Set or read Date in HTTP header (Windows Phone 8) - http

Question

Does anyone knows of a way to set or read the 'Date' HTTP header in an HTTP GET request on Windows Phone 8?
I need to be able to set the value of the Date header or at least read the value that will actually be sent in the request.
I have tried with something like:
var web_request = HttpWebRequest.CreateHttp(url);
web_request.Headers["Date"] = the_date;
But this produces an exception at run time:
System.ArgumentException: The 'Date' header must be modified using the appropriate property or method.
There's sample code here with HttpClient but this is apparently not available under Windows Phone 8:
How do you set the Content-Type header for an HttpClient request?
I have tried reading the date as well but after:
var web_request = HttpWebRequest.CreateHttp(url);
The date does not seem to be set yet.

Answer 1

That worked well after adding "Microsoft HTTP Client Libraries".
However there is still a problem in this library on WindowsPhone Platform.
PROBLEM:
I have a scenario where i want to add a "Date" header in a specific format, so i used
string customDate = "11/29/2013 7:46:25"
DefaultRequestHeaders.TryAddWithoutValidation("Date", customDate);
the above line adds the "Date" header, that means it does not throw any exception, but when i checked in fidler there is no "Date" header added. The same code works well in Windows8 store apps.
Looks like there is a bug in "Microsoft HTTP Client Libraries" for WindowsPhone8 platform.

Answer 2

By using "Microsoft HTTP Client Libraries" for Date header works well and good if Date is of DateTime object, however if i want to assign a value to Date header in a specific format as mentioned in earlier post then it does not get added.

Answer 3

Its a header with built-in support that you need to set/get explicitly;
web_request.Date = DateTime.UtcNow;
(Its default is 01/01/0001 00:00:00 which is not sent in the request)

Answer 4

The problem with:
web_request.Date
is that there is no "Date" property in the Windows Phone 8 version of HttpWebRequest.
See: http://social.msdn.microsoft.com/Forums/windowsapps/en-US/5738e95a-5afe-4a49-929d-b51490a5480b/httpwebrequest-date-property-missing
In this link it is suggested to use HttpClient and HttpRequestMessage. Example:
HttpClient client = new HttpClient();
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, url);
request.Headers.Date = DateTime.Now.Subtract(new TimeSpan(10, 0, 0));
HttpResponseMessage response = client.SendAsync(request).Result;
string resultCode = response.StatusCode.ToString();
I was stuck because HttpClient and HttpRequestMessage seem not to be available for Windows Phone 8 either. But it is possible to add them:
In Visual Studio (Express) 2012 for Windows Phone:
TOOLS -> Library Package Manager -> Manage NuGet Packages for Solution...
Then search for "Microsoft HTTP Client Libraries" and install it.
After that System.Net.Http is available and the HttpClient solution can be used.