Downloads one file at a time with httr — cas_download

Mostly used internally by cas_download.

Usage

cas_download_httr(
  download_df = NULL,
  index = FALSE,
  index_group = NULL,
  overwrite_file = FALSE,
  wait = 1,
  create_folder_if_missing = NULL,
  pause_base = 2,
  pause_cap = 256,
  pause_min = 4,
  terminate_on = 404,
  retry_times = 16,
  db_connection = NULL,
  disconnect_db = FALSE,
  sample = FALSE,
  file_format = "html",
  user_agent = NULL,
  download_again_if_status_is_not = NULL,
  ...
)

Arguments

download_df: A data frame with four columns: id, url, path, type.
index: Logical, defaults to FALSE. If TRUE, downloaded files will be considered index files. If not, they will be considered contents files. See Readme for a more extensive explanation.
overwrite_file: Logical, defaults to FALSE.
wait: Defaults to 1. Number of seconds to wait between downloading one page and the next. Can be increased to reduce server load, or can be set to 0 when this is not an issue.
retry_times: Defaults to 10. Number of times to retry download in case of errors.
db_connection: Defaults to NULL. If NULL, uses local SQLite database. If given, must be a connection object or a list with relevant connection settings (see example).
disconnect_db: Defaults to TRUE. If FALSE, leaves the connection to database open.
sample: Defaults to FALSE. If TRUE, the download order is randomised. If a numeric is given, the download order is randomised and at most the given number of items is downloaded.
user_agent: Defaults to NULL. If given, passed to download method.
...: Passed to cas_get_db_file().

Value

Invisibly returns the full httr response.