【R】no applicable method for 'xml_find_all' applied to an object of class "xml_document"

源码：

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# 安装依赖包 if (!require(rvest)) {   install.packages("rvest") }   if (!require(xml2)) {   install.packages("xml2") }   # 引入 library(rvest)   # 正文 stock_code <- "000616" year_code <- "2018" season_code <- "1"     url <-   paste(     "http://quotes.money.164.com/trade/lsjysj_",     stock_code,     ".html?year=",     year_code,     "&season=",     season_code,     sep = ""   )   web_page <- read_html(url) web_table <- html_table(web_page,                         header = TRUE,                         trim = TRUE,                         fill = TRUE)

提示：

no applicable method for 'xml_find_all' applied to an object of class "xml_document"

原因：

所要爬取的这个页面，将爬虫相关的方法禁用了。所以爬下来的是一个空的“xml_document”文档，无法进行后续的解析。