How to remove the Caddy file server footer from the response.

Table of Contents

History

DateChanges
2025/01/22Initial publication

Introduction

As a lover of Go, I’ve been switching all my backend webservers from Apache2 or Nginx to Caddy recently. It comes with a lot of features (comparison here and here) and packs great performance! For benchmarks, check here and here. Keep in mind these benchmarks are pretty old already, but it speaks for Caddy how good it was even in an “early” stage.

Caddy offers the capability to act as a web-based file browser for any given path configured in the Caddyfile. It displays a footer which I’d like to remove from the response, however.

Enter NetScaler, and the Rewrite capability.

Back to top

Caddy

Example configuration for Caddy using a Caddyfile:

  • Listen on port 80
  • Set the root path to /var/www/html
  • Enable the file_server and allow browsing the directories
:80 {
	root * /var/www/html
	file_server browse
}

When you open your browser and connect to your server, it will give you something like this:

Default Caddy file_server layout

Back to top

NetScaler

To increase security, it’s always a good idea to obfuscate/hide which software is in use, specifically to external visitors. Think about removing response headers, for example.

In this case, we want to remove the footer from the page that states Served with Caddy.

Default Caddy footer

It’s possible to achieve this using NetScaler’s Rewrite functionality, more specifically a Response Rewrite, to change the response before it’s being sent to the client.

Source

The source code of the page (as in the first image) looks like this:

<!DOCTYPE html>
<html>
	<head>
		<title>jantytgat</title>
		<link rel="canonical" href="/jantytgat/"  />
		<meta charset="utf-8">
		<meta name="color-scheme" content="light dark">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style nonce="a28993bc-41ef-4900-8bfb-56f3d7b211b1">
* { padding: 0; margin: 0; box-sizing: border-box; }

body {
	font-family: Inter, system-ui, sans-serif;
	font-size: 16px;
	text-rendering: optimizespeed;
	background-color: #f3f6f7;
	min-height: 100vh;
}

img,
svg {
	vertical-align: middle;
	z-index: 1;
}

img {
	max-width: 100%;
	max-height: 100%;
	border-radius: 5px;
}

td img {
	max-width: 1.5em;
	max-height: 2em;
	object-fit: cover;
}

body,
a,
svg,
.layout.current,
.layout.current svg,
.go-up {
	color: #333;
	text-decoration: none;
}

#layout-list, #layout-grid {
	cursor: pointer;
}

.wrapper {
	max-width: 1200px;
	margin-left: auto;
	margin-right: auto;
}

header,
.meta {
	padding-left: 5%;
	padding-right: 5%;
}

td a {
	color: #006ed3;
	text-decoration: none;
}

td a:hover {
	color: #0095e4;
}

td a:visited {
	color: #800080;
}

td a:visited:hover {
	color: #b900b9;
}

th:first-child,
td:first-child {
	width: 5%;
}

th:last-child,
td:last-child {
	width: 5%;
}

.size,
.timestamp {
	font-size: 14px;
}

.grid .size {
	font-size: 12px;
	margin-top: .5em;
	color: #496a84;
}

header {
	padding-top: 15px;
	padding-bottom: 15px;
	box-shadow: 0px 0px 20px 0px rgb(0 0 0 / 10%);
}

.breadcrumbs {
	text-transform: uppercase;
	font-size: 10px;
	letter-spacing: 1px;
	color: #939393;
	margin-bottom: 5px;
	padding-left: 3px;
}

h1 {
	font-size: 20px;
	font-family: Poppins, system-ui, sans-serif;
	font-weight: normal;
	white-space: nowrap;
	overflow-x: hidden;
	text-overflow: ellipsis;
	color: #c5c5c5;
}

h1 a,
th a {
	color: #000;
}

h1 a {
	padding: 0 3px;
	margin: 0 1px;
}

h1 a:hover {
	background: #ffffc4;
}

h1 a:first-child {
	margin: 0;
}

header,
main {
	background-color: white;
}

main {
	margin: 3em auto 0;
	border-radius: 5px;
	box-shadow: 0 2px 5px 1px rgb(0 0 0 / 5%);
}

.meta {
	display: flex;
	gap: 1em;
	font-size: 14px;
	border-bottom: 1px solid #e5e9ea;
	padding-top: 1em;
	padding-bottom: 1em;
}

#summary {
	display: flex;
	gap: 1em;
	align-items: center;
	margin-right: auto;
}

.filter-container {
	position: relative;
	display: inline-block;
	margin-left: 1em;
}

#search-icon {
	color: #777;
	position: absolute;
	height: 1em;
	top: .6em;
	left: .5em;
}

#filter {
	padding: .5em 1em .5em 2.5em;
	border: none;
	border: 1px solid #CCC;
	border-radius: 5px;
	font-family: inherit;
	position: relative;
	z-index: 2;
	background: none;
}

.layout,
.layout svg {
	color: #9a9a9a;
}

table {
	width: 100%;
	border-collapse: collapse;
}

tbody tr,
tbody tr a,
.entry a {
	transition: all .15s;
}

tbody tr:hover,
.grid .entry a:hover {
	background-color: #f4f9fd;
}

th,
td {
	text-align: left;
}

th {
	position: sticky;
	top: 0;
	background: white;
	white-space: nowrap;
	z-index: 2;
	text-transform: uppercase;
	font-size: 14px;
	letter-spacing: 1px;
	padding: .75em 0;
}

td {
	white-space: nowrap;
}

td:nth-child(2) {
	width: 75%;
}

td:nth-child(2) a {
	padding: 1em 0;
	display: block;
}

td:nth-child(3),
th:nth-child(3) {
	padding: 0 20px 0 20px;
	min-width: 150px;
}

td .go-up {
	text-transform: uppercase;
	font-size: 12px;
	font-weight: bold;
}

.name,
.go-up {
	word-break: break-all;
	overflow-wrap: break-word;
	white-space: pre-wrap;
}

.listing .icon-tabler {
	color: #454545;
}

.listing .icon-tabler-folder-filled {
	color: #ffb900 !important;
}

.sizebar {
	position: relative;
	padding: 0.25rem 0.5rem;
	display: flex;
}

.sizebar-bar {
	background-color: #dbeeff;
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	z-index: 0;
	height: 100%;
	pointer-events: none;
}

.sizebar-text {
	position: relative;
	z-index: 1;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(16em, 1fr));
	gap: 2px;
}

.grid .entry {
	position: relative;
	width: 100%;
}

.grid .entry a {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 1.5em;
	height: 100%;
}

.grid .entry svg {
	width: 75px;
	height: 75px;
}

.grid .entry img {
	max-height: 200px;
	object-fit: cover;
}

.grid .entry .name {
	margin-top: 1em;
}

footer {
	padding: 40px 20px;
	font-size: 12px;
	text-align: center;
}

.caddy-logo {
	display: inline-block;
	height: 2.5em;
	margin: 0 auto;
}

@media (max-width: 600px) {
	.hideable {
		display: none;
	}

	td:nth-child(2) {
		width: auto;
	}

	th:nth-child(3),
	td:nth-child(3) {
		padding-right: 5%;
		text-align: right;
	}

	h1 {
		color: #000;
	}

	h1 a {
		margin: 0;
	}

	#filter {
		max-width: 100px;
	}

	.grid .entry {
		max-width: initial;
	}
}


@media (prefers-color-scheme: dark) {
	html {
		background: black; /* overscroll */
	}

	body {
		background: linear-gradient(180deg, rgb(34 50 66) 0%, rgb(26 31 38) 100%);
		background-attachment: fixed;
	}

	body,
	a,
	svg,
	.layout.current,
	.layout.current svg,
	.go-up {
		color: #ccc;
	}

	h1 a,
	th a {
		color: white;
	}

	h1 {
		color: white;
	}

	h1 a:hover {
		background: hsl(213deg 100% 73% / 20%);
	}

	header,
	main,
	.grid .entry {
		background-color: #101720;
	}

	tbody tr:hover,
	.grid .entry a:hover {
		background-color: #162030;
		color: #fff;
	}

	th {
		background-color: #18212c;
	}

	td a,
	.listing .icon-tabler {
		color: #abc8e3;
	}

	td a:hover,
	td a:hover .icon-tabler {
		color: white;
	}

	td a:visited {
		color: #cd53cd;
	}

	td a:visited:hover {
		color: #f676f6;
	}

	#search-icon {
		color: #7798c4;
	}

	#filter {
		color: #ffffff;
		border: 1px solid #29435c;
	}

	.meta {
		border-bottom: 1px solid #222e3b;
	}

	.sizebar-bar {
		background-color: #1f3549;
	}

	.grid .entry a {
		background-color: #080b0f;
	}

	#Wordmark path,
	#R path {
		fill: #ccc !important;
	}
	#R circle {
		stroke: #ccc !important;
	}
}

</style>
</head>
<body>
	<header>
		<div class="wrapper">
			<div class="breadcrumbs">Folder Path</div>
				<h1>
					<a href="../">/</a><a href="">jantytgat</a>/
				</h1>
			</div>
		</header>
		<div class="wrapper">
			<main>
				<div class="meta">
					<div id="summary">
						<span class="meta-item">
							<b>0</b> directories
						</span>
						<span class="meta-item">
							<b>0</b> files
						</span>
						<span class="meta-item">
							<b>0 B</b> total 
						</span>
					</div>
					<a id="layout-list" class='layoutcurrent'>
						<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-layout-list" width="16" height="16" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
							<path stroke="none" d="M0 0h24v24H0z" fill="none"/>
							<path d="M4 4m0 2a2 2 0 0 1 2 -2h12a2 2 0 0 1 2 2v2a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2z"/>
							<path d="M4 14m0 2a2 2 0 0 1 2 -2h12a2 2 0 0 1 2 2v2a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2z"/>
						</svg>
						List
					</a>
					<a id="layout-grid" class='layout'>
						<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-layout-grid" width="16" height="16" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
							<path stroke="none" d="M0 0h24v24H0z" fill="none"/>
							<path d="M4 4m0 1a1 1 0 0 1 1 -1h4a1 1 0 0 1 1 1v4a1 1 0 0 1 -1 1h-4a1 1 0 0 1 -1 -1z"/>
							<path d="M14 4m0 1a1 1 0 0 1 1 -1h4a1 1 0 0 1 1 1v4a1 1 0 0 1 -1 1h-4a1 1 0 0 1 -1 -1z"/>
							<path d="M4 14m0 1a1 1 0 0 1 1 -1h4a1 1 0 0 1 1 1v4a1 1 0 0 1 -1 1h-4a1 1 0 0 1 -1 -1z"/>
							<path d="M14 14m0 1a1 1 0 0 1 1 -1h4a1 1 0 0 1 1 1v4a1 1 0 0 1 -1 1h-4a1 1 0 0 1 -1 -1z"/>
						</svg>
						Grid
					</a>
				</div>
				<div class='listing'>
				<table aria-describedby="summary">
					<thead>
					<tr>
						<th></th>
						<th>
							<a href="?sort=namedirfirst&order=desc" class="icon">
								<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-caret-up" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
									<path stroke="none" d="M0 0h24v24H0z" fill="none"/>
									<path d="M18 14l-6 -6l-6 6h12"/>
								</svg>
							</a>
							<a href="?sort=name&order=asc">
								Name
							</a>

							<div class="filter-container">
								<svg id="search-icon" xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-search" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
									<path stroke="none" d="M0 0h24v24H0z" fill="none"/>
									<path d="M10 10m-7 0a7 7 0 1 0 14 0a7 7 0 1 0 -14 0"/>
									<path d="M21 21l-6 -6"/>
								</svg>
								<input type="search" placeholder="Search" id="filter">
							</div>
						</th>
						<th>
							<a href="?sort=size&order=asc">
								Size
							</a>
						</th>
						<th class="hideable">
							<a href="?sort=time&order=asc">
								Modified
							</a>
						</th>
						<th class="hideable"></th>
					</tr>
					</thead>
					<tbody>
					<tr>
						<td></td>
						<td>
							<a href="..">
								<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-corner-left-up" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
									<path stroke="none" d="M0 0h24v24H0z" fill="none"/>
									<path d="M18 18h-6a3 3 0 0 1 -3 -3v-10l-4 4m8 0l-4 -4"/>
								</svg>
								<span class="go-up">Up</span>
							</a>
						</td>
						<td></td>
						<td class="hideable"></td>
						<td class="hideable"></td>
					</tr>
					</tbody>
				</table>
			</div>
			</main>
		</div>
		<footer>
			Served with
			<a rel="noopener noreferrer" href="https://caddyserver.com">
				<svg class="caddy-logo" viewBox="0 0 379 114" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" fill-rule="evenodd" clip-rule="evenodd" stroke-linecap="round" stroke-linejoin="round">
					<g transform="matrix(1,0,0,1,-1982.99,-530.985)">
						<g transform="matrix(1.16548,0,0,1.10195,1823.12,393.466)">
							<g transform="matrix(1,0,0,1,0.233052,1.17986)">
								<g id="Icon" transform="matrix(0.858013,0,0,0.907485,-3224.99,-1435.83)">
									<g>
										<g transform="matrix(-0.191794,-0.715786,0.715786,-0.191794,4329.14,4673.64)">
											<path d="M3901.56,610.734C3893.53,610.261 3886.06,608.1 3879.2,604.877C3872.24,601.608 3866.04,597.093 3860.8,591.633C3858.71,589.457 3856.76,587.149 3854.97,584.709C3853.2,582.281 3851.57,579.733 3850.13,577.066C3845.89,569.224 3843.21,560.381 3842.89,550.868C3842.57,543.321 3843.64,536.055 3845.94,529.307C3848.37,522.203 3852.08,515.696 3856.83,510.049L3855.79,509.095C3850.39,514.54 3846.02,520.981 3842.9,528.125C3839.84,535.125 3838.03,542.781 3837.68,550.868C3837.34,561.391 3839.51,571.425 3843.79,580.306C3845.27,583.38 3847.03,586.304 3849.01,589.049C3851.01,591.806 3853.24,594.39 3855.69,596.742C3861.75,602.568 3869,607.19 3877.03,610.1C3884.66,612.867 3892.96,614.059 3901.56,613.552L3901.56,610.734Z" fill="rgb(0,144,221)"/>
										</g>
										<g transform="matrix(-0.191794,-0.715786,0.715786,-0.191794,4329.14,4673.64)">
											<path d="M3875.69,496.573C3879.62,494.538 3883.8,492.897 3888.2,491.786C3892.49,490.704 3896.96,490.124 3901.56,490.032C3903.82,490.13 3906.03,490.332 3908.21,490.688C3917.13,492.147 3925.19,495.814 3932.31,500.683C3936.13,503.294 3939.59,506.335 3942.81,509.619C3947.09,513.98 3950.89,518.816 3953.85,524.232C3958.2,532.197 3960.96,541.186 3961.32,550.868C3961.61,558.748 3960.46,566.345 3957.88,573.322C3956.09,578.169 3953.7,582.753 3950.66,586.838C3947.22,591.461 3942.96,595.427 3938.27,598.769C3933.66,602.055 3928.53,604.619 3923.09,606.478C3922.37,606.721 3921.6,606.805 3920.93,607.167C3920.42,607.448 3920.14,607.854 3919.69,608.224L3920.37,610.389C3920.98,610.432 3921.47,610.573 3922.07,610.474C3922.86,610.344 3923.55,609.883 3924.28,609.566C3931.99,606.216 3938.82,601.355 3944.57,595.428C3947.02,592.903 3949.25,590.174 3951.31,587.319C3953.59,584.168 3955.66,580.853 3957.43,577.348C3961.47,569.34 3964.01,560.422 3964.36,550.868C3964.74,540.511 3962.66,530.628 3958.48,521.868C3955.57,515.775 3951.72,510.163 3946.95,505.478C3943.37,501.962 3939.26,498.99 3934.84,496.562C3926.88,492.192 3917.87,489.76 3908.37,489.229C3906.12,489.104 3903.86,489.054 3901.56,489.154C3896.87,489.06 3892.3,489.519 3887.89,490.397C3883.3,491.309 3878.89,492.683 3874.71,494.525L3875.69,496.573Z" fill="rgb(0,144,221)"/>
										</g>
									</g>
									<g>
										<g transform="matrix(-3.37109,-0.514565,0.514565,-3.37109,4078.07,1806.88)">
											<path d="M22,12C22,10.903 21.097,10 20,10C19.421,10 18.897,10.251 18.53,10.649C18.202,11.006 18,11.481 18,12C18,13.097 18.903,14 20,14C21.097,14 22,13.097 22,12Z" fill="none" fill-rule="nonzero" stroke="rgb(0,144,221)" stroke-width="1.05px"/>
										</g>
										<g transform="matrix(-5.33921,-5.26159,-3.12106,-6.96393,4073.87,1861.55)">
											<path d="M10.315,5.333C10.315,5.333 9.748,5.921 9.03,6.673C7.768,7.995 6.054,9.805 6.054,9.805L6.237,9.86C6.237,9.86 8.045,8.077 9.36,6.771C10.107,6.028 10.689,5.444 10.689,5.444L10.315,5.333Z" fill="rgb(0,144,221)"/>
										</g>
									</g>
									<g id="Padlock" transform="matrix(3.11426,0,0,3.11426,3938.31,1737.25)">
										<g>
											<path d="M9.876,21L18.162,21C18.625,21 19,20.625 19,20.162L19,11.838C19,11.375 18.625,11 18.162,11L5.838,11C5.375,11 5,11.375 5,11.838L5,16.758" fill="none" stroke="rgb(34,182,56)" stroke-width="1.89px" stroke-linecap="butt" stroke-linejoin="miter"/>
											<path d="M8,11L8,7C8,4.806 9.806,3 12,3C14.194,3 16,4.806 16,7L16,11" fill="none" fill-rule="nonzero" stroke="rgb(34,182,56)" stroke-width="1.89px"/>
										</g>
									</g>
									<g>
										<g transform="matrix(5.30977,0.697415,-0.697415,5.30977,3852.72,1727.97)">
											<path d="M22,12C22,11.659 21.913,11.337 21.76,11.055C21.421,10.429 20.756,10 20,10C18.903,10 18,10.903 18,12C18,13.097 18.903,14 20,14C21.097,14 22,13.097 22,12Z" fill="none" fill-rule="nonzero" stroke="rgb(0,144,221)" stroke-width="0.98px"/>
										</g>
										<g transform="matrix(4.93114,2.49604,1.11018,5.44847,3921.41,1726.72)">
											<path d="M8.902,6.77C8.902,6.77 7.235,8.253 6.027,9.366C5.343,9.996 4.819,10.502 4.819,10.502L5.52,11.164C5.52,11.164 6.021,10.637 6.646,9.951C7.749,8.739 9.219,7.068 9.219,7.068L8.902,6.77Z" fill="rgb(0,144,221)"/>
										</g>
									</g>
								</g>
								<g id="Text">
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				</svg>
			</a>
		</footer>

		<script nonce="a28993bc-41ef-4900-8bfb-56f3d7b211b1">
			const filterEl = document.getElementById('filter');
			filterEl?.focus({ preventScroll: true });

			function initPage() {
				// populate and evaluate filter
				if (!filterEl?.value) {
					const filterParam = new URL(window.location.href).searchParams.get('filter');
					if (filterParam) {
						filterEl.value = filterParam;
					}
				}
				filter();

				// fill in size bars
				let largest = 0;
				document.querySelectorAll('.size').forEach(el => {
					largest = Math.max(largest, Number(el.dataset.size));
				});
				document.querySelectorAll('.size').forEach(el => {
					const size = Number(el.dataset.size);
					const sizebar = el.querySelector('.sizebar-bar');
					if (sizebar) {
						sizebar.style.width = `${size/largest * 100}%`;
					}
				});
			}

			function filter() {
				if (!filterEl) return;
				const q = filterEl.value.trim().toLowerCase();
				document.querySelectorAll('tr.file').forEach(function(el) {
					if (!q) {
						el.style.display = '';
						return;
					}
					const nameEl = el.querySelector('.name');
					const nameVal = nameEl.textContent.trim().toLowerCase();
					if (nameVal.indexOf(q) !== -1) {
						el.style.display = '';
					} else {
						el.style.display = 'none';
					}
				});
			}

			const filterElem = document.getElementById("filter");
			if (filterElem) {
				filterElem.addEventListener("keyup", filter);
			}

			document.getElementById("layout-list").addEventListener("click", function() {
				queryParam('layout', '');
			});
			document.getElementById("layout-grid").addEventListener("click", function() {
				queryParam('layout', 'grid');
			});

			window.addEventListener("load", initPage);

			function queryParam(k, v) {
				const qs = new URLSearchParams(window.location.search);
				if (!v) {
					qs.delete(k);
				} else {
					qs.set(k, v);
				}
				const qsStr = qs.toString();
				if (qsStr) {
					window.location.search = qsStr;
				} else {
					window.location = window.location.pathname;
				}
			}

			function localizeDatetime(e, index, ar) {
				if (e.textContent === undefined) {
					return;
				}
				var d = new Date(e.getAttribute('datetime'));
				if (isNaN(d)) {
					d = new Date(e.textContent);
					if (isNaN(d)) {
						return;
					}
				}
				e.textContent = d.toLocaleString();
			}
			var timeList = Array.prototype.slice.call(document.getElementsByTagName("time"));
			timeList.forEach(localizeDatetime);
		</script>
	</body>
</html>

Solution

If you take a look at the source code above, we can find an easy fix:

  • Remove everything between <footer> and </footer> and we’re done.

How to get there:

  • Search in the response body
  • Look for the string </main>, which directly precedes <footer>, and select all text after that string
  • Use a regular expression to find and select all text between <footer> and </footer>, including the footer-tags.

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Rewrite Action

CLI

add rewrite action RWA_CADDY_REMOVE_FOOTER replace_all "HTTP.RES.BODY(400000).AFTER_STR(\"</main>\")" "\"\"" -search "regex(re~<footer>.*</footer>~)"

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GUI

  • Add rewrite action Add rewrite action

  • Rewrite actions overview Rewrite actions overview

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Rewrite policy

CLI

add rewrite policy RWP_CADDY_REMOVE_FOOTER "HTTP.RES.BODY(40000).CONTAINS(\"footer\") && false" RWA_CADDY_REMOVE_FOOTER

GUI

  • Add rewrite policy Add rewrite policy

  • Rewrite policies overview Rewrite policies overview

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Result

When you bind the rewrite policy to your content-switching or load-balancing virtual server, the response will no longer contain the footer.

bind cs vserver <csvserver> -policyName RWP_CADDY_REMOVE_FOOTER -priority 500 -gotoPriorityExpression NEXT -type RESPONSE

or

bind lb vserver <lbvserver> -policyName RWP_CADDY_REMOVE_FOOTER -priority 500 -gotoPriorityExpression NEXT -type RESPONSE

Result

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