#' @section R6 classes:
#' This is an R6 class from the package \pkg{R6}. Find out more
#' about R6 at <https://r6.r-lib.org/>. After creating an instance of an R6
#' class (e.g., `x <- HttpClient$new(url = "https://hb.opencpu.org")`) you can
#' access values and methods on the object `x`.
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