HttpClient + PATCH support

From - http://compiledexperience.com/blog/posts/patch-support-in-httpclient/

public static class HttpClientExtensions  
{  
    public async static Task<HttpResponseMessage> PatchAsync(this HttpClient client, string requestUri, HttpContent content)  
    {  
        var method = new HttpMethod("PATCH");  
  
        var request = new HttpRequestMessage(method, requestUri)  
        {  
            Content = content  
        };  
  
        return await client.SendAsync(request);  
    }  
  
    public async static Task<HttpResponseMessage> PatchAsync(this HttpClient client, Uri requestUri, HttpContent content)  
    {  
        var method = new HttpMethod("PATCH");  
  
        var request = new HttpRequestMessage(method, requestUri)  
        {  
            Content = content  
        };  
  
        return await client.SendAsync(request);  
    }  
  
    public async static Task<HttpResponseMessage> PatchAsync(this HttpClient client, string requestUri, HttpContent content, CancellationToken cancellationToken)  
    {  
        var method = new HttpMethod("PATCH");  
  
        var request = new HttpRequestMessage(method, requestUri)  
        {  
            Content = content  
        };  
  
        return await client.SendAsync(request, cancellationToken);  
    }  
  
    public async static Task<HttpResponseMessage> PatchAsync(this HttpClient client, Uri requestUri, HttpContent content, CancellationToken cancellationToken)  
    {  
        var method = new HttpMethod("PATCH");  
  
        var request = new HttpRequestMessage(method, requestUri)  
        {  
            Content = content  
        };  
  
        return await client.SendAsync(request, cancellationToken);  
    }  
}