhost/api/profile/email/me@me.com/</code> I think you will find <code>http://localhost/api/profile/email/me@me.com</code> wont work. </p> <p>This supports:</p> <pre><code>http://localhost/api/profile http://localhost/api/profile/x http://localhost/api/profile/email/myemail@x.com/ http://localhost/api/profile/ssn/x </code></pre> <p>I would try this and use (NB. the use of the name <strong>rpcId</strong> to differentiate the routes):</p> <pre><code>public class ProfileController : ApiController { public string Get(int id) { return string.Format("http://localhost/api/profile/{0}", id); } public string Get() { return "http://localhost/api/profile"; } [HttpGet] public string Ssn(int rpcId) { return string.Format("http://localhost/api/profile/ssn/{0}", rpcId); } [HttpGet] public string Email(string rpcId) { return string.Format("http://localhost/api/profile/email/{0}", rpcId); } } </code></pre> <p>My routing would then be:</p> <pre><code> config.Routes.MapHttpRoute( name: "ProfileRestApi", routeTemplate: "api/profile/{id}", defaults: new { id = RouteParameter.Optional, Controller = "Profile" } ); config.Routes.MapHttpRoute( name: "PrfileRpcApi", routeTemplate: "api/profile/{action}/{rpcId}", defaults: new { Controller = "Profile" } ); </code></pre>

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