Discussion on: Make SOAP requests using IHttpClientFactory in .NET Core

[nlyk]

It's really helpful. Unfortunately, I have not been able to add custom HTTP Headers to the request so far. Any suggestions;

[Bojan Nikolić]

You can add them through additional DelegatingHandler which you would add to the HttpClient setup. So, create something like TraceLogHandler and append a header.
So, something like

internal class HeaderHandler : DelegatingHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        request.Headers.Add("X-MyHeader", "MyValue");

        return base.SendAsync(request, cancellationToken);
    }
}

Then in Startup.cs first register it

services.AddScoped<HeaderHandler>();

and then add it to the HttpClient setup e.g. before AddHeaderPropagation line

.AddHttpMessageHandler<HeaderHandler>()

Let me know if this is not what you had in mind or it doesn't work for your case.