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C# client

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  1. Getting Started

    1. Creating your first project
      1. Create Service from scratch
    2. Your first webservice explained
    3. ServiceStack's new API Design
    4. Designing a REST-ful service with ServiceStack
    5. Example Projects Overview
    6. Learning Resources
  2. Reference

    1. Order of Operations
    2. The IoC container
    3. Configuration and AppSettings
    4. Metadata page
    5. Rest, SOAP & default endpoints
    6. SOAP support
    7. Routing
    8. Service return types
    9. Customize HTTP Responses
    10. Plugins
    11. Validation
    12. Error Handling
    13. Security
    14. Debugging
    15. JavaScript Client Library (ss-utils.js)
  3. Clients

    1. Overview
    2. C#/.NET client
    3. Add ServiceStack Reference
      1. C# Add Reference
      2. F# Add Reference
      3. VB.NET Add Reference
      4. Swift Add Reference
      5. Java Add Reference
    4. Silverlight client
    5. JavaScript client
      1. Add TypeScript Reference
    6. Dart Client
    7. MQ Clients
  4. Formats

    1. Overview
    2. JSON/JSV and XML
    3. ServiceStack's new HTML5 Report Format
    4. ServiceStack's new CSV Format
    5. MessagePack Format
    6. ProtoBuf Format
  5. View Engines

    1. Razor & Markdown Razor
    2. Markdown Razor
  6. Hosts

    1. IIS
    2. Self-hosting
    3. Messaging
    4. Mono
  7. Security

    1. Authentication/authorization
    2. Sessions
    3. Restricting Services
    4. Encrypted Messaging
  8. Advanced

    1. Configuration options
    2. Access HTTP specific features in services
    3. Logging
    4. Serialization/deserialization
    5. Request/response filters
    6. Filter attributes
    7. Concurrency Model
    8. Built-in caching options
    9. Built-in profiling
    10. Form Hijacking Prevention
    11. Auto-Mapping
    12. HTTP Utils
    13. Virtual File System
    14. Config API
    15. Physical Project Structure
    16. Modularizing Services
    17. MVC Integration
    18. ServiceStack Integration
    19. Embedded Native Desktop Apps
    20. Auto Batched Requests
    21. Versioning
  9. Server Events

    1. Overview
    2. JavaScript Client
    3. C# Server Events Client
    4. Redis Server Events
  10. Encrypted Messaging

    1. Overview
    2. Encrypted Client
  11. Plugins

    1. Auto Query
    2. Server Sent Events
    3. Swagger API
    4. Postman
    5. Request logger
    6. Sitemaps
    7. Cancellable Requests
    8. CorsFeature
  12. Tests

    1. Testing
    2. HowTo write unit/integration tests
  13. ServiceStackVS

    1. Install ServiceStackVS
    2. Add ServiceStack Reference
    3. AngularJS App Template
    4. ReactJS App Template
  14. Other Languages

    1. FSharp
      1. Add ServiceStack Reference
    2. VB.NET
      1. Add ServiceStack Reference
    3. Swift
      1. Swift Add Reference
    4. Java
      1. Add ServiceStack Reference
      2. Android Studio & IntelliJ
      3. Eclipse
  15. Amazon Web Services

    1. ServiceStack.Aws
    2. PocoDynamo
    3. AWS Live Demos
    4. Getting Started with AWS
  16. Deployment

    1. Deploy Multiple Sites to single AWS Instance
      1. Simple Deployments to AWS with WebDeploy
    2. Advanced Deployments with OctopusDeploy
  17. Install 3rd Party Products

    1. Redis on Windows
    2. RabbitMQ on Windows
  18. Use Cases

    1. Single Page Apps
      1. HTML, CSS and JS Minifiers
    2. Azure
      1. Connecting to Azure Redis via SSL
    3. Logging
    4. Bundling and Minification
    5. NHibernate
  19. Performance

    1. Real world performance
  20. Other Products

    1. ServiceStack.Redis
    2. ServiceStack.OrmLite
    3. ServiceStack.Text
  21. Future

    1. Roadmap
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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

Alternatively you can use the HttpClient-based JsonHttpClient in:

PM> Install-Package ServiceStack.HttpClient

These packages also contain PCL versions of the Service Clients available with support for Xamarin.iOS, Xamarin.Android, Windows Store, WPF and Silverlight 5 platforms.


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 provide HTTP verbs (Get, Post & PostFile, Put, Delete, Patch, etc) enabling a productive typed API for consuming ServiceStack Services with their best matching Custom Routes as seen in the examples below:

See IServiceClient for the full API available

Using the New Api

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

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!");

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!" });

Async Example

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

Alternative API

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

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:

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()
    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 responses, e.g:

public class Headers : IReturn<HttpWebResponse>
    public string Text { get; set; }

public class Strings : IReturn<string>
    public string Text { get; set; }

public class Bytes : IReturn<byte[]>
    public string Text { get; set; }

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:

var client = new JsonServiceClient("http://localhost:2020/") {
    ResponseFilter = httpRes => {
        var header = httpRes.Headers["X-Response"];
var response = await client.GetAsync(new Headers { Text = "World" });

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

Sending Raw Data

.NET Service Clients can also send raw string, byte[] or Stream Request bodies in their custom Sync or Async API's, e.g:

string json = "{\"Key\":1}";
client.Post<SendRawResponse>("/sendraw", json);

byte[] bytes = json.ToUtf8Bytes();
client.Put<SendRawResponse>("/sendraw", bytes);

Stream stream = new MemoryStream(bytes);
await client.PostAsync<SendRawResponse>("/sendraw", stream);


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.

Upload and Download Progress on Async API's

The Async API's support on progress updates with the OnDownloadProgress and OnUploadProgress callbacks which can be used to provide UX Progress updates, e.g:

var client = new JsonServiceClient(ListeningOn);

//Available in ASP.NET/HttpListener when downloading responses with known lengths 
//E.g: Strings, Files, etc.
client.OnDownloadProgress = (done, total) =>
    "{0}/{1} bytes downloaded".Print(done, total);

var response = await client.GetAsync(new Request());

Note: total = -1 when 'Transfer-Encoding: chunked'

Whilst the OnUploadProgress callback gets fired when uploading files, e.g:

client.OnUploadProgress = (bytesWritten, total) => 
    "Written {0}/{1} bytes...".Print(bytesWritten, total);

    new FileInfo(path), new Upload { CreatedBy = "Me" });

Custom Client Caching Strategy

The ResultsFilter and ResultsFilterResponse delegates on Service Clients can be used to enable a custom caching strategy.

Here's a basic example implementing a cache for all GET Requests:

var cache = new Dictionary<string, object>();

client.ResultsFilter = (type, method, uri, request) => {
    if (method != HttpMethods.Get) return null;
    object cachedResponse;
    cache.TryGetValue(uri, out cachedResponse);
    return cachedResponse;
client.ResultsFilterResponse = (webRes, response, method, uri, request) => {
    if (method != HttpMethods.Get) return;
    cache[uri] = response;

//Subsequent requests returns cached result
var response1 = client.Get(new GetCustomer { CustomerId = 5 });
var response2 = client.Get(new GetCustomer { CustomerId = 5 }); //cached response

The ResultsFilter delegate is executed with the context of the request before the request is made. Returning a value of type TResponse short-circuits the request and returns that response. Otherwise the request continues and its response passed into the ResultsFilterResponse delegate where it can be cached.

Implicitly populate SessionId and Version Number

Service Clients can be used to auto-populate Request DTO's implementing IHasSessionId or IHasVersion by assigning the Version and SessionId properties on the Service Client, e.g:

client.Version = 1;
client.SessionId = authResponse.SessionId;

Which populates the SessionId and Version number on each Request DTO's that implementing the specific interfaces, e.g:

public class Hello : IReturn<HelloResponse>, IHasSessionId, IHasVersion {
    public int Version { get; set; }
    public string SessionId { get; set; }
    public string Name { get; set; }

client.Get(new Hello { Name = "World" }); //Auto populates Version and SessionId

HTTP Verb Interface Markers

You can decorate your Request DTO's using the IGet, IPost, IPut, IDelete and IPatch interface markers and the Send and SendAsync API's will use it to automatically send the Request using the selected HTTP Method. E.g:

public class HelloByGet : IReturn<HelloResponse>, IGet 
    public string Name { get; set; }
public class HelloByPut : IReturn<HelloResponse>, IPut 
    public string Name { get; set; }

var response = client.Send(new HelloByGet { Name = "World" }); //GET

await client.SendAsync(new HelloByPut { Name = "World" }); //PUT

Interface markers is supported in all .NET Service Clients, they're also included in the generated Add ServiceStack Reference DTO's so they're also available in the Java JsonServiceClient and Swift JsonServiceClient. It's also available in our 3rd Party StripeGateway.

Whilst a simple feature, it enables treating your remote services as a message-based API yielding its many inherent advantages where your Application API's need only pass Request DTO models around to be able to invoke remote Services, decoupling the Service Request from its implementation which can be now easily managed by a high-level adapter that takes care of proxying the Request to the underlying Service Client. The adapter could also add high-level functionality of it's own including auto retrying of failed requests, generic error handling, logging/telemetrics, event notification, throttling, offline queuing/syncing, etc.

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.


The new JsonHttpClient is an alternative to the existing generic typed JsonServiceClient for consuming ServiceStack Services which instead of using HttpWebRequest is based on Microsoft's latest async HttpClient.

JsonHttpClient implements the full IServiceClient API making it an easy drop-in replacement for your existing JsonServiceClient where in most cases it can simply be renamed to JsonHttpClient, e.g:

//IServiceClient client = new JsonServiceClient("");
IServiceClient client = new JsonHttpClient("");

var response = await client.GetAsync(new GetTechnology { Slug = "servicestack" })


JsonHttpClient can be downloaded from NuGet at:

> Install-Package ServiceStack.HttpClient


One of the primary benefits of being based on HttpClient is being able to make use of ModernHttpClient which provides a thin wrapper around iOS's native NSURLSession or OkHttp client on Android, offering improved stability for 3G mobile connectivity.

To enable, install ModernHttpClient then set the Global HttpMessageHandler Factory to configure all JsonHttpClient instances to use ModernHttpClient's NativeMessageHandler:

JsonHttpClient.GlobalHttpMessageHandlerFactory = () => new NativeMessageHandler()

Alternatively, you can configure a single client instance to use ModernHttpClient with:

client.HttpMessageHandler = new NativeMessageHandler();

Differences with JsonServiceClient

Whilst the goal is to retain the same behavior in both clients, there are some differences resulting from using HttpClient where the Global and Instance Request and Response Filters are instead passed HttpClients HttpRequestMessage and HttpResponseMessage.

Also, all API's are Async under-the-hood where any Sync API's that doesn't return a Task<T> just blocks on the Async Task.Result response. As this can dead-lock in certain environments we recommend sticking with the Async API's unless safe to do otherwise.

HttpWebRequest Service Clients

Whilst the list below contain the built-in clients based on .NET's built-in HttpWebRequest:


The HttpWebRequest clients above are available in:

> Install-Package ServiceStack.Client

Community Resources

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