This is some kind of a RestSharp port to PCL.

Version 3.0.0 will come soon and it will contain breaking changes:

• The IRestRequest.Credentials property moved to IRestClient.Credentials
• Credentials for authenticators are specified using the IRestClient.Credentials property
• New core library that contains all interfaces and other generic stuff
• New interface for proxies
• New interfaces that are an abstraction of the HttpClient and its request/response messages
• Uses now a RestSharp project compatible Method enumeration for HTTP requests
• Support for WebRequest as back-end for RestSharp.Portable

• Revert to Portable.BouncyCastle-Signed to be able to use a release version
• Use the JetBrains.Annotations assembly to fix problems when creating CoreCLR assemblies that want to use JetBrains.Annotations too

• Don't discard GetOrPost parameters when using PUT or PATCH

• Fix for issue #42

• Support more headers when using HttpWebRequest instead of HttpClient
• New UserAgent property for IRestClient
• Activated automatic decompression for HttpClient and HttpWebRequest

• Refactoring to reduce source code duplication by adding a RestClientBase class
• Allow customization of HttpWebRequest creation to allow the usage of client certificates
• Support for RSA-SHA1 for platforms with full .NET Framework support
• New OAuth 1.0 test that uses oauthbin.com

• Fixed HttpWebRequest usage for Windows Store apps

• Added PCL for OAuth/OAuth2 with profile 259 (better for platforms that don't target .NET 4.0 or SL5)
• Make all assemblies containing WebRequest implementations signed

• Added RestSharp implementation using WebRequest instead of HttpClient
• Added PCL optimizations (for .NET 4.5 and up)

• Moved all interfaces and other generic stuff into a separate core library that doesn't have any dependencies
• New interfaces that are an abstraction of the HttpClient and its request/response messages
• New interface for proxies
• Uses now a RestSharp project compatible Method enumeration for HTTP requests and all constructors taking a HttpMethod are flagged as obsolete
• The IAuthenticator, ISerializer, IEncoding, and IDeserializer interfaces were moved to the RestSharp.Portable namespace

• Revamped authenticator interfaces
  • Provide a way to process the Www-Authenticate header
  • Make HTTP Basic/Digest authenticators work with Proxy-Authenticate header
  • Credentials property moved from IRestRequest to IRestClient
  • The NTLM authenticator is not needed anymore, because the the credentials from the IRestRequest are automatically used in the HttpClientHandler which handles the Basic/Digest/NTLM authentication automatically
  • All authenticators should query the credentials passed to the authenticator
  • New AuthenticationChallengeHandler which selects one of the registered authenticators in response to a Www-Authenticate or Proxy-Authenticate challenge.
• New Gitter OAuth 2.0 client

• Bugfix for issue #29.

• Bugfix for issue #23. Thanks to GeirGrusom

• Bugfix for issue #25. We're using asynchronous locking now.

• Bugfix for issue #24 which should allow using both OAuth 1.0 and 2.0 in Android apps.

• New Timeout property to fix issue #13 with CancellationTokenSource.CancelAfter

• Fixes concurrent requests on the same RestClient (fixes #19, bug introduced with #11)

• Fixes issue #18
  • All DateTime(Offset) HTTP header values are encoded as described in RFC 1123 after conversion to UTC/GMT
• All data is converted to a string using the en-US culture (might be a breaking change)

• Fixes issue #17
  • New IsSuccess property for IRestResponse

• Fixes issue #15
  • Add the ability to provide a custom timestamp provider
• Fixes issue #16
  • Remove superfluous "?" when using URL segment parameters in the query string

• Fixed broken SL5 support (thanks to P2SH)

• Fixes issue #11
  • IRestClient now derives from IDisposable
  • HttpClient is kept alive until the RestClient gets disposed
  • Default HTTP header parameters are set for the HttpClient
• Fixes issue #12
  • Workaround for the 32k limit of EscapeDataString
  • Custom class for URL encoding that's used as fall-back, when the user wants to use EscapeDataString with a byte array (which isn't supported).
• Avoid rebuilding the Basic Authentication header for each request

• Fixed NuGet dependency for the OAuth 1.0 package
• Fixed some problems found by FxCop

• Fixed NuGet package for Xamarin.iOS (upload using nuget instead of NPE)

• Fixed Microsoft.Bcl and Microsoft.Bcl.Build dependencies
• Assemblies are now CLSCompliant (except PCL and SL5, which don't support this attribute)

• Removed all deprecated methods
• Starting from this version, I'll use Semantic Versioning 2.0.0
• Optimizing NuGet dependencies for several platforms
• Clear Accept HTTP header parameter for the SL5 platform for GET requests (Issue #9)
• Add Deflate encoding

• OAuth2AuthorizationRequestHeaderAuthenticator should only check for Authorization header parameter
• Better handling of refresh tokens in the OAuth2AuthorizationRequestHeaderAuthenticator

• Increased compatibility with the original RestSharp project
  • BuildUri instead of BuildUrl (deprecated)
  • Added AddJsonBody, AddXmlBody, AddQueryParameter, AddObject
• Graceful handling of duplicate parameters (might be a breaking change)
• Dispose HttpClient, HttpRequestMessage and the HttpResponseMessage

• BuildUrl adds a "/" between a base URL and resource if neither of them is empty and the "/" is missing
• Fix BOM for XmlDataContractSerializer
• Better support for OAuth2 refresh tokens by supporting a HTTP 401 by the OAuth2 authenticator (when a refresh token was set)

• Support for parameters in IRestClient.BaseUrl
• Signed OAuth1/OAuth2 assemblies
• Increased compatibility for empty IRestClient.BaseUrl

• Workaround for NuGet pack bug

• Encodings for parameters (get/post/url/query)

• Async. authenticators
• New OAuth2 package

• Cancellable requests
• New OAuth 1.0 package

• .NET Framework 4
• .NET for Windows Store apps
• .NET Native
• Windows Phone 8 and 8.1
• Silverlight 5
• Portable Class Libraries
• Xamarin Android
• Xamarin MonoTouch / iOS

The following is an example to get the ticker from the bitstamp.net website.

public class TickerResult
{
	public decimal Last { get; set; }
	public decimal High { get; set; }
	public decimal Low { get; set; }
	public decimal Volume { get; set; }
	public decimal Bid { get; set; }
	public decimal Ask { get; set; }
}

We use the class with:

using (var client = new RestClient(new Uri("https://www.bitstamp.net/api/")))
{
    var request = new RestRequest("ticker", HttpMethod.Get);
    var result = await client.Execute<TickerResult>(request);
}

The support for community projects can be found in my subreddit /r/FubarDev.

You can get professional support here: Fubar Development Junker