How I ran a Telegram bot in a browser without rewriting its handlers

The author shares their experience in adapting an existing Telegram bot built with the python-telegram-bot library to run in a standard web browser. The primary challenge was the need to maintain a unified handler logic for both the messenger and the web interface without duplicating code. Instead of creating a separate HTTP API or using Telegram Web Apps, the author developed a solution where the browser mimics Telegram interaction, and a custom transport layer translates requests into standard Update objects. This allows the use of the native Application.process_update() method, keeping the original business logic intact. The article details the prototype's architecture, key technical constraints, and the challenges encountered during implementation and testing. This approach enables developers to significantly simplify the maintenance of cross-platform bots while ensuring code cleanliness and avoiding redundant functionality.