What's supported in Harness Feature Flags

Harness Feature Flags support client-side and server-side SDKs for a number of programming languages.

Supported client-side SDKs

The following table lists the client-side Feature Flag SDKs that Harness supports.

SDK	Documentation
Android	Android SDK Reference
iOS	iOS SDK Reference
Flutter	Flutter SDK Reference
Javascript	Javascript SDK Reference
React Native	React Native SDK Reference
Xamarin	Xamarin SDK Reference
React Client	React Client Reference
React Native	React Native Reference

Supported server-side SDKs

The following table lists the server-side Feature Flag SDKs that Harness supports.

SDK	Documentation
.NET	.NET SDK Reference
Go	Go SDK Reference
Java	Java SDK Reference
Node.js	Node.js SDK Reference
Python	Python SDK Reference
Ruby	Ruby SDK Reference
Apex	Apex SDK Reference
Erlang	Erlang SDK Reference
PHP	PHP SDK Reference

Relay Proxy

The Relay Proxy, which allows for offline and hybrid Feature Flags usage, is provided as a Docker image and can be used in any environment where the Docker image can be run. The Relay Proxy can be enhanced with Redis as a cache in environments where this is possible.

Hybrid and offline usage

Harness Feature Flags allows for both completely offline usage as well as hybrid usage via the relay proxy. Hybrid usage can be in the form of:

• The application is online and only talks to the Relay Proxy, while the Relay Proxy has connectivity to Harness.
• The Relay Proxy is bundled with the application at build-time with a working configuration file, and neither the application nor the Relay Proxy have connectivity to Harness.

Cloud limitations

There are no limitations for using Feature Flags in any cloud or non-cloud environment as long as the languages needed are supported with an SDK, and connectivity to either Harness or the Relay Proxy can be established.

For information about what's supported for other Harness modules and the Harness Platform overall, go to Supported platforms and technologies.