To cite package ‘servr’ in publications use:

  Xie Y (2024). _servr: A Simple HTTP Server to Serve Static Files or
  Dynamic Documents_. R package version 0.31.1,
  <https://github.com/yihui/servr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {servr: A Simple HTTP Server to Serve Static Files or Dynamic Documents},
    author = {Yihui Xie},
    year = {2024},
    note = {R package version 0.31.1},
    url = {https://github.com/yihui/servr},
  }