set_cookies, add_headers or
authenticate. To use this function effectively requires
some knowledge of CURL, and CURL options. Use httr_options to
see a complete list of available options. To see the libcurl documentation
for a given option, use curl_docs.config(...)set_config to set global config defaults, and
with_config to temporarily run code with set options.Other config: add_headers;
authenticate; set_cookies;
timeout; use_proxy;
user_agent; verbose
Other ways to set configuration: reset_config,
set_config; with_config,
with_verbose