## Not run: 
x <- HttpClient$new(
  url = "https://httpbin.org",
  opts = list(
    cookie = "c=1;f=5",
    verbose = TRUE
  )
)
x

# set cookies
(res <- x$get("cookies"))
jsonlite::fromJSON(res$parse("UTF-8"))

(x <- HttpClient$new(url = "https://httpbin.org"))
res <- x$get("cookies/set", query = list(foo = 123, bar = "ftw"))
jsonlite::fromJSON(res$parse("UTF-8"))
curl::handle_cookies(handle = res$handle)

# reuse handle
res2 <- x$get("get", query = list(hello = "world"))
jsonlite::fromJSON(res2$parse("UTF-8"))
curl::handle_cookies(handle = res2$handle)

# DOAJ
x <- HttpClient$new(url = "https://doaj.org")
res <- x$get("api/v1/journals/f3f2e7f23d444370ae5f5199f85bc100",
  verbose = TRUE)
res$response_headers$`set-cookie`
curl::handle_cookies(handle = res$handle)
res2 <- x$get("api/v1/journals/9abfb36b06404e8a8566e1a44180bbdc",
  verbose = TRUE)

## reset handle
x$handle_pop()
## cookies no longer sent, as handle reset
res2 <- x$get("api/v1/journals/9abfb36b06404e8a8566e1a44180bbdc",
  verbose = TRUE)

## End(Not run)