diff --git a/dav/calendar.friendica.fnk.php b/dav/calendar.friendica.fnk.php
index 38406e0b3..43417fc94 100644
--- a/dav/calendar.friendica.fnk.php
+++ b/dav/calendar.friendica.fnk.php
@@ -1,8 +1,15 @@
 <?php
 
+$a = get_app();
+$uri = parse_url($a->get_baseurl());
+$path = "";
+if (strlen($uri["path"]) > 1) {
+	$path = $uri["path"] . "/";
+}
+
 define("CALDAV_SQL_DB", "");
 define("CALDAV_SQL_PREFIX", "dav_");
-define("CALDAV_URL_PREFIX", "dav/");
+define("CALDAV_URL_PREFIX", $path . "dav/");
 
 define("CALDAV_NAMESPACE_PRIVATE", 1);
 define("CALDAV_NAMESPACE_FRIENDICA_NATIVE", 2);
diff --git a/dav/common/calendar.fnk.php b/dav/common/calendar.fnk.php
index 2d899b475..51b7f5e03 100644
--- a/dav/common/calendar.fnk.php
+++ b/dav/common/calendar.fnk.php
@@ -480,7 +480,7 @@ function wdcal_get_list_range_params($day, $weekstartday, $num_days, $type)
 /**
  *
  */
-function wdcal_print_feed()
+function wdcal_print_feed($base_path = "")
 {
 	$user_id = dav_compat_get_curr_user_id();
 	$cals    = array();
@@ -538,7 +538,7 @@ function wdcal_print_feed()
 			$ret['error']  = null;
 
 			foreach ($cals as $c) {
-				$events        = $c->listItemsByRange($date[0], $date[1]);
+				$events        = $c->listItemsByRange($date[0], $date[1], $base_path);
 				$ret["events"] = array_merge($ret["events"], $events);
 			}
 
diff --git a/dav/common/wdcal_cal_source.inc.php b/dav/common/wdcal_cal_source.inc.php
index dafc2b5c6..9db340221 100644
--- a/dav/common/wdcal_cal_source.inc.php
+++ b/dav/common/wdcal_cal_source.inc.php
@@ -113,9 +113,10 @@ abstract class AnimexxCalSource
 	 * @abstract
 	 * @param string $sd
 	 * @param string $ed
+	 * @param string $base_path
 	 * @return array
 	 */
-	public abstract function listItemsByRange($sd, $ed);
+	public abstract function listItemsByRange($sd, $ed, $base_path);
 
 
 	/**
@@ -134,4 +135,4 @@ abstract class AnimexxCalSource
 		return null;
 	}
 
-}
\ No newline at end of file
+}
diff --git a/dav/common/wdcal_cal_source_private.inc.php b/dav/common/wdcal_cal_source_private.inc.php
index 465633899..cb5918e18 100644
--- a/dav/common/wdcal_cal_source_private.inc.php
+++ b/dav/common/wdcal_cal_source_private.inc.php
@@ -249,7 +249,7 @@ class AnimexxCalSourcePrivate extends AnimexxCalSource
 		return $obj_id . ".ics";
 	}
 
-	private function jqcal2wdcal($row, $usr_id) {
+	private function jqcal2wdcal($row, $usr_id, $base_path) {
 		$evo             = new DBClass_friendica_jqcalendar($row);
 		$not             = q("SELECT COUNT(*) num FROM %s%snotifications WHERE `ical_uri` = '%s' AND `ical_recurr_uri` = '%s'",
 			CALDAV_SQL_DB, CALDAV_SQL_PREFIX, dbesc($row["ical_uri"]), $row["ical_recurr_uri"]
@@ -274,8 +274,8 @@ class AnimexxCalSourcePrivate extends AnimexxCalSource
 			"location"          => $evo->Location,
 			"attendees"         => '',
 			"has_notification"  => ($not[0]["num"] > 0 ? 1 : 0),
-			"url_detail"        => "/dav/wdcal/" . $evo->ical_uri . "/",
-			"url_edit"          => "/dav/wdcal/" . $evo->ical_uri . "/edit/",
+			"url_detail"        => $base_path . $evo->ical_uri . "/",
+			"url_edit"          => $base_path . $evo->ical_uri . "/edit/",
 			"special_type"      => "",
 		);
 		return $arr;
@@ -284,9 +284,10 @@ class AnimexxCalSourcePrivate extends AnimexxCalSource
 	/**
 	 * @param string $sd
 	 * @param string $ed
+	 * @param string $base_path
 	 * @return array
 	 */
-	public function listItemsByRange($sd, $ed)
+	public function listItemsByRange($sd, $ed, $base_path)
 	{
 
 		$usr_id = IntVal($this->calendarDb->uid);
@@ -300,7 +301,7 @@ class AnimexxCalSourcePrivate extends AnimexxCalSource
 			$usr_id, $this->getNamespace(), $this->namespace_id, dbesc($von), dbesc($bis));
 
 		$events = array();
-		foreach ($evs as $row) $events[] = $this->jqcal2wdcal($row, $usr_id);
+		foreach ($evs as $row) $events[] = $this->jqcal2wdcal($row, $usr_id, $base_path);
 
 		return $events;
 	}
diff --git a/dav/layout.fnk.php b/dav/layout.fnk.php
index 10bf57efc..a712a09bc 100644
--- a/dav/layout.fnk.php
+++ b/dav/layout.fnk.php
@@ -96,7 +96,7 @@ function wdcal_printCalendar($calendars, $calendar_preselected, $data_feed_url,
 		$x .= '<label style="margin-left: 10px; margin-right: 10px;"><input type="checkbox" name="cals[]" value="' . $cal["ns"] . '-' . $cal["id"] . '"';
 		$found = false;
 		foreach ($calendar_preselected as $pre) if ($pre["ns"] == $cal["ns"] && $pre["id"] == $cal["id"]) $found = true;
-		if ($found) $x .= 'checked';
+		if ($found) $x .= ' checked';
 		$x .= '> ' . escape_tags($cal["displayname"]) . '</label> ';
 	}
 
@@ -109,7 +109,7 @@ function wdcal_printCalendar($calendars, $calendar_preselected, $data_feed_url,
 
 		$x .= '<div class="ctoolbar">
 		<div class="fbutton faddbtn" style="float: right;">
-			<div><a href="/dav/settings/"><span>' . t("Settings") . ' / ' . t("Help") . '</span></a></div>
+			<div><a href="' . $a->get_baseurl() . '/dav/settings/"><span>' . t("Settings") . ' / ' . t("Help") . '</span></a></div>
 		</div>
 		<div class="btnseparator"></div>
 		<div class="fbutton showtodaybtn">
@@ -191,7 +191,7 @@ function wdcal_getDetailPage($uri, $recurr_uri)
 			$details = $cs->getItemByUri($uri);
 		} catch (Exception $e) {
 			notification(t("Error") . ": " . $e);
-			goaway("/dav/wdcal/");
+			goaway($a->get_baseurl() . "/dav/wdcal/");
 		}
 	}
 
@@ -211,7 +211,7 @@ function wdcal_postEditPage($uri, $recurr_uri)
 	$a            = get_app();
 	$localization = wdcal_local::getInstanceByUser($a->user["uid"]);
 
-	check_form_security_token_redirectOnErr("/dav/wdcal/", "caledit");
+	check_form_security_token_redirectOnErr($a->get_baseurl() . "/dav/wdcal/", "caledit");
 
 	if (isset($_REQUEST["allday"])) {
 		$start    = $localization->date_parseLocal($_REQUEST["start_date"] . " 00:00");
@@ -236,7 +236,7 @@ function wdcal_postEditPage($uri, $recurr_uri)
 		} catch (Exception $e) {
 			notification(t("Error") . ": " . $e);
 		}
-		goaway("/dav/wdcal/");
+		goaway($a->get_baseurl() . "/dav/wdcal/");
 	}
 
 }
@@ -323,8 +323,8 @@ function wdcal_getEditPage($uri, $recurr_uri)
 	}
 
 
-	$out = "<a href='/dav/wdcal/'>" . t("Go back to the calendar") . "</a><br><br>";
-	$out .= "<form method='POST' action='/dav/wdcal/$uri/edit/'><input type='hidden' name='form_security_token' value='" . get_form_security_token('caledit') . "'>\n";
+	$out = "<a href='" . $a->get_baseurl() . "/dav/wdcal/'>" . t("Go back to the calendar") . "</a><br><br>";
+	$out .= "<form method='POST' action='" . $a->get_baseurl() . "/dav/wdcal/$uri/edit/'><input type='hidden' name='form_security_token' value='" . get_form_security_token('caledit') . "'>\n";
 
 	$out .= "<label for='cal_subject'>Subject:</label>
 		<input name='color' id='cal_color' value='" . (strlen($event["Color"]) != 7 ? "#5858ff" : escape_tags($event["Color"])) . "'>
@@ -389,19 +389,19 @@ function wdcal_getSettingsPage(&$a)
 	}
 
 	if (isset($_REQUEST["save"])) {
-		check_form_security_token_redirectOnErr('/dav/settings/', 'calprop');
+		check_form_security_token_redirectOnErr($a->get_baseurl() . '/dav/settings/', 'calprop');
 		set_pconfig($a->user["uid"], "dav", "dateformat", $_REQUEST["wdcal_date_format"]);
 		info(t('The new values have been saved.'));
 	}
 
 	$o = "";
 
-	$o .= "<a href='/dav/wdcal/'>" . t("Go back to the calendar") . "</a><br><br>";
+	$o .= "<a href='" . $a->get_baseurl() . "/dav/wdcal/'>" . t("Go back to the calendar") . "</a><br><br>";
 
 	$o .= '<h3>' . t('Calendar Settings') . '</h3>';
 
 	$current_format = wdcal_local::getInstanceByUser($a->user["uid"]);
-	$o .= '<form method="POST" action="/dav/settings/">';
+	$o .= '<form method="POST" action="' . $a->get_baseurl() . '/dav/settings/">';
 	$o .= "<input type='hidden' name='form_security_token' value='" . get_form_security_token('calprop') . "'>\n";
 
 	$o .= '<label for="wdcal_date_format">' . t('Date format') . ':</label><select name="wdcal_date_format" id="wdcal_date_format" size="1">';
@@ -441,7 +441,7 @@ function wdcal_getSettingsPage(&$a)
 	<li>Add a new account</li>
 	<li>Other...</li>
 	<li>Calendar -> CalDAV-Account</li>
-	<li><b>Server:</b> " . $a->get_hostname() . "/dav/ / <b>Username/Password:</b> <em>the same as your friendica-login</em></li>
+	<li><b>Server:</b> " . $a->get_baseurl() . "/dav/ / <b>Username/Password:</b> <em>the same as your friendica-login</em></li>
 	</ul>";
 
 	$o .= '<h4>' . t('Synchronizing your Friendica-Contacts with the iPhone') . '</h4>';
@@ -452,7 +452,7 @@ function wdcal_getSettingsPage(&$a)
 	<li>Add a new account</li>
 	<li>Other...</li>
 	<li>Contacts -> CardDAV-Account</li>
-	<li><b>Server:</b> " . $a->get_hostname() . "/dav/ / <b>Username/Password:</b> <em>the same as your friendica-login</em></li>
+	<li><b>Server:</b> " . $a->get_baseurl() . "/dav/ / <b>Username/Password:</b> <em>the same as your friendica-login</em></li>
 	</ul>";
 
 	return $o;
diff --git a/dav/main.php b/dav/main.php
index bc5aeab02..b71ef6196 100644
--- a/dav/main.php
+++ b/dav/main.php
@@ -29,9 +29,6 @@ function dav_module()
 function dav_init(&$a)
 {
 
-	error_reporting(E_ALL);
-	ini_set("display_errors", 1);
-
 	/*
 	 * Recommended settings:
 	 * ALTER TABLE `photo` ADD INDEX ( `contact-id` )
@@ -91,7 +88,7 @@ function dav_init(&$a)
 	if ($a->argc >= 2 && $a->argv[1] == "wdcal") {
 
 		if ($a->argc >= 3 && $a->argv[2] == "feed") {
-			wdcal_print_feed();
+			wdcal_print_feed($a->get_baseurl() . "/dav/wdcal/");
 			killme();
 		} elseif ($a->argc >= 3 && strlen($a->argv[2]) > 0) {
 			wdcal_addRequiredHeadersEdit();
@@ -133,7 +130,8 @@ function dav_init(&$a)
 // The object tree needs in turn to be passed to the server class
 	$server = new Sabre_DAV_Server($tree);
 
-	$server->setBaseUri("/" . CALDAV_URL_PREFIX);
+	$url = parse_url($a->get_baseurl());
+	$server->setBaseUri(CALDAV_URL_PREFIX);
 
 	$authPlugin = new Sabre_DAV_Auth_Plugin($authBackend, 'SabreDAV');
 	$server->addPlugin($authPlugin);
@@ -186,7 +184,7 @@ function dav_content()
 			$cals      = dav_getMyCals($a->user["uid"]);
 			$cals_show = array();
 			foreach ($cals as $e) $cals_show[] = array("ns" => $e->namespace, "id" => $e->namespace_id, "displayname" => $e->displayname);
-			$x = wdcal_printCalendar($cals, $cals_show, "/dav/wdcal/feed/", "week", 0, 200);
+			$x = wdcal_printCalendar($cals, $cals_show, $a->get_baseurl() . "/dav/wdcal/feed/", "week", 0, 200);
 		}
 	}
 	return $x;
@@ -223,7 +221,7 @@ function dav_profile_tabs_hook(&$a, &$b)
 {
 	$b["tabs"][] = array(
     	"label" => t('Calendar'),
-		"url" => "/dav/wdcal/",
+		"url" => $a->get_baseurl() . "/dav/wdcal/",
 		"sel" => "",
 		"title" => t('Extended calendar with CalDAV-support'),
 	);
@@ -281,4 +279,4 @@ function dav_plugin_admin(&$a, &$o)
 	$tables = dav_get_create_statements();
 	foreach ($tables as $t) $o .= escape_tags($t . "\n\n");
 	$o .= "</pre></blockquote>";
-}
\ No newline at end of file
+}
diff --git a/dav/wdcal/css/calendar.css b/dav/wdcal/css/calendar.css
index 6e7a08f85..0f82e9ea8 100644
--- a/dav/wdcal/css/calendar.css
+++ b/dav/wdcal/css/calendar.css
@@ -515,8 +515,10 @@ border-bottom:2px solid #c3c3ff;
 	position: absolute; visibility: hidden; font-size: 9pt; top: 0px; left: 0px
 }
 .bubble-table {
-	width: 100%; TABLE-LAYOUT: fixed
+	width: 100%; TABLE-LAYOUT: fixed;
+	border-spacing: 0;
 }
+.bubble-table > tbody > tr > td { padding: 0; }
 .bubble-cell-side {
 	width: 25px
 }
@@ -685,4 +687,4 @@ border-bottom:2px solid #c3c3ff;
 .monthdayshow:hover
 {
     text-decoration:underline;
-}
\ No newline at end of file
+}
diff --git a/dav/wdcal_cal_source_friendicaevents.inc.php b/dav/wdcal_cal_source_friendicaevents.inc.php
index 7acdf89a9..ed44bf965 100644
--- a/dav/wdcal_cal_source_friendicaevents.inc.php
+++ b/dav/wdcal_cal_source_friendicaevents.inc.php
@@ -85,6 +85,7 @@ class FriendicaCalSourceEvents extends AnimexxCalSource
 		$end = wdcal_mySql2PhpTime($row["data_end"]);
 		if ($row["data_allday"]) $end--;
 		$start = wdcal_mySql2PhpTime($row["data_start"]);
+		$a = get_app();
 		$arr             = array(
 			"uri"               => $row["data_uri"],
 			"subject"           => escape_tags($row["data_subject"]),
@@ -99,7 +100,7 @@ class FriendicaCalSourceEvents extends AnimexxCalSource
 			"location"          => $row["data_location"],
 			"attendees"         => '',
 			"has_notification"  => false,
-			"url_detail"        => "/dav/wdcal/" . $row["data_uri"] . "/",
+			"url_detail"        => $a->get_baseurl() . "/dav/wdcal/" . $row["data_uri"] . "/",
 			"url_edit"          => "",
 			"special_type"      => ($row["data_type"] == "birthday" ? "birthday" : ""),
 		);
@@ -109,9 +110,10 @@ class FriendicaCalSourceEvents extends AnimexxCalSource
 	/**
 	 * @param string $sd
 	 * @param string $ed
+	 * @param string $base_path
 	 * @return array
 	 */
-	public function listItemsByRange($sd, $ed)
+	public function listItemsByRange($sd, $ed, $base_path)
 	{
 		$usr_id = IntVal($this->calendarDb->uid);
 
@@ -149,8 +151,9 @@ class FriendicaCalSourceEvents extends AnimexxCalSource
 	public function getItemDetailRedirect($uri) {
 		$x = explode("@", $uri);
 		$y = explode("-", $x[0]);
+		$a = get_app();
 		if (count($y) != 3) {
-			goaway("/dav/wdcal/");
+			goaway($a->get_baseurl() . "/dav/wdcal/");
 			killme();
 		}
 		$a = get_app();