diff --git a/include/items.php b/include/items.php
index ab2fd644a..7958c78c3 100644
--- a/include/items.php
+++ b/include/items.php
@@ -517,10 +517,10 @@ function dfrn_deliver($contact,$atom,$debugging = false) {
 	if($contact['duplex'] && $contact['issued-id'])
 		$idtosend = '1:' . $orig_id;		
 
-	$url = $contact['notify'] . '?dfrn_id=' . $idtosend;
+	$url = $contact['notify'] . '?dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION ;
 
 	if($debugging)
-		echo "URL: $url";
+		echo "URL: $url\n";
 
 	$xml = fetch_url($url);
 
@@ -560,8 +560,8 @@ function dfrn_deliver($contact,$atom,$debugging = false) {
 		return 3;
 	}
 
-	$postvars['dfrn_id'] = $idtosend;
-
+	$postvars['dfrn_id']      = $idtosend;
+	$postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
 
 	if(($contact['rel']) && ($contact['rel'] != REL_FAN) && (! $contact['blocked']) && (! $contact['readonly'])) {
 		$postvars['data'] = $atom;
diff --git a/include/poller.php b/include/poller.php
index ff141484b..bf2803b63 100644
--- a/include/poller.php
+++ b/include/poller.php
@@ -94,12 +94,15 @@
 		if(intval($contact['duplex']) && $contact['issued-id'])
 			$idtosend = '1:' . $orig_id;		
 
-		$url = $contact['poll'] . '?dfrn_id=' . $idtosend . '&type=data&last_update=' . $last_update ;
+		$url = $contact['poll'] . '?dfrn_id=' . $idtosend 
+			. '&dfrn_version=' . DFRN_PROTOCOL_VERSION 
+			. '&type=data&last_update=' . $last_update ;
+
 		$xml = fetch_url($url);
 
 		if($debugging) {
-			echo "URL: " . $url . "\r\n";
-			echo "XML: " . $xml . "\r\n";
+			echo "URL: " . $url . "\n";
+			echo "XML: " . $xml . "\n";
 		}
 
 		if(! $xml) {
@@ -154,7 +157,7 @@
 		}
 
 		$postvars['dfrn_id'] = $idtosend;
-
+		$postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
 
 		$xml = post_url($contact['poll'],$postvars);
 
diff --git a/mod/dfrn_confirm.php b/mod/dfrn_confirm.php
index 265a62b88..3df36182e 100644
--- a/mod/dfrn_confirm.php
+++ b/mod/dfrn_confirm.php
@@ -109,7 +109,7 @@ function dfrn_confirm_post(&$a) {
 			$params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
 		}
 
-		$params['dfrn_version'] = '2.0';
+		$params['dfrn_version'] = DFRN_PROTOCOL_VERSION ;
 		if($duplex == 1)
 			$params['duplex'] = 1;
 
diff --git a/mod/dfrn_notify.php b/mod/dfrn_notify.php
index 4a23da505..5779b68d2 100644
--- a/mod/dfrn_notify.php
+++ b/mod/dfrn_notify.php
@@ -7,6 +7,7 @@ require_once('include/items.php');
 function dfrn_notify_post(&$a) {
 
 	$dfrn_id = notags(trim($_POST['dfrn_id']));
+	$dfrn_version = (float) $_POST['dfrn_version'];
 	$challenge = notags(trim($_POST['challenge']));
 	$data = $_POST['data'];
 
@@ -374,6 +375,8 @@ function dfrn_notify_content(&$a) {
 		// If this is a duplex communication, ours will be the opposite.
 
 		$dfrn_id = notags(trim($_GET['dfrn_id']));
+		$dfrn_version = (float) $_GET['dfrn_version'];
+
 
 		$direction = (-1);
 		if(strpos($dfrn_id,':') == 1) {
@@ -435,7 +438,16 @@ function dfrn_notify_content(&$a) {
 		$challenge    = bin2hex($challenge);
 		$encrypted_id = bin2hex($encrypted_id);
 
-		echo '<?xml version="1.0" encoding="UTF-8"?><dfrn_notify><status>' . $status . '</status><dfrn_version>2.0</dfrn_version><dfrn_id>' . $encrypted_id . '</dfrn_id><challenge>' . $challenge . '</challenge></dfrn_notify>' . "\r\n" ;
+		header("Content-type: text/xml");
+
+		echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n" 
+			. '<dfrn_notify>' . "\r\n"
+			. "\t" . '<status>' . $status . '</status>' . "\r\n"
+			. "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
+			. "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n" 
+			. "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
+			. '</dfrn_notify>' . "\r\n" ;
+
 		killme();
 	}
 
diff --git a/mod/dfrn_poll.php b/mod/dfrn_poll.php
index a65f6555d..f5a761983 100644
--- a/mod/dfrn_poll.php
+++ b/mod/dfrn_poll.php
@@ -14,7 +14,7 @@ function dfrn_poll_init(&$a) {
 		$type = $_GET['type'];
 	if(x($_GET,'last_update'))
 		$last_update = $_GET['last_update'];
-	$dfrn_version    = ((x($_GET,'dfrn_version'))    ? $_GET['dfrn_version']    : '1.0');
+	$dfrn_version    = (float) $_GET['dfrn_version'] ;
 	$destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url'] : '');
 
 
@@ -115,11 +115,12 @@ function dfrn_poll_init(&$a) {
 
 function dfrn_poll_post(&$a) {
 
-	$dfrn_id = $_POST['dfrn_id'];
-	$challenge = $_POST['challenge'];
-	$url = $_POST['url'];
+	$dfrn_id      = $_POST['dfrn_id'];
+	$challenge    = $_POST['challenge'];
+	$url          = $_POST['url'];
+	$dfrn_version = (float) $_POST['dfrn_version'];
 
-	$direction = (-1);
+	$direction    = (-1);
 	if(strpos($dfrn_id,':') == 1) {
 		$direction = intval(substr($dfrn_id,0,1));
 		$dfrn_id = substr($dfrn_id,2);
@@ -199,7 +200,7 @@ function dfrn_poll_post(&$a) {
 		</reputation>
 		";
 		killme();
-		return; // NOTREACHED
+		// NOTREACHED
 	}
 	else {
 		$o = get_feed_for($a,$dfrn_id, $a->argv[1], $last_update, $direction);
@@ -222,6 +223,8 @@ function dfrn_poll_content(&$a) {
 	if(x($_GET,'last_update'))
 		$last_update = $_GET['last_update'];
 
+	$dfrn_version = (float) $_GET['dfrn_version'];
+
 	$direction = (-1);
 	if(strpos($dfrn_id,':') == 1) {
 		$direction = intval(substr($dfrn_id,0,1));
@@ -293,11 +296,15 @@ function dfrn_poll_content(&$a) {
 		else {
 			$status = 1;
 		}
-
-		echo '<?xml version="1.0" encoding="UTF-8"?><dfrn_poll><status>' .$status . '</status><dfrn_version>2.0</dfrn_version><dfrn_id>' . $encrypted_id . '</dfrn_id>'
-			. '<challenge>' . $challenge . '</challenge></dfrn_poll>' . "\r\n" ;
-		session_write_close();
-		exit;		
+		header("Content-type: text/xml");
+		echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
+			. '<dfrn_poll>' . "\r\n"
+			. "\t" . '<status>' .$status . '</status>' . "\r\n"
+			. "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
+			. "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
+			. "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
+			. '</dfrn_poll>' . "\r\n" ;
+		killme();
 	}
 }
 
diff --git a/mod/dfrn_request.php b/mod/dfrn_request.php
index f6a85fbab..3c16e2560 100644
--- a/mod/dfrn_request.php
+++ b/mod/dfrn_request.php
@@ -197,7 +197,7 @@ function dfrn_request_post(&$a) {
 		}
 
 
-		if($network == 'dfrn') {
+		if($network === 'dfrn') {
 			$ret = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' LIMIT 1", 
 				intval($uid),
 				dbesc($url)