---
title: Agent - 2.0.0
slug: feature-experimentation/release-notes/agent-2-0-0
docTags: 
createdAt: 2026-07-20T15:44:45.802Z
---

## \[2.0.0] - August 27, 2020

\- Add SDK key validation configuration
\- Reject request with invalid host (excluding port)
\- Block content type other than application/json
\- Introducing support for authenticated datafiles

### Breaking Changes

\- Reject requests with invalid hosts, and introduce `server.allowedHosts` configuration property
\- Agent will now reject the request if the content-type is not specified from the clients
\- Add Host as a configurable item
\- Previously, Agent was listening on all interfaces, and did not allow configuring the network interface that it listens on. NewServer allowed specification of a port to listen on, but not an address.
\- Now, we have added configurable HOST, with the default value set to the localhost (127.0.0.1)
\- If there is a need to deploy Agent in docker, then the Host needs to be set to 0.0.0.0. This can be achieved by setting variable `OPTIMIZELY_SERVER_HOST=0.0.0.0`, or setting `server.host` to 0.0.0.0 in config file.

[https://github.com/optimizely/agent/releases/tag/v2.0.0](https://github.com/optimizely/agent/releases/tag/v2.0.0)