in my package, there is a function calling a https-address.

I am checking with curl::has_internet() for an internet connection and with httr::http_error() for http-errors.

My problem is:

if this function gets an invalid URL, like https://foobarfoo.bar, the function dies with 'Couldn't resolve host name'

My question is:

is there a way to keep the function alive, throwing "NA" or something instead of dying? E.g. is there a way to "safely" test for the host name before executing my function?

CodePudding user response：

You can use the tryCatch function with the error argument to solve this issue:

tryCatch(curl::nslookup("foobardodod.fd"), error = function(e) NA)

returns

#> NA

as defined in error, if curl::nslookup("foobardodod.fd") fails.