req-perform.md
In httr2: Perform HTTP Requests and Process the Responses

curl errors become errors

Code
  req_perform(req)
Condition
  Error in `req_perform()`:
  ! Failed to perform HTTP request.
  Caused by error in `curl_fetch()`:
  ! Failed to connect

http errors become errors

Code
  req_perform(req)
Condition
  Error in `req_perform()`:
  ! HTTP 404 Not Found.

Code
  req_perform(req)
Condition
  Error in `req_perform()`:
  ! HTTP 429 Too Many Requests.

Code
  req_perform(req)
Condition
  Error in `req_perform()`:
  ! HTTP 599.

checks input types

Code
  req_perform(req, path = 1)
Condition
  Error in `req_perform()`:
  ! `path` must be a single string or `NULL`, not the number 1.
Code
  req_perform(req, verbosity = 1.5)
Condition
  Error in `req_perform()`:
  ! `verbosity` must 0, 1, 2, or 3.
Code
  req_perform(req, mock = 7)
Condition
  Error in `req_perform()`:
  ! `mock` must be a function or `NULL`, not the number 7.