Fluent.Backdoor 1.0.17

dotnet add package Fluent.Backdoor --version 1.0.17
NuGet\Install-Package Fluent.Backdoor -Version 1.0.17
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.
<PackageReference Include="Fluent.Backdoor" Version="1.0.17" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Fluent.Backdoor --version 1.0.17
#r "nuget: Fluent.Backdoor, 1.0.17"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Fluent.Backdoor as a Cake Addin
#addin nuget:?package=Fluent.Backdoor&version=1.0.17

// Install Fluent.Backdoor as a Cake Tool
#tool nuget:?package=Fluent.Backdoor&version=1.0.17


If you need to keep your app services on a tight leash, while still being able to verify app slots using smoke tests and perhaps warmups, then this could help you. A need based on keeping an app-service url hidden, while warming up a production slot in Azure made me create this little configurable function.

The syntax is:

  1. What do we Require() (IP/Cookie/Queystring)? And if fulfilled:
  2. how long will it Allow() access?

Simple, right?

Multiple Require() can be chained together for more complex rules.

In the end a ReturnCodeWhenDenied() is used to tell the system what to show when it fails. Only one ReturnCodeWhenDenied() is allowed.

Sample usage of Fluent.Backdoor


public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
var options = new RewriteOptions();

var fluent = new BackdoorRule().AllowAnythingFor(2)
    .Require(new BackdoorMagicQuerystring
        QuerystringName = Configuration["FluentBackDoorRules:FluentMagicQuerystring:QuerystringName"],
        QuerystringValue = Configuration["FluentBackDoorRules:FluentMagicQuerystring:QuerystringValue"]
    }).AndAllowFor(new TimeSpan(0, 0, 10))
    .Require(new BackdoorMagicCookie()
        CookieName = Configuration["FluentBackDoorRules:FluentMagicCookie:CookieName"],
        CookieValue = Configuration["FluentBackDoorRules:FluentMagicCookie:CookieValue"]
    .Require(new BackdoorMagicCookie()
        CookieName = "hey",
        CookieValue = "ho"
    }).AndAllowFor(new TimeSpan(0, 0, 20))
    .Require(new BackdoorHttpHostAndRemoteIPAddress
        HostNamesToProtect = Configuration["FluentBackDoorRules:FluentMagicRegExHttpHost_RemoteAddr:HostNamesToProtect"],
        IPAddressesToAllowToUseProtectedUrls = Configuration["FluentBackDoorRules:FluentMagicRegExHttpHost_RemoteAddr:IPAddressesToAllowToUseProtectedUrls"]



  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
  "AllowedHosts": "*",
  "FluentBackDoorRules": {
    "CompleteAccess": {
      "TimeAllowedInSeconds": 20
    "FluentMagicCookie": {
      "CookieName": "cookieshallpass",
      "CookieValue": "xxx"
    "FluentMagicQuerystring": {
      "QuerystringName": "querystringshallpass",
      "QuerystringValue": "xxx"
    "FluentMagicRegExHttpHost_RemoteAddr": {
      "HostNamesToProtect": "inte\\.|prep\\.|-slot\\.|prod\\.|stage\\.|stage2\\.|www2\\.",
      "IPAddressesToAllowToUseProtectedUrls": "^5\\.6\\.7\\8.$"

Explanation of what sample code above will do:

  1. Allow any calls to the app 2 times.
  2. Allow access to the app for 10 seconds if a querystring is supplied.
  3. Allow access to the app for 20 seconds if two different cookies are present.
  4. Restrict access to the app IF the HTTP_HOST contains HostNamesToProtect, IE. the secret app service url:s using RegEx-matching AND the visitor is NOT in the list of IPAddressesToAllowToUseProtectedUrls (REMOTE_ADDR).
Product Compatible and additional computed target framework versions.
.NET net5.0 is compatible.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

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1.0.17 792 6/24/2022
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