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You will need your API URL and your API token in order to connect the Client SDK to you Unleash instance. You can find this information in the “Admin” section Unleash management UI. Read more

1. Install unleash-client-go

To install the latest version of the client use:

go get

If you are still using Unleash Server v2.x.x, then you should use:

go get

2. Initialize unleash

The easiest way to get started with Unleash is to initialize it early in your application code:

import (

func init() {
unleash.WithCustomHeaders(http.Header{"Authorization": {"<API token>"}}),

3. Use unleash

After you have initialized the unleash-client you can easily check if a feature toggle is enabled or not.


4. Stop unleash

To shut down the client (turn off the polling) you can simply call the destroy-method. This is typically not required.


Built-in activation strategies

The Go client comes with implementations for the built-in activation strategies provided by unleash.

  • DefaultStrategy
  • UserIdStrategy
  • FlexibleRolloutStrategy
  • GradualRolloutUserIdStrategy
  • GradualRolloutSessionIdStrategy
  • GradualRolloutRandomStrategy
  • RemoteAddressStrategy
  • ApplicationHostnameStrategy

Read more about the strategies in the activation strategies document.

Unleash context

In order to use some of the common activation strategies you must provide an Unleash context. This client SDK allows you to send in the unleash context as part of the isEnabled call:

ctx := context.Context{
UserId: "123",
SessionId: "some-session-id",
RemoteAddress: "",

unleash.IsEnabled("someToggle", unleash.WithContext(ctx))