diff --git a/fifo-webui/command.php b/fifo-webui/command.php
index 4dad2ee..0dd7741 100644
--- a/fifo-webui/command.php
+++ b/fifo-webui/command.php
@@ -1,16 +1,48 @@
 <?php
+require_once("vendor/autoload.php");
 
-define("FIFO", "/tmp/mapid");
+$dotenv = Dotenv\Dotenv::createImmutable(__DIR__ . "/..");
+$dotenv->load();
 
+//define("FIFO", "/tmp/mapid");
+define("FIFO", $_ENV['FIFO']);
 
-if (!file_exists(FIFO))
-	die("<!DOCTYPE html>\n<meta charset=\"UTF-8\">\n<h3 style=\"color:red;\">Error: FIFO file “" . FIFO . "” does not exist!</h3><p>Is <tt>fifo_bridge.py</tt> running?</p>");
+if (!file_exists(FIFO)) {
+	$ErrorDoc = <<<EOT
+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<meta charset="UTF-8">
+	</head>
+	<body>
+		<h3 style="color:red;">Error: FIFO file “%FIFO%” does not exist!</h3>
+		<p>
+			Is <tt>fifo_bridge.py</tt> running?
+		</p>
+		<p>
+			<a href="./">
+				<button>
+					Return
+				</button>
+			</a>
+		</p>
+	</body>
+</html>
+EOT;
+	$ErrorDoc = str_replace("%FIFO%", FIFO, $ErrorDoc);
+	die($ErrorDoc);
+}
 
 
 $f = fopen(FIFO, "w+");
 
-if (count($_POST) == 0)
+if (count($_POST) == 0) {
+	/**
+	 * Support httpie like this:
+	 *   http --print=HBhb POST mcp.local:8080/~malte70/mapid-fifo-webui/command.php cmd=cls
+	 */
 	$_POST = json_decode(file_get_contents('php://input'), true);
+}
 
 switch (@$_POST["cmd"]) {
 	case "getty":
@@ -43,11 +75,11 @@ switch (@$_POST["cmd"]) {
 		fwrite($f, "CLS\n");
 		fwrite($f, "LINE 1\n");
 		fwrite($f, "ECHO ");
-		fwrite($f, $_POST["line1"]);
+		fwrite($f, substr($_POST["line1"], 0, 16));
 		fwrite($f, "\n");
 		fwrite($f, "LINE 2\n");
 		fwrite($f, "ECHO ");
-		fwrite($f, $_POST["line2"]);
+		fwrite($f, substr($_POST["line2"], 0, 16));
 		break;
 }
 
diff --git a/fifo-webui/composer.json b/fifo-webui/composer.json
new file mode 100644
index 0000000..cfccd7d
--- /dev/null
+++ b/fifo-webui/composer.json
@@ -0,0 +1,5 @@
+{
+    "require": {
+        "vlucas/phpdotenv": "^5.5"
+    }
+}
