GPT-Load

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A high-performance, enterprise-grade AI API transparent proxy service designed specifically for enterprises and developers who need to integrate multiple AI services. Built with Go, featuring intelligent key management, load balancing, and comprehensive monitoring capabilities, designed for high-concurrency production environments.

For detailed documentation, please visit Official Documentation

Features

• Transparent Proxy: Complete preservation of native API formats, supporting OpenAI and Google Gemini among other formats (continuously expanding)
• Intelligent Key Management: High-performance key pool with group-based management, automatic rotation, and failure recovery
• Load Balancing: Weighted load balancing across multiple upstream endpoints to enhance service availability
• Smart Failure Handling: Automatic key blacklist management and recovery mechanisms to ensure service continuity
• Dynamic Configuration: System settings and group configurations support hot-reload without requiring restarts
• Enterprise Architecture: Distributed leader-follower deployment supporting horizontal scaling and high availability
• Modern Management: Vue 3-based web management interface that is intuitive and user-friendly
• Comprehensive Monitoring: Real-time statistics, health checks, and detailed request logging
• High-Performance Design: Zero-copy streaming, connection pool reuse, and atomic operations
• Production Ready: Graceful shutdown, error recovery, and comprehensive security mechanisms

Supported AI Services

GPT-Load serves as a transparent proxy service, completely preserving the native API formats of various AI service providers:

• OpenAI Format: Official OpenAI API, Azure OpenAI, and other OpenAI-compatible services
• Google Gemini Format: Native APIs for Gemini Pro, Gemini Pro Vision, and other models
• Extensibility: Plugin-based architecture design for rapid integration of new AI service providers and their native formats

Quick Start

System Requirements

• Go 1.23+ (for source builds)
• Docker (for containerized deployment)
• MySQL 8.2+ (for database storage)
• Redis (for caching and distributed coordination, optional)

Method 1: Using Docker Compose (Recommended)

Installation Commands:

# Create Directory
mkdir -p gpt-load && cd gpt-load

# Download configuration files
wget https://raw.githubusercontent.com/tbphp/gpt-load/refs/heads/main/docker-compose.yml
wget -O .env https://raw.githubusercontent.com/tbphp/gpt-load/refs/heads/main/.env.example

# Edit configuration file (modify service port and authentication key as needed)
# vim .env

# Start services (includes MySQL and Redis)
docker compose up -d

Other Commands:

# Check service status
docker compose ps

# View logs
docker compose logs -f

# Restart Service
docker compose down && docker compose up -d

# Update to latest version
docker compose pull && docker compose down && docker compose up -d

After deployment:

• Access Web Management Interface: http://localhost:3001
• API Proxy Address: http://localhost:3001/proxy

Use the default authentication key sk-123456 to login to the management interface. The authentication key can be modified via AUTH_KEY in the .env file.

Method 2: Source Build

Source build requires locally installed MySQL and Redis (optional).

# Clone and build
git clone https://github.com/tbphp/gpt-load.git
cd gpt-load
go mod tidy

# Create configuration
cp .env.example .env

# Modify DATABASE_DSN and REDIS_DSN configurations in .env
# REDIS_DSN is optional; if not configured, memory storage will be enabled

# Run
make run

After deployment:

• Access Web Management Interface: http://localhost:3001
• API Proxy Address: http://localhost:3001/proxy

Use the default authentication key sk-123456 to login to the management interface. The authentication key can be modified via AUTH_KEY in the .env file.

Method 3: Cluster Deployment

Cluster deployment requires all nodes to connect to the same MySQL and Redis, with Redis being mandatory. It's recommended to use unified distributed MySQL and Redis clusters.

Deployment Requirements:

• All nodes must configure identical AUTH_KEY, DATABASE_DSN, REDIS_DSN
• Leader-follower architecture where follower nodes must configure environment variable: IS_SLAVE=true

For details, please refer to Cluster Deployment Documentation

Configuration System

Configuration Architecture Overview

GPT-Load adopts a dual-layer configuration architecture:

1. Static Configuration (Environment Variables)

• Characteristics: Read at application startup, immutable during runtime, requires application restart to take effect
• Purpose: Infrastructure configuration such as database connections, server ports, authentication keys, etc.
• Management: Set via .env files or system environment variables

2. Dynamic Configuration (Hot-Reload)

• System Settings: Stored in database, providing unified behavioral standards for the entire application
• Group Configuration: Behavior parameters customized for specific groups, can override system settings
• Configuration Priority: Group Configuration > System Settings
• Characteristics: Supports hot-reload, takes effect immediately after modification without application restart

Static Configuration (Environment Variables)

Server Configuration

Setting	Environment Variable	Default	Description
Service Port	PORT	3001	HTTP server listening port
Service Address	HOST	0.0.0.0	HTTP server binding address
Read Timeout	SERVER_READ_TIMEOUT	60	HTTP server read timeout (seconds)
Write Timeout	SERVER_WRITE_TIMEOUT	600	HTTP server write timeout (seconds)
Idle Timeout	SERVER_IDLE_TIMEOUT	120	HTTP connection idle timeout (seconds)
Graceful Shutdown Timeout	SERVER_GRACEFUL_SHUTDOWN_TIMEOUT	10	Service graceful shutdown wait time (seconds)
Follower Mode	IS_SLAVE	false	Follower node identifier for cluster deployment
Timezone	TZ	Asia/Shanghai	Specify timezone

Authentication & Database Configuration

Setting	Environment Variable	Default	Description
Authentication Key	AUTH_KEY	sk-123456	Unique authentication key for accessing management interface and proxy requests
Database Connection	DATABASE_DSN	-	MySQL database connection string
Redis Connection	REDIS_DSN	-	Redis connection string, uses memory storage when empty

Performance & CORS Configuration

Setting	Environment Variable	Default	Description
Max Concurrent Requests	MAX_CONCURRENT_REQUESTS	100	Maximum concurrent requests allowed by system
Enable CORS	ENABLE_CORS	true	Whether to enable Cross-Origin Resource Sharing
Allowed Origins	ALLOWED_ORIGINS	*	Allowed origins, comma-separated
Allowed Methods	ALLOWED_METHODS	GET,POST,PUT,DELETE,OPTIONS	Allowed HTTP methods
Allowed Headers	ALLOWED_HEADERS	*	Allowed request headers, comma-separated
Allow Credentials	ALLOW_CREDENTIALS	false	Whether to allow sending credentials

Logging Configuration

Setting	Environment Variable	Default	Description
Log Level	LOG_LEVEL	info	Log level: debug, info, warn, error
Log Format	LOG_FORMAT	text	Log format: text, json
Enable File Logging	LOG_ENABLE_FILE	false	Whether to enable file log output
Log File Path	LOG_FILE_PATH	logs/app.log	Log file storage path

Dynamic Configuration (Hot-Reload)

Dynamic configuration is stored in the database and supports real-time modification through the web management interface, taking effect immediately without restart.

Configuration Priority: Group Configuration > System Settings

Basic Settings

Setting	Field Name	Default	Group Override	Description
Project URL	app_url	http://localhost:3001	❌	Project base URL
Log Retention Days	request_log_retention_days	7	❌	Request log retention days, 0 for no cleanup
Log Write Interval	request_log_write_interval_minutes	5	❌	Log write to database cycle (minutes)

Request Settings

Setting	Field Name	Default	Group Override	Description
Request Timeout	request_timeout	600	✅	Forward request complete lifecycle timeout (seconds)
Connection Timeout	connect_timeout	15	✅	Timeout for establishing connection with upstream service (seconds)
Idle Connection Timeout	idle_conn_timeout	120	✅	HTTP client idle connection timeout (seconds)
Response Header Timeout	response_header_timeout	600	✅	Timeout for waiting upstream response headers (seconds)
Max Idle Connections	max_idle_conns	100	✅	Connection pool maximum total idle connections
Max Idle Connections Per Host	max_idle_conns_per_host	50	✅	Maximum idle connections per upstream host

Key Configuration

Setting	Field Name	Default	Group Override	Description
Max Retries	max_retries	3	✅	Maximum retry count using different keys for single request
Blacklist Threshold	blacklist_threshold	3	✅	Number of consecutive failures before key enters blacklist
Key Validation Interval	key_validation_interval_minutes	60	✅	Background scheduled key validation cycle (minutes)
Key Validation Concurrency	key_validation_concurrency	10	✅	Concurrency for background validation of invalid keys
Key Validation Timeout	key_validation_timeout_seconds	20	✅	API request timeout for validating individual keys in background (seconds)

Web Management Interface

Access the management console at: http://localhost:3001 (default address)

Interface Overview

The web management interface provides the following features:

• Dashboard: Real-time statistics and system status overview
• Key Management: Create and configure AI service provider groups, add, delete, and monitor API keys
• Request Logs: Detailed request history and debugging information
• System Settings: Global configuration management and hot-reload

API Usage Guide

Proxy Interface Invocation

GPT-Load routes requests to different AI services through group names. Usage is as follows:

1. Proxy Endpoint Format

http://localhost:3001/proxy/{group_name}/{original_api_path}

• {group_name}: Group name created in the management interface
• {original_api_path}: Maintain complete consistency with original AI service paths

2. Authentication Methods

As a transparent proxy service, GPT-Load completely preserves the native authentication formats of various AI services:

• OpenAI Format: Uses Authorization: Bearer {AUTH_KEY} header authentication
• Gemini Format: Uses URL parameter key={AUTH_KEY} authentication
• Unified Key: All services use the unified key value configured in the AUTH_KEY environment variable

3. OpenAI Interface Example

Assuming a group named openai was created:

Original invocation:

curl -X POST https://api.openai.com/v1/chat/completions \
  -H "Authorization: Bearer sk-your-openai-key" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-4.1-mini", "messages": [{"role": "user", "content": "Hello"}]}'

Proxy invocation:

curl -X POST http://localhost:3001/proxy/openai/v1/chat/completions \
  -H "Authorization: Bearer sk-123456" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-4.1-mini", "messages": [{"role": "user", "content": "Hello"}]}'

Changes required:

• Replace https://api.openai.com with http://localhost:3001/proxy/openai
• Replace original API Key with unified authentication key sk-123456 (default value)

4. Gemini Interface Example

Assuming a group named gemini was created:

Original invocation:

curl -X POST https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-pro:generateContent?key=your-gemini-key \
  -H "Content-Type: application/json" \
  -d '{"contents": [{"parts": [{"text": "Hello"}]}]}'

Proxy invocation:

curl -X POST http://localhost:3001/proxy/gemini/v1beta/models/gemini-2.5-pro:generateContent?key=sk-123456 \
  -H "Content-Type: application/json" \
  -d '{"contents": [{"parts": [{"text": "Hello"}]}]}'

Changes required:

• Replace https://generativelanguage.googleapis.com with http://localhost:3001/proxy/gemini
• Replace key=your-gemini-key in URL parameter with unified authentication key sk-123456 (default value)

5. Supported Interfaces

OpenAI Format:

• /v1/chat/completions - Chat conversations
• /v1/completions - Text completion
• /v1/embeddings - Text embeddings
• /v1/models - Model list
• And all other OpenAI-compatible interfaces

Gemini Format:

• /v1beta/models/*/generateContent - Content generation
• /v1beta/models - Model list
• And all other Gemini native interfaces

6. Client SDK Configuration

OpenAI Python SDK:

from openai import OpenAI

client = OpenAI(
    api_key="sk-123456",  # Use unified authentication key
    base_url="http://localhost:3001/proxy/openai"  # Use proxy endpoint
)

response = client.chat.completions.create(
    model="gpt-4.1-mini",
    messages=[{"role": "user", "content": "Hello"}]
)

Google Gemini SDK (Python):

import google.generativeai as genai

# Configure API key and base URL
genai.configure(
    api_key="sk-123456",  # Use unified authentication key
    client_options={"api_endpoint": "http://localhost:3001/proxy/gemini"}
)

model = genai.GenerativeModel('gemini-2.5-pro')
response = model.generate_content("Hello")

Important Note: As a transparent proxy service, GPT-Load completely preserves the native API formats and authentication methods of various AI services. You only need to replace the endpoint address and use the unified key value for seamless migration.

License

MIT License - see LICENSE file for details.

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