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    <p>I am unable to reproduce the problem. This should work. Here's my setup:</p> <ol> <li>Create a new .NET 4.0 Console Application</li> <li>Switch to .NET Framework 4.0 profile</li> <li>Install the <code>Microsoft.AspNet.WebApi.SelfHost</code> NuGet</li> <li><p>Define a <code>Product</code></p> <pre><code>public class Product { public int Id { get; set; } public string Name { get; set; } } </code></pre></li> <li><p>A corresponding API Controller:</p> <pre><code>public class ProductsController : ApiController { public Product Get(int id) { return new Product { Id = id, Name = "prd " + id }; } } </code></pre></li> <li><p>And a host:</p> <pre><code>class Program { static void Main(string[] args) { var config = new HttpSelfHostConfiguration("http://localhost:8080"); config.Routes.MapHttpRoute( name: "DefaultApiRoute", routeTemplate: "{controller}/{id}.{format}", defaults: new { id = RouteParameter.Optional, format = RouteParameter.Optional }, constraints: null ); using (var server = new HttpSelfHostServer(config)) { server.OpenAsync().Wait(); Console.WriteLine("Press Enter to quit."); Console.ReadLine(); } } } </code></pre></li> </ol> <p>Now when you run this console application you could navigate to <code>http://localhost:8080/products/123.xml</code>. But of course you could navigate to <code>http://localhost:8080/products/123.json</code> and you will still get XML. So the question is: How to enable content negotiation using a route parameter?</p> <p>You could do the following:</p> <pre><code> class Program { static void Main(string[] args) { var config = new HttpSelfHostConfiguration("http://localhost:8080"); config.Formatters.XmlFormatter.AddUriPathExtensionMapping("xml", "text/html"); config.Formatters.JsonFormatter.AddUriPathExtensionMapping("json", "application/json"); config.Routes.MapHttpRoute( name: "DefaultApiRoute", routeTemplate: "{controller}/{id}.{ext}", defaults: new { id = RouteParameter.Optional, formatter = RouteParameter.Optional }, constraints: null ); using (var server = new HttpSelfHostServer(config)) { server.OpenAsync().Wait(); Console.WriteLine("Press Enter to quit."); Console.ReadLine(); } } } </code></pre> <p>and now you can use the following urls:</p> <pre><code>http://localhost:8080/products/123.xml http://localhost:8080/products/123.json </code></pre> <p>Now you might be wondering what's the relation between the <code>{ext}</code> route parameter that we used in our route definition and the <code>AddUriPathExtensionMapping</code> method because nowhere we did not specify it. Well, guess what: it's hardcoded in the <code>UriPathExtensionMapping</code> class to <code>ext</code> and you cannot modify it because it is readonly:</p> <pre><code>public class UriPathExtensionMapping { public static readonly string UriPathExtensionKey; static UriPathExtensionMapping() { UriPathExtensionKey = "ext"; } ... } </code></pre> <p>All this to answer your question:</p> <blockquote> <p>Can periods be used in Asp.Net Web Api Routes?</p> </blockquote> <p>Yes.</p>
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    1. USDarin Dimitrov
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    1. COYour answer is specifically correct, but I forgot to mention that "id" and "format" are strings. I will update the question, but can I accept your answer and then add another informational answer of my own?
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