rvest:：submit_form（）-类型为'；外部PTR'；不可再附加

我正试图通过rvest提交表单，但在最后的

submit\u form（）

步骤中遇到了问题

问题是有点难显示可复制，因为它隐藏在密码后面。我不确定最好的方式来表明这一点，但这里是一般的要点

我可以使用以下方法获得表格

library(rvest)
library(dplyr)

url <- "http://probabilistic-footy.monash.edu/~footy/cgi-bin/presentTips.cgi.pl"
  
params <- list(
    name = user,
    passwd = pass,
    round = 8,
    comp = "normal")

sess <- httr::POST(present_tips_url, body = params,
                   encode = "form")

5: stopifnot(is.request(req), inherits(handle, "curl_handle"))
4: request_perform(req, hu$handle$handle)
3: httr::POST(url, x$config, ..., handle = x$handle)
2: request_POST(session, url = url, body = request$values, encode = request$encode, 
       ...)
1: submit_form(sess, form_unfilled)

但是，当我尝试使用

submit\u form

提交此表单时，我得到以下错误

submit_form(sess, form_filled)
#> Submitting with '.submit'
#> Error: object of type 'externalptr' is not subsettable

我还尝试根据一些其他问题更新

.submit

字段的类型和值，但这没有帮助。我也尝试过提交原始的未填写表单，但我得到了相同的错误

form_filled$fields$.submit$type <- "submit"
form_filled$fields$.submit$value <- url
submit_form(sess, form_filled)
#> Submitting with '.submit'
#> Error: object of type 'externalptr' is not subsettable

submit_form(sess, form_unfilled)
#> Submitting with '.submit'
#> Error: object of type 'externalptr' is not subsettable

有人能告诉我一个我可以在这里尝试的方向吗？我想知道这是否是因为单选按钮字段（例如，

game1

）重复出现，但我无法找到删除它们的方法

submit_form(sess, form_filled)
#> Submitting with '.submit'
#> Error: object of type 'externalptr' is not subsettable

form_filled$fields$.submit$type <- "submit"
form_filled$fields$.submit$value <- url
submit_form(sess, form_filled)
#> Submitting with '.submit'
#> Error: object of type 'externalptr' is not subsettable

submit_form(sess, form_unfilled)
#> Submitting with '.submit'
#> Error: object of type 'externalptr' is not subsettable

5: stopifnot(is.request(req), inherits(handle, "curl_handle"))
4: request_perform(req, hu$handle$handle)
3: httr::POST(url, x$config, ..., handle = x$handle)
2: request_POST(session, url = url, body = request$values, encode = request$encode, 
       ...)
1: submit_form(sess, form_unfilled)