The LangGraph-GUI Backend is an open-source FastAPI service that powers the LangGraph graphical interface. It handles CRUD operations on graph nodes and edges, manages workflow execution against various language models, and returns real-time inference results. The backend supports authentication, logging, and extensibility for custom plugins, enabling users to prototype, test, and deploy complex natural language processing workflows through a visual programming paradigm while maintaining full control over execution pipelines.

HTTPie is a versatile API testing client designed for simplicity and ease-of-use. It offers a modern, user-friendly interface that supports both command-line and desktop environments. With features like built-in JSON support, syntax highlighting, and authentication, it streamlines the process of interacting with various APIs. HTTPie is perfect for developers who need a reliable tool to test REST, GraphQL, and HTTP APIs quickly and efficiently.