Capture 4xx and 5xx errors as errors with cURL

curl-error-handling.sh

#! /bin/bash

# --fail: exit with 22 for an HTTP error response
# --show-error: write a message to stderr on failure, even with --silent
# --silent: don't show progress or errors
# -i: include headers in output
curl --fail --show-error --silent -i http://httpstat.us/"$1" 1>/dev/null
if [[ $? != 0 ]] ; then
    echo "error"
    exit 1
fi
echo "worked"

Short for curl -fSsi http://httpstat.us/200