HttpGemini – Gemini API Plugin for Unreal Engine

Bring Conversational AI to Unreal Engine with HttpGemini

A lightweight, powerful, and Blueprint-ready plugin to connect your projects with Google’s Gemini API at runtime. No C++ required.

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Powerful, Simple, Integrated

All the tools you need to build next-generation NPCs and intelligent systems.

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100% Blueprint Ready

Access all functionality through a single, easy-to-use asynchronous node. Perfect for designers and artists.

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Runtime Communication

Send prompts and receive AI-generated responses live in your packaged game or application.

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Easy Configuration

Simply set your API Key and Gemini Model in the Project Settings. No code changes needed.

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Asynchronous by Design

API requests are non-blocking, ensuring your game’s performance remains smooth with no freezes or hitches.

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Robust Error Handling

Get clear, actionable feedback on connection issues or invalid API keys directly in your Blueprints.

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No External Dependencies

Self-contained and built using Unreal’s native modules for maximum stability and compatibility.

Simple, Fast, and Powerful

Get up and running in just a few minutes with our intuitive workflow.

Install & Enable

Add the plugin to your project and enable it in the Plugins window.

Configure Settings

Go to Project Settings and paste in your API Key.

Use in Blueprint

Call the `SendChatMessage` node and handle the response with a Custom Event.

Technical Specifications

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Supported Engine Versions: 5.5, 5.6 & up
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Supported Platforms: Windows (64-bit), Android

Important Requirements

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Valid API Key: A key from the Google AI platform is required. (Follow our 1-minute guide)
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Internet Connection: Required at runtime to communicate with the API.

Troubleshooting

Common questions and solutions.

Error: `API Key not set`

Cause: The API Key field in the Project Settings is empty.
Solution: Navigate to `Project Settings > Plugins > HttpGemini` and enter your valid API key.

Error: `HTTP request failed`

Cause: A problem connecting to Google’s servers. This can be due to a lack of internet, a firewall, or an invalid/disabled API key.
Solution: Check your internet connection and ensure your API key is correct. A `4xx` response code indicates a problem with your request/key, while `5xx` indicates a server-side issue with Google’s API.

Error: `Could not parse response` or the response is empty

Cause: The API returned an unexpected response structure. This most commonly happens if the **Model** selected in Project Settings is incorrect or unavailable.
Solution: Double-check the Gemini Model selected in the plugin settings to ensure it is valid (e.g., `Gemini 1.5 Flash`).