问题
I am having real difficulty with the rvest package in R. I am trying to navigate to a particular webpage after hitting an "I Agree" button on the first webpage. Here's the link to the webpage that I begin with. The code below attempts to obtain the next webpage which has a form to fill out in order to obtain data that I will need to extract.
url <- "http://wonder.cdc.gov/mcd-icd10.html"
pgsession <- html_session(url)
pgform <- html_form(pgsession)[[3]]
new_session <- html_session(submit_form(pgsession,pgform)$url)
pgform_new <- html_form(new_session)
The last line does not obtain the html form for the next webpage and gives me the following error in R.
Error in read_xml.response(x$response, ..., as_html = as_html) :
server error: (500) Internal Server Error
Would very much appreciate any help that I can get with this in both getting to the next webpage and also submitting a form to obtain data. Thanks so much for your time!
来源：https://stackoverflow.com/questions/39779004/having-difficulty-navigating-webpages-using-rvest-package