telnetでhttpアクセス

単発小ネタ

# 20240925_telnetでhttpアクセス  
  
## 目的  
- chromeみたいなブラウザとか、curlみたいな専用のクライアントなくても、telnetでhttpできるのって何か面白い！って思う。＃かも。  

## 試験環境準備  
以前の記事で使った環境を使い回しましょう。

https://qiita.com/kubo4ka/items/142573fb8d5bb7fa1eb4

:::note info
vagrantの説明が必要な場合は以下をご確認ください。
:::

https://qiita.com/kubo4ka/items/b731e9255688653b6fb6


これで、tomcatが動作するcentosにアクセスできるようになっているはずです。

## 実施手順
```
vagrant ssh
```

最後にエンター押すとhttpリクエストが送信されます。
```
telnet
open localhost 8080
GET / HTTP/1.1
host: localhost

```
<details><summary>参考ログ</summary>

```
[vagrant@centosstr9 ~]$ telnet
telnet> open localhost 8080
Trying ::1...
Connected to localhost.
Escape character is '^]'.
GET / HTTP/1.1
host: localhost

HTTP/1.1 200
Content-Type: text/html;charset=UTF-8
Transfer-Encoding: chunked
Date: Tue, 24 Sep 2024 22:10:35 GMT

2000



<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <title>Apache Tomcat/9.0.89</title>
        <link href="favicon.ico" rel="icon" type="image/x-icon" />
        <link href="tomcat.css" rel="stylesheet" type="text/css" />
    </head>

    <body>
        <div id="wrapper">
            <div id="navigation" class="curved container">
                <span id="nav-home"><a href="https://tomcat.apache.org/">Home</a></span>
                <span id="nav-hosts"><a href="/docs/">Documentation</a></span>
                <span id="nav-config"><a href="/docs/config/">Configuration</a></span>
                <span id="nav-examples"><a href="/examples/">Examples</a></span>
                <span id="nav-wiki"><a href="https://cwiki.apache.org/confluence/display/TOMCAT/">Wiki</a></span>
                <span id="nav-lists"><a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></span>
                <span id="nav-help"><a href="https://tomcat.apache.org/findhelp.html">Find Help</a></span>
                <br class="separator" />
            </div>
            <div id="asf-box">
                <h1>Apache Tomcat/9.0.89</h1>
            </div>
            <div id="upper" class="curved container">
                <div id="congrats" class="curved container">
                    <h2>If you're seeing this, you've successfully installed Tomcat. Congratulations!</h2>
                </div>
                <div id="notice">
                    <img id="tomcat-logo" src="tomcat.svg" alt="[tomcat logo]" />
                    <div id="tasks">
                        <h3>Recommended Reading:</h3>
                        <h4><a href="/docs/security-howto.html">Security Considerations How-To</a></h4>
                        <h4><a href="/docs/manager-howto.html">Manager Application How-To</a></h4>
                        <h4><a href="/docs/cluster-howto.html">Clustering/Session Replication How-To</a></h4>
                    </div>
                </div>
                <div id="actions">
                    <div class="button">
                        <a class="container shadow" href="/manager/status"><span>Server Status</span></a>
                    </div>
                    <div class="button">
                        <a class="container shadow" href="/manager/html"><span>Manager App</span></a>
                    </div>
                    <div class="button">
                        <a class="container shadow" href="/host-manager/html"><span>Host Manager</span></a>
                    </div>
                </div>
                <br class="separator" />
            </div>
            <div id="middle" class="curved container">
                <h3>Developer Quick Start</h3>
                <div class="col25">
                    <div class="container">
                        <p><a href="/docs/setup.html">Tomcat Setup</a></p>
                        <p><a href="/docs/appdev/">First Web Application</a></p>
                    </div>
                </div>
                <div class="col25">
                    <div class="container">
                        <p><a href="/docs/realm-howto.html">Realms &amp; AAA</a></p>
                        <p><a href="/docs/jndi-datasource-examples-howto.html">JDBC DataSources</a></p>
                    </div>
                </div>
                <div class="col25">
                    <div class="container">
                        <p><a href="/examples/">Examples</a></p>
                    </div>
                </div>
                <div class="col25">
                    <div class="container">
                        <p><a href="https://cwiki.apache.org/confluence/display/TOMCAT/Specifications">Servlet Specifications</a></p>
                        <p><a href="https://cwiki.apache.org/confluence/display/TOMCAT/Tomcat+Versions">Tomcat Versions</a></p>
                    </div>
                </div>
                <br class="separator" />
            </div>
            <div id="lower">
                <div id="low-manage" class="">
                    <div class="curved container">
                        <h3>Managing Tomcat</h3>
                        <p>For security, access to the <a href="/manager/html">manager webapp</a> is restricted.
                        Users are defined in:</p>
                        <pre>$CATALINA_HOME/conf/tomcat-users.xml</pre>
                        <p>In Tomcat 9.0 access to the manager application is split between
                           different users. &nbsp; <a href="/docs/manager-howto.html">Read more...</a></p>
                        <br />
                        <h4><a href="/docs/RELEASE-NOTES.txt">Release Notes</a></h4>
                        <h4><a href="/docs/changelog.html">Changelog</a></h4>
                        <h4><a href="https://tomcat.apache.org/migration.html">Migration Guide</a></h4>
                        <h4><a href="https://tomcat.apache.org/security.html">Security Notices</a></h4>
                    </div>
                </div>
                <div id="low-docs" class="">
                    <div class="curved container">
                        <h3>Documentation</h3>
                        <h4><a href="/docs/">Tomcat 9.0 Documentation</a></h4>
                        <h4><a href="/docs/config/">Tomcat 9.0 Configuration</a></h4>
                        <h4><a href="https://cwiki.apache.org/confluence/display/TOMCAT/">Tomcat Wiki</a></h4>
                        <p>Find additional important configuration information in:</p>
                        <pre>$CATALINA_HOME/RUNNING.txt</pre>
                        <p>Developers may be interested in:</p>
                        <ul>
                            <li><a href="https://tomcat.apache.org/bugreport.html">Tomcat 9.0 Bug Database</a></li>
                            <li><a href="/docs/api/index.html">Tomcat 9.0 JavaDocs</a></li>
                            <li><a href="https://github.com/apache/tomcat/tree/9.0.x">Tomcat 9.0 Git Repository at GitHub</a></li>
                        </ul>
                    </div>
                </div>
                <div id="low-help" class="">
                    <div class="curved container">
                        <h3>Getting Help</h3>
                        <h4><a href="https://tomcat.apache.org/faq/">FAQ</a> and <a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></h4>
                        <p>The following mailing lists are available:</p>
                        <ul>
                            <li id="list-announce"><strong><a href="https://tomcat.apache.org/lists.html#tomcat-announce">tomcat-announce</a><br />
                                Important announcements, releases, security vulnerability notifications. (Low volume).</strong>
                            </li>
                            <li><a href="https://tomcat.apache.org/lists.html#tomcat-users">tomcat-users</a><br />
                                User support and discussion
                            </li>
                            <li><a href="https://tomcat.apache.org/lists.html#taglibs-user">taglibs-user</a><br />
                                User support and discussion for <a href="https://tomcat.apache.org/taglibs/">Apache Taglibs</a>
                            </li>
                            <li><a href="https://tomcat.apache.org/lists.html#tomcat-dev">tomcat-dev</a><br />
                                Development mailing list, including commit messages
                            </li>
                        </ul>
                    </div>
                </div>
                <br class="separator" />
            </div>
            <div id="footer" class="curved container">
                <div class="col20">
                    <div class="container">
                        <h4>Other Downloads</h4>
                        <ul>
                            <li><a href="https://tomcat.apache.org/download-connectors.cgi">Tomcat Connectors</a></li>
                            <li><a href="https://tomcat.apache.org/download-native.cgi">Tomcat Native</a></li>
                            <li><a href="https:/
bca
/tomcat.apache.org/taglibs/">Taglibs</a></li>
                            <li><a href="/docs/deployer-howto.html">Deployer</a></li>
                        </ul>
                    </div>
                </div>
                <div class="col20">
                    <div class="container">
                        <h4>Other Documentation</h4>
                        <ul>
                            <li><a href="https://tomcat.apache.org/connectors-doc/">Tomcat Connectors</a></li>
                            <li><a href="https://tomcat.apache.org/connectors-doc/">mod_jk Documentation</a></li>
                            <li><a href="https://tomcat.apache.org/native-doc/">Tomcat Native</a></li>
                            <li><a href="/docs/deployer-howto.html">Deployer</a></li>
                        </ul>
                    </div>
                </div>
                <div class="col20">
                    <div class="container">
                        <h4>Get Involved</h4>
                        <ul>
                            <li><a href="https://tomcat.apache.org/getinvolved.html">Overview</a></li>
                            <li><a href="https://tomcat.apache.org/source.html">Source Repositories</a></li>
                            <li><a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></li>
                            <li><a href="https://cwiki.apache.org/confluence/display/TOMCAT/">Wiki</a></li>
                        </ul>
                    </div>
                </div>
                <div class="col20">
                    <div class="container">
                        <h4>Miscellaneous</h4>
                        <ul>
                            <li><a href="https://tomcat.apache.org/contact.html">Contact</a></li>
                            <li><a href="https://tomcat.apache.org/legal.html">Legal</a></li>
                            <li><a href="https://www.apache.org/foundation/sponsorship.html">Sponsorship</a></li>
                            <li><a href="https://www.apache.org/foundation/thanks.html">Thanks</a></li>
                        </ul>
                    </div>
                </div>
                <div class="col20">
                    <div class="container">
                        <h4>Apache Software Foundation</h4>
                        <ul>
                            <li><a href="https://tomcat.apache.org/whoweare.html">Who We Are</a></li>
                            <li><a href="https://tomcat.apache.org/heritage.html">Heritage</a></li>
                            <li><a href="https://www.apache.org">Apache Home</a></li>
                            <li><a href="https://tomcat.apache.org/resources.html">Resources</a></li>
                        </ul>
                    </div>
                </div>
                <br class="separator" />
            </div>
            <p class="copyright">Copyright &copy;1999-2024 Apache Software Foundation.  All Rights Reserved</p>
        </div>
    </body>

</html>

0

Connection closed by foreign host.
[vagrant@centosstr9 ~]$

```
</details>


:::note info
そもそもtelnetって何？みたいな場合は以下をご確認ください。
:::

https://qiita.com/kubo4ka/items/abd4323c7b0057be1b20#%E3%83%91%E3%82%B1%E3%83%83%E3%83%88%E3%82%92%E3%82%AD%E3%83%A3%E3%83%97%E3%83%81%E3%83%A3%E3%81%97%E3%81%A6%E3%81%BF%E3%82%88%E3%81%86%E3%81%9D%E3%81%AE%EF%BC%93telnet


以上