curl_fail_option.md

CURL fail option

$ curl -f "http://localhost/force_error.php" > /dev/null 2>&1 && echo Success || echo Fail
$ Fail

$ curl "http://localhost/force_error.php" > /dev/null 2>&1 && echo Success || echo Fail
$ Success 

force_error.php

<?php
http_response_code(500);
exit(1);

TestCurlProcess.java

public class TestCurlProcess {

    public static void main(String... args) throws Exception {
        System.out.println("'-f' option exit code : " + execute("curl -f http://www.404.site")); // 6
        System.out.println("no option exit code : " + execute("curl http://www.404.site")); // 6
        System.out.println("-f option exit code : " + execute("curl -f http://localhost/force_error.php")); // 22
        System.out.println("no option exit code : " + execute("curl http://localhost/force_error.php")); // 0
    }

    private static Integer execute(String cmd) throws Exception {
        Process process = Runtime.getRuntime().exec(cmd, null);
        Integer exitCode;
        while (true) {
            if (!process.isAlive()) {
                exitCode = process.exitValue();
                break;
            }
            Thread.sleep(100);
        }
        return exitCode;
    }
}