Swashbuckle.aspnetcore: add headers to a response

[will-beta]

I’m wondering if it’s possible to add customized headers to a response, for the support of pagination in RESTful APIs.

[SimonTouchtech]

The Response class has a Headers property but as far as I can see it's never set anywhere in the Swashbuckle code. You can set it yourself though, probably using an OperationFilter is the best approach.

[will-beta]

@SimonTouchtech Thanks! It works!

[freeranger]

@will-beta - care to share a code sample for the benefit of others?

Thanks

[will-beta]

@freeranger

```c#
///

/// custom attribute for API
///

class ResponseHeaderAttribute : Attribute
{
public string HttpCode { get; set; }
public string Name { get; set; }
public Type Type { get; set; }
public object Default { get; set; }
public string Description { get; set; }
}

```c#
        class ResponseHeaderOperationFilter : IOperationFilter
        {
            public void Apply(Operation operation, OperationFilterContext context)
            {
                context?.ApiDescription?.ActionAttributes()
                    ?.OfType<ResponseHeaderAttribute>()
                    ?.ToList()
                    ?.ForEach(a =>
                    {
                        var response = operation.Responses[a.HttpCode];
                        if (response != null)
                        {
                            response.Headers = response.Headers ?? new System.Collections.Generic.Dictionary<string, Header>();
                            response.Headers.Add(a.Name, new Header { Type = a.Type.Name, Default = a.Default, Description = a.Description });
                        }
                    });

            }
        }

[freeranger]

Thanks @will-beta