We also add WithExposedHeaders, and here is where we add our custom header. From there we call AllowAnyOrigin on our CorsPolicyBuilder, which for the purposes of this demo will allow any origin to access our API. Next, we call AddCors, creating a new policy using our variable declared previously. WithExposedHeaders("x-my-custom-header") įirstly, we define a string variable called m圜orsPolicy. Let’s start by enabling CORS in our Web API, in Program.cs: var m圜orsPolicy = "M圜orsPolicy"
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We want to ensure the CORS policies don’t block our custom header, so let’s take a look at how to enable it. What if we have an application from a different URI that uses our API? Enabling Custom Header with CORS Configured Once again, we will use Postman to send a GET request to We can now find our custom header, x-my-custom-header with a value of middleware response in the Headers section of the response. Within this anonymous method, we add our custom header to the current response.įinally, we need to ensure we call await next() so that the next Task in the pipeline executes. We can add a custom header to the ASP.NET Core middleware in Program.cs: app.Use(async (context, next) =>Ĭ("x-my-custom-header", "middleware response") įirstly, we use the IApplicationBuilder interface and call the Use method. We then define an anonymous async method, that takes the current HttpContext, and the next Task to execute in the pipeline. If we want to ensure all responses in our ASP.NET Core Web API application return a custom header, we can make use of the ASP.NET Core middleware. Adding Custom Header Globally using Middleware
Testing Custom Header with AttributesĪgain, let’s use Postman to send a GET request to our new endpoint URL of We will now find our custom header, x-my-custom-header with a value of attribute response in the Headers section of the response, which we can apply on an endpoint or controller level. We can add this attribute to many endpoints, and also at the Controller level.
We use our new CustomHeader attribute to decorate the CustomHeaderResponseFromAttribute action, which adds the custom header to our HTTP response. This time, our endpoint is even smaller than the previous example. Public IActionResult CustomHeaderResponseFromAttribute() Now that we have the attribute defined, we need to add this to a new endpoint:
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