test_url: test whether a url can be accessed

In dongzhuoer/rget: fetch contents of a website

Description

test whether a url can be accessed

Usage

test_url(url)

Arguments

url

string.

Value

logical scalar.

example

test_url('www.cookbook-r.com') test_url('www.cookbook-r.com/Graphs2') # not exist test_url('www.cookbook-r.com/Data_input_and_output/Loading_data_from_a_file/datafile.csv') test_url('yihui.name') test_url('www.cosx.org') test_url('www.baidu.com') test_url('www.github.com') test_url('www.google.com') # of course fails and takes several seconds

dongzhuoer/rget documentation built on July 29, 2020, 1:45 p.m.