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#' Preserve cookies across requests
#'
#' By default, httr2 uses a clean slate for every request meaning that cookies
#' are not automatically preserved across requests. To preserve cookies, you
#' must set a cookie file which will be read before and updated after each
#' request.
#'
#' @inheritParams req_perform
#' @param path A path to a file where cookies will be read from before and updated after the request.
#' @export
#' @examples
#' path <- tempfile()
#' httpbin <- request(example_url()) |>
#' req_cookie_preserve(path)
#'
#' # Manually set two cookies
#' httpbin |>
#' req_template("/cookies/set/:name/:value", name = "chocolate", value = "chip") |>
#' req_perform() |>
#' resp_body_json()
#'
#' httpbin |>
#' req_template("/cookies/set/:name/:value", name = "oatmeal", value = "raisin") |>
#' req_perform() |>
#' resp_body_json()
#'
#' # The cookie path has a straightforward format
#' cat(readChar(path, nchars = 1e4))
req_cookie_preserve <- function(req, path) {
check_request(req)
check_string(path, allow_empty = FALSE)
req_options(req,
cookiejar = path,
cookiefile = path
)
}
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