Worked on the koreader/koreader repository to address a bug in the OPDS download pipeline, focusing on improving the decoding of server-provided filenames that arrive in URL-encoded formats. Applied robust string handling and URL decoding techniques using Lua to ensure that filenames are parsed correctly, which stabilized the download process and prevented issues with misnamed files. This backend development effort enhanced the reliability of OPDS downloads, resulting in fewer user-facing errors and reducing support requests related to file naming. The work demonstrated careful integration with the existing OPDS workflow and contributed to the overall code quality and maintainability of the project.