> ## Documentation Index
> Fetch the complete documentation index at: https://developers.authlete.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authlete 2.2 Release Notes - HOTFIX (February 2021)

##### Version Number : 2.2.3

# Overview of This Release

This is a minor update of Authlete 2.2. It includes the following new or enhanced features since the version 2.2.2.

# Newly Supported Standard Specifications

N/A

# Added or Updated APIs

## Echo API

The Echo API ( `/misc/echo`) is a new feature for health check purposes. It converts query parameters into a JSON object and returns the JSON.