assert_url function

Assert Existence of URL

Assert that a Uniform Resource Locator (URL) is complete and valid. Requires that the httr package is available.

Source

Code adapted from Stack Overflow, accessed on 2023-12-11 and authored by Bob Rudis.

assert_url(url, ...)

Arguments

• url: 'character' string. URL
• ...: Other arguments passed to the httr::HEAD and httr::GET functions.

Returns

Returns url invisibly. A NULL value is returned if the assertion fails for any reason.

Examples

assert_url("https://www.usgs.gov/")