github.com/thomaspoignant/go-feature-flag (go): Package ffclient aids adding instrumentation to have feature flags in your app without any backend server.  This package and its subpackages contain bits of code to have an easy feature flag solution with no complex installation to do on your infrastructure and without using 3rd party vendor for this.  The ffclient package provides the entry point - initialization and the basic method to get your flags value.  Before using the module you need to initialized it this way:  This example will load a file from an HTTP endpoint and will refresh the flags every 3 seconds.  Now you can evalute your flags anywhere in your code.
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