Add custom response header

Question

User1587609066 posted

Hi,

I want add a custom response header with all.

I add in the Configure Method in Startup.cs

app.Use(async (context, next) => { context.Response.Headers.Append("my-header", "*"); await next(); });

 Why this has no effect?  How to do it?

Thanks!

Answer 1

User-1084200161 posted

It works for me, using your code in Beta 6.  One thing to remember is to place this at the right spot... since you said you wanted this for everything, you'd probably put it towards the top of Configure method.  For example, if using MVC, you'd want this above app.UseMvc() line..

Answer 2

User-1273603057 posted

The code below produces the following Web browser results:

Server=Microsoft-IIS/10.0
my-header=*
Hello World!

using System.Linq;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Http;
using Microsoft.Framework.DependencyInjection;

namespace WebAppLight
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
        }

        private const string CR = "<BR>";

        public void Configure(IApplicationBuilder app)
        {
            app.Use(async (context, next) => 
            {
                context.Response.Headers.Append("my-header", "*");
                await next();
            });

            app.Run(async (context) =>
            {
                var headerString = string.Join(CR,
                    context.Response.Headers
                        .Select(r => r.Key + "=" + r.Value.First()));

                await context.Response.WriteAsync(headerString+CR);
                await context.Response.WriteAsync("Hello World!");
            });
        }
    }
}