Document use of curl::form_data in POST

[kent37]

Since c8f7a69 fixed #430, the body parameter of httr::POST may contain form elements created with curl::form_data. Unfortunately this is not mentioned in the documentation for POST. I suggest changing the help text at

httr/R/http-post.r

Lines 22 to 23 in cb4e20c

	#' For "multipart", list elements can be strings or objects created by
	#' [upload_file()]. For "form", elements are coerced to strings

to

#'   For "multipart", list elements can be strings or objects created by
#'   [upload_file()] or [curl::form_data()]. For "form", elements are coerced to strings

to make it easier to discover this useful functionality. Thank you!

[hadley]

httr has been superseded in favour of httr2, so is no longer under active development. If this problem is still important to you in httr2, I'd suggest filing an issue offer there 😄 (but it looks like it's already documented). Thanks for using httr!