How to add headers to HttpRequestMessageProperty in UWP
<p>I'm migrating some code to Universal Windows project from native C# project and trying to perform the following:</p>

<pre><code>HttpRequestMessageProperty httpRequestProperty = new HttpRequestMessageProperty();

httpRequestProperty.Headers.Add("X-EBAY-SOA-SECURITY-APPNAME", "APPID");
httpRequestProperty.Headers.Add("X-EBAY-SOA-OPERATION-NAME", "findItemsByKeywords");
httpRequestProperty.Headers.Add("X-EBAY-SOA-GLOBAL-ID", "EBAY-US");

OperationContext.Current.OutgoingMessageProperties[HttpRequestMessageProperty.Name] = httpRequestProperty;
</code></pre>

<p>while in the C# native i am able to add headers to the collection, in UWP it's impossible.
seems like the HttpRequestMessageProperty.Headers in the System.ServiceModel.Http Version 4.0.1.0 is a Getter only...</p>

<p>what is the alternative in UWP ? 
How can i add headers to the collection ?</p>