Overview

This documentation covers the backend_api.py module in the GPT4Free project, which serves as the core backend API handler for the web interface. It provides endpoints for interacting with language models, managing files, handling conversations, and processing media.

API Endpoints

Models and Providers

Get Available Models

GET /backend-api/v2/models

Returns a list of all available models with their capabilities (image, vision, audio, video) and compatible providers.

Get Provider-Specific Models

GET /backend-api/v2/models/<provider>

Returns models available for a specific provider.

Get Available Providers

GET /backend-api/v2/providers

Returns a list of all available providers with their capabilities and authentication requirements.

Get Version Information

GET /backend-api/v2/version

Returns current and latest version information.

Conversation Handling

Create Conversation

POST /backend-api/v2/conversation

Handles conversation requests and streams responses. Supports text, images, and other media.

Request Body:

{
    "model": "gpt-3.5-turbo",
    "provider": "OpenAI",
    "messages": [
        {"role": "user", "content": "Hello, how are you?"}
    ],
    "download_media": true
}

Quick Create

GET /backend-api/v2/create

Creates a simple conversation with optional web search integration.

Query Parameters:

  • model: Model to use
  • prompt: User prompt
  • provider: Provider to use
  • web_search: Enable web search (true/false or search query)
  • filter_markdown: Filter markdown in response

Log Usage

POST /backend-api/v2/usage

Logs usage data for analytics.

Log Events

POST /backend-api/v2/log

Logs client-side events.

File Management

Manage File Buckets

GET/DELETE /backend-api/v2/files/<bucket_id>

Retrieves or deletes file buckets.

Upload Files

POST /backend-api/v2/files/<bucket_id>

Uploads files to a bucket. Supports various file types including documents and media.

Get Media Files

GET /files/<bucket_id>/media/<filename>

Retrieves media files from a bucket.

Search Media

GET /search/<search>

Searches for media files based on search terms.

Upload Cookies

POST /backend-api/v2/upload_cookies

Uploads cookie files for authentication with providers.

Chat Sharing

Get Shared Chat

GET /backend-api/v2/chat/<share_id>

Retrieves a shared chat by ID.

Save/Update Shared Chat

POST /backend-api/v2/chat/<share_id>

Uploads or updates a shared chat.

Memory Management

Add Memory Items

POST /backend-api/v2/memory/<user_id>

Adds memory items for a user.

Get Memory Items

GET /backend-api/v2/memory/<user_id>

Retrieves memory items for a user with optional search and filtering.

Media Handling

Serve Images

GET /images/<path:name>
GET /media/<path:name>

Serves image and media files.

Audio Synthesis

GET /backend-api/v2/synthesize/<provider>

Handles audio synthesis requests for text-to-speech functionality.

Usage Examples

Basic Conversation

// Example using fetch API
fetch('/backend-api/v2/conversation', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model: 'gpt-3.5-turbo',
    provider: 'OpenAI',
    messages: [
      {role: 'user', content: 'What is artificial intelligence?'}
    ]
  })
})
.then(response => {
  // Handle streaming response
  const reader = response.body.getReader();
  // Process chunks...
})

File Upload

// Example using FormData
const formData = new FormData();
formData.append('files', fileObject);

fetch('/backend-api/v2/files/my-bucket', {
  method: 'POST',
  body: formData
})
.then(response => response.json())
.then(data => console.log(data));

Using Web Search

fetch('/backend-api/v2/create?model=gpt-3.5-turbo&prompt=Latest news about AI&web_search=true', {
  method: 'GET'
})
.then(response => {
  // Handle streaming response with web search results
})

Response Formats

The API uses a consistent JSON format for responses with a type field indicating the kind of response:

  • content: Text content from the model
  • provider: Information about the selected provider
  • conversation: Conversation state
  • preview: Preview of content
  • error: Error information
  • auth: Authentication requirements
  • parameters: Model parameters
  • finish: Finish reason
  • usage: Token usage information
  • reasoning: Reasoning process
  • suggestions: Suggested follow-up questions
  • log: Debug logs

Notes

  • The API supports streaming responses for real-time interaction
  • File uploads can be automatically converted to markdown if MarkItDown is available
  • Media files are stored in a dedicated directory structure with caching
  • Web search functionality enhances responses with real-world information
  • The system includes caching mechanisms for improved performance

This documentation provides an overview of the main functionality in the Backend API. For more detailed information, refer to the code or reach out to the development team.

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