If you are looking for an informative guide on how to download .txt files or manage files via HTTP, there are several methods depending on whether you are a general user or a developer.
By default, most web browsers (Chrome, Firefox, Safari) will open a .txt link directly in the window rather than downloading it.
: If the file is on Google Drive, tap the "More" icon (three dots) next to the file name and select Download . Download a file - Computer - Google Chrome Help