From 1ddf7cc2a77f21e9116a4a78d6adbbd7a4bbbb7b Mon Sep 17 00:00:00 2001
From: p2r3 <41925384+p2r3@users.noreply.github.com>
Date: Thu, 13 Aug 2026 14:53:25 +0300
Subject: [PATCH] add link handling to 404 page

---
 404.html | 168 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 404.html
diff --git a/404.html b/404.html
new file mode 100644
index 0000000..6a29820
--- /dev/null
+++ b/404.html
@@ -0,0 +1,168 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>ha.mr - link compressor</title>
+  <style>
+    @import url('https://fonts.googleapis.com/css2?family=Hammersmith+One&display=swap');
+    html, body {
+      margin: 0;
+      width: 100%;
+      height: 100%;
+    }
+    body {
+      display: flex;
+      justify-content: center;
+      align-items: center;
+      font-size: 120%;
+    }
+    * {
+      font-family: "Hammersmith One", sans-serif;
+    }
+    #loader {
+      position: absolute;
+      border: 0.5em solid lightgray;
+      border-radius: 50%;
+      border-top: 0.5em solid gray;
+      width: 3em;
+      height: 3em;
+      -webkit-animation: spin 1.5s linear infinite;
+      animation: spin 1.5s linear infinite;
+      opacity: 1;
+      pointer-events: none;
+      transition: opacity 1s;
+    }
+    @-webkit-keyframes spin {
+      0% { -webkit-transform: rotate(0deg); }
+      100% { -webkit-transform: rotate(360deg); }
+    }
+    @keyframes spin {
+      0% { transform: rotate(0deg); }
+      100% { transform: rotate(360deg); }
+    }
+    #content {
+      display: flex;
+      flex-direction: column;
+      align-items: center;
+      opacity: 0;
+      pointer-events: none;
+      transition: opacity 1s;
+    }
+    h1 {
+      margin: 0;
+    }
+    p {
+      margin-top: 0;
+    }
+    label {
+      font-size: 0.9em;
+    }
+    span {
+      text-align: center;
+    }
+    .title {
+      font-size: 2.5em;
+    }
+    .subtitle {
+      font-size: 0.6em;
+      margin-top: -10px;
+      font-style: italic;
+      opacity: 0.8;
+    }
+    #input-link {
+      padding: 5px 8px;
+      border: 0;
+      outline: 0;
+      border-bottom: 2px solid darkgray;
+      border-radius: 10px;
+      margin: 10px 0;
+      font-size: 16px;
+      background-color: rgb(230, 230, 230);
+    }
+    #output-link-container {
+      margin: 10px 0 0 0;
+      text-align: center;
+    }
+    #output-link {
+      color: rgb(50, 100, 255);
+      word-break: break-all;
+    }
+    #output-ratio {
+      transition: color 0.5s;
+      color: gray;
+      user-select: none;
+    }
+    #qrcode {
+      display: none;
+    }
+    #qr-correct-level-container {
+      display: none;
+    }
+    #query-warning {
+      display: none;
+      font-size: 1rem;
+      text-align: justify;
+      text-align-last: center;
+      max-width: 80vmin;
+      background-color: gold;
+      padding: 5px 10px;
+      border-radius: 10px;
+      margin: 5px 0 15px 0;
+    }
+    #query-warning summary {
+      cursor: pointer;
+    }
+  </style>
+  <script src="/qrcode.js"></script>
+</head>
+<body>
+
+  <div id="loader"></div>
+
+  <div id="content">
+
+    <h1 class="title">ha.mr</h1>
+    <p class="subtitle">(read: "hammer")</p>
+
+    <input type="text" id="input-link" placeholder="https://some-long.link/" autofocus>
+    <details id="query-warning">
+      <summary>Consider removing parameters...</summary>
+      <br>
+      Some links include data that isn't necessary for the link to function,
+      such as tracking information or page state. This data comes in the
+      form of <i>query parameters</i>, marked by "?" and "&amp;" characters.
+      <br><br>
+      Removing these segments can sometimes significantly shorten the link
+      without breaking it. For example, an Amazon product link contains a lot
+      of tracking information. Everything past the "?" symbol can be safely
+      removed, making the link much shorter.
+    </details>
+    <p id="output-link-container">
+      <a id="output-link" target="_blank">Enter a link above to compress</a>
+      <br><span id="output-ratio">&nbsp;</span>
+    </p>
+
+    <image width="256" height="256" id="qrcode"></image>
+
+    <span id="qr-correct-level-container">
+      <label>QR code error correction threshold</label>
+      <br>
+      <input type="range" name="qr-correct-level" id="qr-correct-level" autocomplete="off" min="0" max="3" value="1">
+    </span>
+
+    <span style="margin-top:20px">
+      <input type="checkbox" id="settings-emoji" name="settings-emoji" autocomplete="off">
+      <label for="settings-emoji"> Use emoji in text output</label><br>
+    </span>
+    <span>
+      <input type="checkbox" id="settings-qr" name="settings-qr" autocomplete="off">
+      <label for="settings-qr"> Output QR code</label><br>
+    </span>
+    <br><br>
+
+  </div>
+
+  <script type="module" src="/main.js"></script>
+</body>
+</html>
