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。
vagrantの説明が必要な場合は以下をご確認ください。
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
参考ログ
[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 & 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>$CATALINA_HOME/conf/tomcat-users.xml</pre>
<p>In Tomcat 9.0 access to the manager application is split between
different users. <a href="/docs/manager-howto.html">Read more...</a></p>
<br />
<h4><a href="/docs/RELEASE-NOTES.txt">Release Notes</a></h4>
<h4><a href="/docs/changelog.html">Changelog</a></h4>
<h4><a href="https://tomcat.apache.org/migration.html">Migration Guide</a></h4>
<h4><a href="https://tomcat.apache.org/security.html">Security Notices</a></h4>
</div>
</div>
<div id="low-docs" class="">
<div class="curved container">
<h3>Documentation</h3>
<h4><a href="/docs/">Tomcat 9.0 Documentation</a></h4>
<h4><a href="/docs/config/">Tomcat 9.0 Configuration</a></h4>
<h4><a href="https://cwiki.apache.org/confluence/display/TOMCAT/">Tomcat Wiki</a></h4>
<p>Find additional important configuration information in:</p>
<pre>$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>
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<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>
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<div class="container">
<h4>Miscellaneous</h4>
<ul>
<li><a href="https://tomcat.apache.org/contact.html">Contact</a></li>
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0
Connection closed by foreign host.
[vagrant@centosstr9 ~]$
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。
以上