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LaunchDarkly EventSource SSE Client for .NET

NuGet CircleCI Documentation


The LaunchDarkly.EventSource package allows .NET developers to consume Server-Sent-Events (SSE) from a remote API. The SSE specification is defined here:

Supported .NET versions

This version of the library is built for the following targets:

  • .NET Framework 4.5.2: runs on .NET Framework 4.5.x and above.
  • .NET Core 2.1: runs on .NET Core 2.x and 3.x, or .NET 5. This target provides an adapter to the standard .NET Core logging framework, Logs.CoreLogging, which is not available in .NET Framework.
  • .NET Standard 2.0: runs on .NET Core 2.x and 3.x or .NET 5, or within a library that is targeted to .NET Standard 2.x.

The .NET build tools should automatically load the most appropriate build of the library for whatever platform your application or library is targeted to.


The published version of this assembly is digitally signed with Authenticode and strong-named. Building the code locally in the default Debug configuration does not use strong-naming and does not require a key file. The public key file is in this repository at as well as here:

Public key (hash algorithm: sha1):

Public key token is 18e8c36453e3060f


We encourage pull requests and other contributions from the community. Check out our contributing guidelines for instructions on how to contribute to this project.

About LaunchDarkly

  • LaunchDarkly is a continuous delivery platform that provides feature flags as a service and allows developers to iterate quickly and safely. We allow you to easily flag your features and manage them from the LaunchDarkly dashboard. With LaunchDarkly, you can:
    • Roll out a new feature to a subset of your users (like a group of users who opt-in to a beta tester group), gathering feedback and bug reports from real-world use cases.
    • Gradually roll out a feature to an increasing percentage of users, and track the effect that the feature has on key metrics (for instance, how likely is a user to complete a purchase if they have feature A versus feature B?).
    • Turn off a feature that you realize is causing performance problems in production, without needing to re-deploy, or even restart the application with a changed configuration file.
    • Grant access to certain features based on user attributes, like payment plan (eg: users on the gold plan get access to more features than users in the silver plan). Disable parts of your application to facilitate maintenance, without taking everything offline.
  • LaunchDarkly provides feature flag SDKs for a wide variety of languages and technologies. Check out our documentation for a complete list.
  • Explore LaunchDarkly
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