The curl() and curl_download() functions provide highly
    configurable drop-in replacements for base url() and download.file() with
    better performance, support for encryption (https, ftps), gzip compression,
    authentication, and other 'libcurl' goodies. The core of the package implements a
    framework for performing fully customized requests where data can be processed
    either in memory, on disk, or streaming via the callback or connection
    interfaces. Some knowledge of 'libcurl' is recommended; for a more-user-friendly
    web client see the 'httr' package which builds on this package with http
    specific tools and logic.

libcurl: libcurl-devel (rpm) or
libcurl4-openssl-dev (deb).

spelling, testthat (>= 1.0.0), knitr, jsonlite, rmarkdown,
magrittr, httpuv (>= 1.4.4), webutils

Jeroen Ooms [aut, cre] (<https://orcid.org/0000-0002-4035-0289>),
  Hadley Wickham [ctb],
  RStudio [cph]

ANSI Control Sequence Aware String Functions

Counterparts to R string manipulation functions that account for
   the effects of ANSI text formatting control sequences.

c(
    person("Brodie", "Gaslam", email="brodie.gaslam@yahoo.com",
    role=c("aut", "cre")),
    person("Elliott", "Sales De Andrade", role="ctb"),
    person(family="R Core Team",
    email="R-core@r-project.org", role="cph",
    comment="UTF8 byte length calcs from src/util.c"
    ))

'constants.R' 'fansi-package.R' 'internal.R' 'load.R' 'misc.R'
'nchar.R' 'strwrap.R' 'strtrim.R' 'strsplit.R' 'substr2.R'
'trimws.R' 'tohtml.R' 'unhandled.R' 'normalize.R' 'sgr.R'

Brodie Gaslam [aut, cre],
  Elliott Sales De Andrade [ctb],
  R Core Team [cph] (UTF8 byte length calcs from src/util.c)

Dirk Eddelbuettel, Romain Francois, JJ Allaire, Kevin Ushey, Qiang Kou,
 Nathan Russell, Inaki Ucar, Douglas Bates and John Chambers

The 'Rcpp' package provides R functions as well as C++ classes which
 offer a seamless integration of R and C++. Many R data types and objects can be
 mapped back and forth to C++ equivalents which facilitates both writing of new
 code as well as easier integration of third-party libraries. Documentation
 about 'Rcpp' is provided by several vignettes included in this package, via the
 'Rcpp Gallery' site at <https://gallery.rcpp.org>, the paper by Eddelbuettel and
 Francois (2011, <doi:10.18637/jss.v040.i08>), the book by Eddelbuettel (2013,
 <doi:10.1007/978-1-4614-6868-4>) and the paper by Eddelbuettel and Balamuta (2018,
 <doi:10.1080/00031305.2017.1375990>); see 'citation("Rcpp")' for details.