examples of idioms Web API versioning using a custom header

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In this video we will discuss versioning a Web API Service using a custom version header.

In our previous video, we have implemented a CustomControllerSelector. At the moment, this CustomControllerSelector is retrieving the version number for a query string parameter.

To implement versioning using a custom version header, all we have to do is change the logic slightly int the CustomControllerSelector class to read the version number from the custom version header instead of from a query string parameter

The changes that are required are commented, so it is self-explanatory.

namespace WebAPI.Custom
{ public class CustomControllerSelector : DefaultHttpControllerSelector { private HttpConfiguration _config; public CustomControllerSelector(HttpConfiguration config) : base(config) { _config = config; } public override HttpControllerDescriptor SelectController(HttpRequestMessage request) { var controllers = GetControllerMapping(); var routeData = request.GetRouteData(); var controllerName = routeData.Values["controller"].ToString(); // Default the version number to 1 string versionNumber = "1"; // Comment the code that gets the version number from Query String // var versionQueryString = HttpUtility.ParseQueryString(request.RequestUri.Query); // if (versionQueryString["v"] != null) // { // versionNumber = versionQueryString["v"]; // } // Get the version number from Custom version header // This custom header can have any name. We have to use this // same header to specify the version when issuing a request string customHeader = "X-StudentService-Version"; if (request.Headers.Contains(customHeader)) { versionNumber = request.Headers.GetValues(customHeader).FirstOrDefault(); } HttpControllerDescriptor controllerDescriptor; if (versionNumber == "1") { controllerName = string.Concat(controllerName, "V1"); } else { controllerName = string.Concat(controllerName, "V2"); } if (controllers.TryGetValue(controllerName, out controllerDescriptor)) { return controllerDescriptor; } return null; } }
}

At this point, build the solution and issue a request to /api/students using Fiddler. Notice we have not specified our custom version header in the request. We get back StudentV1 objects, this is because we have set version 1 as the default in our code.

Let's issue another request using by setting custom version header to 2

Response from the service. Since we have specified the version as 2, we got StudentV2 objects back.

examples of idioms Web API versioning using a custom header
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Science & Technology	Upload TimePublished on 1 Mar 2017

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