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Using DTOs to define your web service interface makes it possible to provide strong-typed generic service clients without any code-gen or extra build-steps, leading to a productive end-to-end type-safe communication gateway from client to server.

Note: you have to install the NuGet package ServiceStack.Client in your client project, e.g. with the following command in the package manager console:

PM> Install-Package ServiceStack.Client

REST API

All ServiceStack's C# clients share the same interfaces and are created by passing in the Base URI of your ServiceStack service in the clients constructor, e.g. if your ServiceStack instance was hosted on the root path / on the 8080 custom port:

var client = new JsonServiceClient("http://host:8080/");

Or if hosted on the /api custom path:

var client = new JsonServiceClient("http://host/api/");

In addition, the service clients also provide HTTP verbs (Get, Post & PostFile, Put, Delete) letting you call your custom user-defined routes REST-fully e.g:

Using the New Api

HelloResponse response = client.Get(new Hello { Name = "World!" });
response.Result.Print();

Async Example

Using C# await:

HelloResponse response = await client.GetAsync(new Hello { Name = "World!" });

Using Tasks:

client.GetAsync(new Hello { Name = "World!" })
    .Success(r => r => r.Result.Print())
    .Error(ex => { throw ex; });

Alternative API

var response = client.Get<HelloResponse>("/hello/World!");
response.Result.Print();

Async Example

var response = await client.GetAsync<HelloResponse>("/hello/World!");

Service Client API

C#/.NET Clients can call the above Hello Service using any of the JSON, JSV, XML or SOAP Service Clients with the code below:

Using the New Api

var response = client.Send(new Hello { Name = "World!" });
response.Result.Print();

Async Example

var response = await client.SendAsync(new Hello { Name = "World!" });
response.Result.Print();

Alternative API

var response = client.Send<HelloResponse>(new Hello { Name = "World!" });
response.Result.Print();

Async Example

var response = await client.SendAsync<HelloResponse>(new Hello { Name = "World!" });

The service clients use the automatic pre-defined routes for each service.

Support for Native built-in Response Types

All of ServiceStack's generic Service Clients also allow you to fetch raw string, byte[] and Stream responses of any existing service, or when you need it, the underlying HttpWebResponse allowing fine-grained access to the HTTP Response. e.g With just the Service below:

[Route("/poco/{Text}")]
public class Poco : IReturn<PocoResponse>
{
    public string Text { get; set; }
}

public class PocoResponse
{
    public string Result { get; set; }
}

public class NativeTypesExamples : Service
{
    public PocoResponse Any(Poco request)
    {
        base.Response.AddHeader("X-Response", request.Text);
        return new PocoResponse { Result = "Hello, " + (request.Text ?? "World!") };
    }
}

You can access it normally with the typed API:

PocoResponse response = client.Get(new Poco { Text = "World" });
response.Result //Hello, World

Or as get the JSON as a raw string:

string responseJson = client.Get<string>("/poco/World");
var dto = responseJson.FromJson<PocoResponse>();
dto.Result //Hello, World

Or as raw bytes:

byte[] responseBytes = client.Get<byte[]>("/poco/World");
var dto = responseBytes.FromUtf8Bytes().FromJson<PocoResponse>();
dto.Result //Hello, World

Or as a Stream:

using (Stream responseStream = client.Get<Stream>("/poco/World")) {
    var dto = responseStream.ReadFully().FromUtf8Bytes().FromJson<PocoResponse>();
    dto.Result //Hello, World
}

Or even access the populated HttpWebResponse object:

HttpWebResponse webResponse = client.Get<HttpWebResponse>("/poco/World");

webResponse.Headers["X-Response"] //World
using (var stream = webResponse.GetResponseStream())
using (var sr = new StreamReader(stream)) {
    var dto = sr.ReadToEnd().FromJson<PocoResponse>();
    dto.Result //Hello, World
}

Accessing raw service responses

ServiceStack isn't limited to just returning POCO's as you can effectively return anything you want even images /helloimage/ServiceStack?Width=600&height=300&Foreground=Yellow. These native responses can also be mark on your Request DTO IReturn<T> interface marker to give you a terse end-to-end API for fetching raw responess, e.g:

[Route("/headers/{Text}")]
public class Headers : IReturn<HttpWebResponse>
{
    public string Text { get; set; }
}

[Route("/strings/{Text}")]
public class Strings : IReturn<string>
{
    public string Text { get; set; }
}

[Route("/bytes/{Text}")]
public class Bytes : IReturn<byte[]>
{
    public string Text { get; set; }
}

[Route("/streams/{Text}")]
public class Streams : IReturn<Stream>
{
    public string Text { get; set; }
}

public class BuiltInTypesService : Service
{
    public void Any(Headers request)
    {
        base.Response.AddHeader("X-Response", request.Text);
    }

    public string Any(Strings request)
    {
        return "Hello, " + (request.Text ?? "World!");
    }

    public byte[] Any(Bytes request)
    {
        return new Guid(request.Text).ToByteArray();
    }

    public byte[] Any(Streams request)
    {
        return new Guid(request.Text).ToByteArray();
    }        
}

Which let you access the results as you would a normal response:

HttpWebResponse response = client.Get(new Headers { Text = "World" });
response.Headers["X-Response"] // "World"

string response = client.Get(new Strings { Text = "World" });
response // Hello, World

byte[] response = client.Get(new Bytes { Text = Guid.NewGuid().ToString() });
var guid = new Guid(response);

Stream response = client.Get(new Streams { Text = Guid.NewGuid().ToString() });
using (response)
    var guid = new Guid(response.ReadFully());

All these APIs are also available asynchronously as well:

HttpWebResponse response = await client.GetAsync(new Strings { Text = "Test" });
response.Headers["X-Response"] // "World"

string response = await client.GetAsync(new Strings { Text = "World" });
response // Hello, World

byte[] response = await client.GetAsync(new Bytes { Text = Guid.NewGuid().ToString() });
var guid = new Guid(response);

Stream response = await client.GetAsync(new Streams { Text = Guid.NewGuid().ToString() });
using (response)
    var guid = new Guid(response.ReadFully());

They all behave the same as the sync versions except for HttpWebResponse which gets returned just after the request is sent (asynchronously) and before any response is read so you can still access the HTTP Headers e.g:

client.GetAsync(new Headers { Text = "World" }, r => r.Headers["X-Response"], //World
    (r, ex) => { throw ex; });

Which makes a great starting point if you want to stream the responses back asynchronously as seen in this Reactive ServiceStack example by @rodrigobamboo.

More examples can be found in the ServiceClients Built-in native type response tests

Authentication

ServiceStack's Auth Tests shows different ways of authenticating when using the C# Service Clients. By default BasicAuth and DigestAuth is built into the clients, e.g:

var client = new JsonServiceClient(baseUri) {
    UserName = UserName,
    Password = Password,
};

var request = new Secured { Name = "test" };
var response = client.Send<SecureResponse>(request);    

Behind the scenes ServiceStack will attempt to send the request normally but when the request is rejected and challenged by the Server the clients will automatically retry the same request but this time with the Basic/Digest Auth headers.

To skip the extra hop when you know you're accessing a secure service, you can tell the clients to always send the BasicAuth header with:

client.AlwaysSendBasicAuthHeader = true;

The alternative way to Authenticate is to make an explicit call to the Auth service (this requires CredentialsAuthProvider enabled) e.g:

AuthResponse authResponse = client.Post(new Auth {
    provider = CredentialsAuthProvider.Name,
    UserName = "user",
    Password = "p@55word",
    RememberMe = true,  //important tell client to retain permanent cookies
});

var request = new Secured { Name = "test" };
var response = client.Send<SecureResponse>(request);    

After a successful call to the Auth service the client is Authenticated and if RememberMe is set, the client will retain the Session Cookies added by the Server on subsequent requests which is what enables future requests from that client to be authenticated.


Built-in Clients

All REST and ServiceClients share the same interfaces (IServiceClient, IRestClient and IRestClientAsync) so they can easily be replaced (for increased perf/debuggability/etc) with a single line of code.

Here's a list of all built-in clients:

Community Resources

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