The latest articles on DEV Community by r6v4 (@rainbowvalue). https://dev.to/rainbowvalue https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F1207558%2Fee97e7e5-76d7-4760-9230-aea75b5f8725.png https://dev.to/rainbowvalue en r6v4 Wed, 22 Nov 2023 03:45:59 +0000 https://dev.to/rainbowvalue/use-wireshark-to-test-http20-on-ubuntu-1m1n https://dev.to/rainbowvalue/use-wireshark-to-test-http20-on-ubuntu-1m1n <h2> install wireshark on ubuntu </h2> <div class="highlight js-code-highlight"> <pre class="highlight shell"><code><span class="nb">sudo </span>add-apt-repository ppa:wireshark-dev/stable <span class="nb">sudo </span>apt update <span class="nb">sudo </span>apt <span class="nb">install </span>wireshark <span class="nb">sudo </span>dpkg-reconfigure wireshark-common <span class="nb">sudo </span>usermod <span class="nt">-aG</span> wireshark <span class="si">$(</span><span class="nb">whoami</span><span class="si">)</span> </code></pre> </div> <h2> start wireshark </h2> <ol> <li>choose <code>Loopback: lo</code> to see <code>127.0.0.1</code> or <code>::1</code> </li> <li>click <code>start capturing packets</code> </li> <li>input <code>tcp.port == 1234</code> in filter</li> </ol> <h2> run example </h2> <div class="highlight js-code-highlight"> <pre class="highlight common_lisp"><code><span class="c1">; server</span> <span class="p">(</span><span class="nv">ql:quickload</span> <span class="ss">'http2/server/example</span><span class="p">)</span> <span class="p">(</span><span class="nv">http2/server-example::run-demo-server</span> <span class="ss">:port</span> <span class="mi">1234</span><span class="p">)</span> <span class="c1">; client</span> <span class="c1">;; curl -k https://127.0.0.1:1234/</span> </code></pre> </div> <h2> alpn in <code>client-hello</code> </h2> <p><code>0010 000e 000c 02 6832 08 687474702f312e31</code></p> <ul> <li>Type: application_layer_protocol_negotiation [16] <code>0010</code> </li> <li>Length: [14] <code>000e</code> </li> <li>ALPN Extension Length: [12] <code>000c</code> </li> <li>ALPN string length: [2] <code>02</code> </li> <li>ALPN Next Protocol: [h2] <code>6832</code> </li> <li>ALPN string length: [8] <code>08</code> </li> <li>ALPN Next Protocol: [http/1.1] <code>687474702f312e31</code> </li> </ul> <h2> alpn in <code>server-hello</code> </h2> <p><code>0010 0005 0003 02 6832</code></p> <ul> <li>Type: application_layer_protocol_negotiation [16] <code>0010</code> </li> <li>Length: [5] <code>0005</code> </li> <li>ALPN Extension Length: [3] <code>0003</code> </li> <li>ALPN string length: [2] <code>02</code> </li> <li>ALPN Next Protocol: [h2] <code>6832</code> </li> </ul> wireshark http2 ubuntu testing