pmilet.Playback 1.1.2

.NET Core 1.1 .NET Standard 2.0 .NET Framework 4.5.2
There is a newer version of this package available.
See the version list below for details.
NuGet\Install-Package pmilet.Playback -Version 1.1.2
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
dotnet add package pmilet.Playback --version 1.1.2
<PackageReference Include="pmilet.Playback" Version="1.1.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add pmilet.Playback --version 1.1.2
#r "nuget: pmilet.Playback, 1.1.2"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install pmilet.Playback as a Cake Addin
#addin nuget:?package=pmilet.Playback&version=1.1.2

// Install pmilet.Playback as a Cake Tool
#tool nuget:?package=pmilet.Playback&version=1.1.2

Asp.Net Core Playback

An Asp.Net Core middleware library for recording and replaying http requests using a playback identifier.


Record http requests in your production environment and replay them locally in your localhost by refering to the recorded playback id. The playback ids are easy to use as regression or load tests.

How to record and playback Api requests?

Once your Asp.NetCore Api is configured for playback ( see quick start section below or refer to sample in github repo ) you can start recording your api requests by setting the X-Playback-Mode request header value to Record.

curl -X GET --header 'Accept: text/plain' --header 'X-Playback-Mode: Record' ''

then a x-playback-id response header will be returned.

Response Headers
  "date": "Wed, 25 Oct 2017 21:05:46 GMT",
  "content-encoding": "gzip",
  "server": "Kestrel",
  "x-powered-by": "ASP.NET",
  "vary": "Accept-Encoding",
  "content-type": "text/plain; charset=utf-8",
  "transfer-encoding": "chunked",
  "x-playback-id": "_ApiGateway+Sample_v1.0_Hello%252Fhello_GET_757602046"

To replay set the X-Playback-Mode header to Playback and the X-Playback-Id header with the value received from the recording response.

curl -X GET --header 'Accept: text/plain' --header 'X-Playback-Id: _ApiGateway+Sample_v1.0_Hello%252Fhello_GET_757602046' --header 'X-Playback-Mode: Playback' ''

When setting the x-playback-mode to None the playback functionality is bypassed.

PlaybackId format

The playback id is composed of differents parts each one carrying important context information. The playback id parts are separated by an underscore :


  • The PlayContextInfo comes from the X-Playback-RequestContext header.
  • The ApiName is the web api Name.
  • The PlaybackVersion comes from the X-Playback-Version header.
  • The RequestPath is the request path url encoded
  • The RequestMethod is the request http verb
  • The RequestContextHash is a hash of the request payload in order to univoquely indentify each different request.

For example this playbackid DemoUser_ApiGateway+Sample_v1.0_Hello%252Fhello_GET_757602046 can be descompsed as:

  • PlayContextInfo = DemoUser
  • AssemblyName = ApiGateway+Sample
  • PlaybackVersion = v1.0
  • RequestPath = Hello%252Fhello
  • RequestMethod = GET
  • RequestContextHash = 757602046

How to Quick Start

In your Startup class:

Configure Playback middleware.

using pmilet.Playback;


public Startup(IHostingEnvironment env)
            var builder = new ConfigurationBuilder()
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
            Configuration = builder.Build();

public IServiceProvider ConfigureServices(IServiceCollection services)
            //don't forget to return the service provider
            return services.BuildServiceProvider();

 public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)

In your appsetings.json file:

Add playback storage section

  "PlaybackBlobStorage": {
    "ConnectionString": "UseDevelopmentStorage=true",
    "ContainerName": "playback"

In your controllers:

if using swagger, decorate your controller for swagger to generate playback headers in swagger UI  

using pmilet.Playback;


  public async Task<string> Get()

How to record responses received from outgoing requests

For recording responses from outgoing requests you should use the PlaybackContext class that can be injected in your api proxies.

this code excerpt show how you can save a response received from an outgoing api call

       var response = await httpClient.GetAsync(url);
       var result = await response.Content.ReadAsStringAsync();
       if (_playbackContext.IsRecord)
                await _playbackContext.RecordResult<MyServiceResponse>(result);
            else if ( _playbackContext.IsPlayback )
                return await _playbackContext.PlaybackResult<MyServiceResponse>();

How to fake api responses

For faking api call responses implement a class that inherits from IFakeFactory like in the following example:

public class MyPlaybackFakeFactory : FakeFactoryBase
        public override void GenerateFakeResponse(HttpContext context)
            switch (context.Request.Path.Value.ToLower())
                case "/api/hello":
                    if (context.Request.Method == "POST")
                        GenerateFakeResponse<HelloRequest, string>(context, HelloPost);
                    else if (context.Request.Method == "GET")
                        GenerateFakeResponse<string, string>(context, HelloGet);
                    throw new NotImplementedException("fake method not found");

Then don't forget to register your fake factory duting initialization:

public IServiceProvider ConfigureServices(IServiceCollection services)
            services.AddPlayback(Configuration, fakeFactory: new MyPlaybackFakeFactory());
Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows
.NET Core netcoreapp1.1 netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net452 net46 net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

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Version Downloads Last updated
1.2.2 1,321 4/1/2019
1.2.1 917 2/19/2018
1.2.0 817 2/19/2018
1.1.2 897 1/23/2018
1.1.1 947 1/23/2018
1.1.0 821 1/23/2018
1.0.10 1,585 10/27/2017
1.0.9 1,141 10/25/2017
1.0.8 866 10/25/2017
1.0.7 1,000 10/22/2017
1.0.6 822 10/21/2017
1.0.5 758 10/21/2017
1.0.4 799 10/21/2017
1.0.3 772 10/18/2017
1.0.2 753 10/18/2017
1.0.1 769 10/18/2017
1.0.0 652 10/15/2017

new file storage service