# System.Net.Http

``` diff
 namespace System.Net.Http {
     public class ByteArrayContent : HttpContent {
+        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
     }
     public class FormUrlEncodedContent : ByteArrayContent {
+        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
     }
     public class HttpClient : HttpMessageInvoker {
+        public static IWebProxy DefaultProxy { get; set; }
+        public Version DefaultRequestVersion { get; set; }
+        public Task<byte[]> GetByteArrayAsync(string requestUri, CancellationToken cancellationToken);
+        public Task<byte[]> GetByteArrayAsync(Uri requestUri, CancellationToken cancellationToken);
+        public Task<Stream> GetStreamAsync(string requestUri, CancellationToken cancellationToken);
+        public Task<Stream> GetStreamAsync(Uri requestUri, CancellationToken cancellationToken);
+        public Task<string> GetStringAsync(string requestUri, CancellationToken cancellationToken);
+        public Task<string> GetStringAsync(Uri requestUri, CancellationToken cancellationToken);
     }
     public abstract class HttpContent : IDisposable {
+        public Task CopyToAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
+        public Task CopyToAsync(Stream stream, CancellationToken cancellationToken);
+        protected virtual Task<Stream> CreateContentReadStreamAsync(CancellationToken cancellationToken);
+        public Task<byte[]> ReadAsByteArrayAsync(CancellationToken cancellationToken);
+        public Task<Stream> ReadAsStreamAsync(CancellationToken cancellationToken);
+        public Task<string> ReadAsStringAsync(CancellationToken cancellationToken);
+        protected virtual Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
     }
     public class HttpRequestException : Exception {
+        public HttpRequestException(string message, Exception inner, HttpStatusCode? statusCode);
+        public HttpStatusCode? StatusCode { get; }
     }
     public class MultipartContent : HttpContent, IEnumerable, IEnumerable<HttpContent> {
+        protected override Task<Stream> CreateContentReadStreamAsync(CancellationToken cancellationToken);
+        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
     }
     public class MultipartFormDataContent : MultipartContent {
+        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
     }
     public sealed class ReadOnlyMemoryContent : HttpContent {
+        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
     }
+    public sealed class SocketsHttpHandler : HttpMessageHandler {
+        public SocketsHttpHandler();
+        public bool AllowAutoRedirect { get; set; }
+        public DecompressionMethods AutomaticDecompression { get; set; }
+        public TimeSpan ConnectTimeout { get; set; }
+        public CookieContainer CookieContainer { get; set; }
+        public ICredentials Credentials { get; set; }
+        public ICredentials DefaultProxyCredentials { get; set; }
+        public TimeSpan Expect100ContinueTimeout { get; set; }
+        public int MaxAutomaticRedirections { get; set; }
+        public int MaxConnectionsPerServer { get; set; }
+        public int MaxResponseDrainSize { get; set; }
+        public int MaxResponseHeadersLength { get; set; }
+        public TimeSpan PooledConnectionIdleTimeout { get; set; }
+        public TimeSpan PooledConnectionLifetime { get; set; }
+        public bool PreAuthenticate { get; set; }
+        public IDictionary<string, object> Properties { get; }
+        public IWebProxy Proxy { get; set; }
+        public TimeSpan ResponseDrainTimeout { get; set; }
+        public SslClientAuthenticationOptions SslOptions { get; set; }
+        public bool UseCookies { get; set; }
+        public bool UseProxy { get; set; }
+        protected override void Dispose(bool disposing);
+        protected internal override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken);
+    }
     public class StreamContent : HttpContent {
+        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
     }
     public class StringContent : ByteArrayContent {
+        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken);
     }
 }
```