Description:

This PR refactors the FastAPI server start-up logic to improve the display of the application’s documentation URLs in the console. It introduces a conditional check for app.openapi_url, ensuring that only defined documentation URLs are printed. The updated logic adds more flexibility to display either docs_url, redoc_url, or both, enhancing visibility for users when serving the API.

Changes:

• Updated import handling with get_import_string_and_app to retrieve both import_string and app for improved compatibility with uvicorn.
• Enhanced serving_str output formatting to conditionally display API documentation URLs based on availability.
• Cleaned up conditional print logic to handle cases where only one or both of docs_url and redoc_url are available.

This adjustment improves user experience by making API documentation links visible and accessible only when they are set.

Examples:
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