Cloudflare.ForwardedHeaders 1.0.0

.NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher. 
dotnet add package Cloudflare.ForwardedHeaders --version 1.0.0
                    


                    

                
NuGet\Install-Package Cloudflare.ForwardedHeaders -Version 1.0.0
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="Cloudflare.ForwardedHeaders" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Cloudflare.ForwardedHeaders" Version="1.0.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Cloudflare.ForwardedHeaders" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Cloudflare.ForwardedHeaders --version 1.0.0
                    


                    

                
#r "nuget: Cloudflare.ForwardedHeaders, 1.0.0"
#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. 
#:package Cloudflare.ForwardedHeaders@1.0.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Cloudflare.ForwardedHeaders&version=1.0.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Cloudflare.ForwardedHeaders&version=1.0.0
                    


                            Install as a Cake Tool

Cloudflare.ForwardedHeaders

Repository: github.com/orkunucan/Cloudflare.ForwardedHeaders.Automated

NuGet package for ASP.NET Core that downloads Cloudflare IP ranges (IPv4 and IPv6) and applies them to ForwardedHeadersOptions.KnownNetworks, so UseForwardedHeaders() trusts Cloudflare edge addresses when processing X-Forwarded-* headers.

  • Target: netstandard2.0 (ASP.NET Core 2.2+ and modern .NET).
  • Startup: Fetches https://www.cloudflare.com/ips-v4 and https://www.cloudflare.com/ips-v6 with a configurable timeout.
  • Fallback: If the network is unavailable, an embedded snapshot of CIDR lines is used.
  • Optional refresh: RefreshInterval enables a background service that periodically refreshes KnownNetworks.

Installation

dotnet add package Cloudflare.ForwardedHeaders

Usage

In Program.cs or Startup.ConfigureServices:

using Cloudflare.ForwardedHeaders;

services.AddCloudflareForwardedHeaders(options =>
{
    options.FetchTimeout = TimeSpan.FromSeconds(10);
    options.RefreshInterval = TimeSpan.FromHours(24); // omit or null to disable background refresh
});

In the HTTP pipeline (before other middleware that depends on HttpContext.Connection or scheme):

app.UseForwardedHeaders();

The package registers ForwardedHeadersOptions (required for UseForwardedHeaders()), sets ForwardedHeaders to X-Forwarded-For and X-Forwarded-Proto by default, and populates KnownNetworks from Cloudflare CIDRs.

Notes

  • Microsoft.AspNetCore.HttpOverrides 2.x does not provide IServiceCollection.AddForwardedHeaders(). This library registers ForwardedHeadersOptions via services.Configure<ForwardedHeadersOptions>(...), which is sufficient for UseForwardedHeaders().
  • Thread safety: Updates to KnownNetworks use a shared lock so startup configuration and the optional background refresher do not race with request handling.

Building the package

dotnet pack src/Cloudflare.ForwardedHeaders/Cloudflare.ForwardedHeaders.csproj -c Release

License

MIT

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  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.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.0.0 109 4/21/2026