diff --git a/index.php b/index.php
index 44a8012..5dac7df 100644
--- a/index.php
+++ b/index.php
@@ -1,17 +1,39 @@
 <?php
 
+define('REQUEST_REGEX', '/^\/(?<supplier>[^\/]+)\/?(?<event>[^\/]+)\/?$/');
+define('SUPPLIER_REGEX', '/^[A-Za-z]\w{0,31}$/');
+define('EVENT_REGEX', '/^\d{4}\-[01]\d\-[0123]\d$/');
+define('ACTION_REGEX', '/^[a-z]{1,16}$/i');
+
 $requestUrl = trim(str_replace($_SERVER['QUERY_STRING'], '', $_SERVER['REQUEST_URI']), '?');
 
+if (preg_match(REQUEST_REGEX, $requestUrl, $match)) {
+	$requestSupplier = array_key_exists('supplier', $match) ? $match['supplier'] : null;
+	$requestEvent = array_key_exists('event', $match) ? $match['event'] : null;
+} 
+
+function generateUrl($supplier = null, $event = null) {
+	global $requestUrl;
+
+	if (is_null($supplier))
+		return $requestUrl;
+
+	if (is_null($event))
+		return sprintf('%s/%s', $requestUrl, $supplier);
+
+	return sprintf('%s/%s/%s', $requestUrl, $supplier, $event);
+}
+
 define('CONFIG_FILE', __DIR__ . DIRECTORY_SEPARATOR . 'config.php');
 define('DATA_FILE', __DIR__ . DIRECTORY_SEPARATOR . 'data.php');
 
 if (file_exists(CONFIG_FILE)) require_once CONFIG_FILE;
 if (!isset($config)) $config = [];
 
-$action = (isset($_REQUEST['action']) and preg_match('/^[a-z]{1,16}$/i', $_REQUEST['action'])) ? $_REQUEST['action'] : null;
+$action = (isset($_REQUEST['action']) and preg_match(ACTION_REGEX, $_REQUEST['action'])) ? $_REQUEST['action'] : null;
 
-$hasSupplier = isset($_REQUEST['supplier']) and !empty($_REQUEST['supplier']) and preg_match('/^[A-Za-z]\w{0,31}$/', $_REQUEST['supplier']);
-$supplier = $_REQUEST['supplier'];
+$supplier = array_key_exist('supplier', $_REQUEST) ? $_REQUEST['supplier'] : $requestSupplier;
+$hasSupplier = is_string($supplier) and preg_match(SUPPLIER_REGEX, $supplier);
 
 if ($hasSupplier) {
 
@@ -94,10 +116,11 @@ if ($action === 'config') {
 }
 
 try {
+	$event = array_key_exist('event', $_REQUEST) ? $_REQUEST['event'] : $requestEvent;
 	$hasEvent = (
-		isset($_REQUEST['event'])
-		and preg_match('/^\d{4}\-[01]\d\-[0123]\d$/', $_REQUEST['event'])
-		and ((new \DateTimeImmutable($_REQUEST['event'])) instanceof \DateTimeImmutable)
+		is_string($event)
+		and preg_match(EVENT_REGEX, $event)
+		and ((new \DateTimeImmutable($event)) instanceof \DateTimeImmutable)
 	);
 } catch (\Exception $exception) {
 	$hasEvent = false;
@@ -114,10 +137,9 @@ if (!$isConfig and $hasSupplier) {
 			and ($maxIterations-- > 0)
 		) $current->add($frequency);
 		$nextEvent = $current->format('Y-m-d');
-		header(sprintf('Location: %s?supplier=%s&event=%s', $requestUrl, $supplier, $nextEvent));
+		header('Location: ' . generateUrl($supplier, $nextEvent));
 		die();
 	} else {
-		$event = $_REQUEST['event'];
 		$current = new \DateTimeImmutable($event);
 		$frequency = \DateInterval::createFromDateString($config[$supplier]['frequency']);
 		$previous = $current->sub($frequency);
@@ -153,7 +175,7 @@ if (!$isConfig and $hasSupplier) {
 		);
 		flock($output, LOCK_UN);
 		fclose($output);
-		header(sprintf('Location: %s?supplier=%s&event=%s', $requestUrl, $supplier, $event));
+		header('Location: ' . generateUrl($supplier, $event));
 		die();
 	}
 
@@ -210,7 +232,7 @@ if (!$isConfig and $hasSupplier) {
 		<header>
 			<nav class="navbar navbar-dark bg-dark">
 				<div class="container-fluid">
-					<a class="navbar-brand" href="<?php echo $hasSupplier ? sprintf('%s?supplier=%s', $requestUrl, $supplier) : $requestUrl; ?>">
+					<a class="navbar-brand" href="<?php echo $hasSupplier ? generateUrl($supplier) : generateUrl(); ?>">
 						<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="currentColor" class="bi bi-basket d-inline-block align-text-top" viewBox="0 0 16 16">
 							<path d="M5.757 1.071a.5.5 0 0 1 .172.686L3.383 6h9.234L10.07 1.757a.5.5 0 1 1 .858-.514L13.783 6H15a1 1 0 0 1 1 1v1a1 1 0 0 1-1 1v4.5a2.5 2.5 0 0 1-2.5 2.5h-9A2.5 2.5 0 0 1 1 13.5V9a1 1 0 0 1-1-1V7a1 1 0 0 1 1-1h1.217L5.07 1.243a.5.5 0 0 1 .686-.172zM2 9v4.5A1.5 1.5 0 0 0 3.5 15h9a1.5 1.5 0 0 0 1.5-1.5V9H2zM1 7v1h14V7H1zm3 3a.5.5 0 0 1 .5.5v3a.5.5 0 0 1-1 0v-3A.5.5 0 0 1 4 10zm2 0a.5.5 0 0 1 .5.5v3a.5.5 0 0 1-1 0v-3A.5.5 0 0 1 6 10zm2 0a.5.5 0 0 1 .5.5v3a.5.5 0 0 1-1 0v-3A.5.5 0 0 1 8 10zm2 0a.5.5 0 0 1 .5.5v3a.5.5 0 0 1-1 0v-3a.5.5 0 0 1 .5-.5zm2 0a.5.5 0 0 1 .5.5v3a.5.5 0 0 1-1 0v-3a.5.5 0 0 1 .5-.5z"/>
 						</svg>
@@ -219,7 +241,7 @@ if (!$isConfig and $hasSupplier) {
 					<?php if ($hasSupplier) : ?>
 						<span class="navbar-text text-muted">
 						<?php if ($isConfig) : ?>
-							<a class="text-reset" href="<?php printf('%s?supplier=%s', $requestUrl, $supplier); ?>">Retour</a>
+							<a class="text-reset" href="<?php echo generateUrl($supplier); ?>">Retour</a>
 						<?php else : ?>
 							<?php if ($hasPassword) : ?>
 							<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-lock" viewBox="0 0 16 16">
@@ -230,7 +252,7 @@ if (!$isConfig and $hasSupplier) {
 								<path d="M11 1a2 2 0 0 0-2 2v4a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2V9a2 2 0 0 1 2-2h5V3a3 3 0 0 1 6 0v4a.5.5 0 0 1-1 0V3a2 2 0 0 0-2-2zM3 8a1 1 0 0 0-1 1v5a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1V9a1 1 0 0 0-1-1H3z"/>
 							</svg>
 							<?php endif; ?>
-							<a tabindex="-1" class="text-reset" href="<?php printf('%s?supplier=%s&action=config', $requestUrl, $supplier); ?>">Configuration</a>
+							<a tabindex="-1" class="text-reset" href="<?php printf('%s?action=config', generateUrl($supplier)); ?>">Configuration</a>
 						<?php endif; ?>
 						</span>
 					<?php endif; ?>
@@ -259,7 +281,7 @@ if (!$isConfig and $hasSupplier) {
 				</section>
 				<section class="container-fluid">
 					<div class="row g-3">	
-						<form action="<?php printf('%s?supplier=%s', $requestUrl, $supplier); ?>" method="post">
+						<form action="<?php echo generateUrl($supplier); ?>" method="post">
 							<div class="row mb-3">
 								<label for="title" class="col-sm-2 col-form-label">Titre</label>
 								<div class="col-sm-10">
@@ -319,20 +341,20 @@ if (!$isConfig and $hasSupplier) {
 								
 								<div class="btn-group float-end" role="group">
 									<?php if (isset($previousEvent)) : ?>
-										<a class="btn btn-outline-primary" href="<?php printf('%s?supplier=%s&event=%s', $requestUrl, $supplier, $previousEvent); ?>" title="Événement précédent">
+										<a class="btn btn-outline-primary" href="<?php echo generateUrl($supplier, $previousEvent); ?>" title="Événement précédent">
 											<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-left" viewBox="0 0 16 16">
 												<path fill-rule="evenodd" d="M15 8a.5.5 0 0 0-.5-.5H2.707l3.147-3.146a.5.5 0 1 0-.708-.708l-4 4a.5.5 0 0 0 0 .708l4 4a.5.5 0 0 0 .708-.708L2.707 8.5H14.5A.5.5 0 0 0 15 8z"/>
 											</svg>
 										</a>
 									<?php endif; ?>
-									<a class="btn btn-outline-primary" href="<?php printf('%s?supplier=%s&event=%s', $requestUrl, $supplier, $event); ?>" title="Cet événement">
+									<a class="btn btn-outline-primary" href="<?php echo generateUrl($supplier, $event); ?>" title="Cet événement">
 										<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
 											<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
 											<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
 										</svg>
 									</a>
 									<?php if (isset($nextEvent)) : ?>
-										<a class="btn btn-outline-primary" href="<?php printf('%s?supplier=%s&event=%s', $requestUrl, $supplier, $nextEvent); ?>" title="Événement suivant">
+										<a class="btn btn-outline-primary" href="<?php echo generateUrl($supplier, $nextEvent); ?>" title="Événement suivant">
 											<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-right" viewBox="0 0 16 16">
 												<path fill-rule="evenodd" d="M1 8a.5.5 0 0 1 .5-.5h11.793l-3.147-3.146a.5.5 0 0 1 .708-.708l4 4a.5.5 0 0 1 0 .708l-4 4a.5.5 0 0 1-.708-.708L13.293 8.5H1.5A.5.5 0 0 1 1 8z"/>
 											</svg>
@@ -348,7 +370,7 @@ if (!$isConfig and $hasSupplier) {
 				</section>
 				<section class="container-fluid">
 					<div class="row g-3">	
-						<form class="js-localremember" action="<?php printf('%s?supplier=%s', $requestUrl, $supplier); ?>" method="post">
+						<form class="js-localremember" action="<?php echo generateUrl($supplier); ?>" method="post">
 							<div class="row mb-3">
 								<label for="title" class="col-sm-2 col-form-label">Nom</label>
 								<div class="col-sm-10">