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# ethtool 설치
$ apt install ethtool

# 어탭터와 맥 주소 IP 확인
$ ip addr
root@proxmox:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever

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BigDecimal a = new BigDecimal("0.4");
BigDecimal b = new BigDecimal("0.40");

// 객체의 레퍼런스 주소에 대한 비교 연산자, 무의식적으로 값의 비교를 위해 사용하면 오동작
// false
a == b;

// 값의 비교를 위해 사용, 소수점 맨 끝의 0까지 완전히 값이 동일해야 true 반환
// false
a.equals(b);

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// https://www.baeldung.com/java-stacktrace-to-string
String stacktrace = ExceptionUtils.getStackTrace(e);

// commons-lang3 jar 구현체
public static String getStackTrace(Throwable throwable) {
  StringWriter sw = new StringWriter();
  PrintWriter pw = new PrintWriter(sw, true);
  throwable.printStackTrace(pw);
  return sw.getBuffer().toString();
}

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// https://www.tabnine.com/code/java/methods/org.apache.commons.httpclient.methods.PostMethod/getRequestEntity
((StringRequestEntity)post.getRequestEntity()).getContent();

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// https://stackoverflow.com/questions/11401897/get-the-current-domain-name-with-javascript-not-the-path-etc

function getDomain(url, subdomain) {
    subdomain = subdomain || false;
    url = url.replace(/(https?:\/\/)?(www.)?/i, '');

    if (!subdomain) {
        url = url.split('.');

        url = url.slice(url.length - 2).join('.');

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# http version
$ http --version

# https://stackoverflow.com/questions/37215565/sending-nested-json-object-using-httpie
$ echo '{ "user": { "name": "john", "age": 10 } }' | http httpbin.org/post
$ http PUT localhost:8080/user <<<'{ "user": { "name": "john", "age": 10 }}'

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Nginx location match tester

https://nginx.viraptor.info/

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xstream 1.4.18 이상 부터 권한 문제 이슈 https://stackoverflow.com/questions/30812293/com-thoughtworks-xstream-security-forbiddenclassexception

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https://docs.aws.amazon.com/ko_kr/AWSEC2/latest/UserGuide/putty.html

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https://github.com/rakyll/hey