How to get a list of all the headers for logging in web api - asp.net-web-api

Question

I want to log all the request headers. I already have a filter like so.
Now how do I get all the request header so that I can log them?
public class LogApiFilter : AbstractActionFilter
{
private readonly ILog m_Log;
public override bool AllowMultiple
{
get
{
return true;
}
}
public LogApiFilter(ILog iLog)
{
if (iLog == null)
throw new ArgumentNullException("log instance injected is null.");
m_Log = iLog;
}
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
base.OnActionExecuted(actionExecutedContext);
}
public override void OnActionExecuting(HttpActionContext context)
{
m_Log.Debug("Web api Controller Name and Action method Name: "
+ context.ActionDescriptor.ControllerDescriptor.ControllerName
+ ", " + context.ActionDescriptor.ActionName);
base.OnActionExecuting(context);
}
}

Answer 1

Ok, for my own records and for others, I have comeup with this. Please do suggest if there is a better way.
private string GetRequestHeaders(HttpActionContext context)
{
// Note you can replace the type names sucha as string, HttpRequestHeaders, List<KeyValuePair<string, IEnumerable<string>>>
// with var keyword where ever possible for readability.
string headerString = string.Empty;
HttpRequestHeaders requestHeaders = context.Request.Headers;
List<KeyValuePair<string, IEnumerable<string>>> headerList = requestHeaders.ToList();
foreach (var header in headerList)
{
string key = header.Key;
List<string> valueList = header.Value.ToList();
string valueString = string.Empty;
foreach (var v in valueList)
{
valueString = valueString + v + "-";
}
headerString = headerString + key + ": " + valueString + Environment.NewLine;
}
return headerString;
}
The above method can be called from the action filter in the question. I am calling it from the method, OnActionExecuting(HttpActionContext context).
I am using ninject for di, so this is how I have configured it.
kernel.BindHttpFilter<LogApiFilter>(System.Web.Http.Filters.FilterScope.Global);
kernel.BindHttpFilter<ApiExceptionFilterAttribute>(System.Web.Http.Filters.FilterScope.Global);
kernel.BindFilter<LogMvcFilter>(System.Web.Mvc.FilterScope.Global, 0);