diff --git a/Code/Lib/Activity.php b/Code/Lib/Activity.php
index 7cb2965a3..614600019 100644
--- a/Code/Lib/Activity.php
+++ b/Code/Lib/Activity.php
@@ -122,8 +122,16 @@ class Activity
 
         logger('fetch_actual: ' . $url, LOGGER_DEBUG);
 
+        $default_accept_header = 'application/activity+json, application/x-zot-activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
+        
+        if ($channel) {
+            $accept_header = PConfig::Get($channel['channel_id'],'system','accept_header');
+        }
+        if (!$accept_header) {
+            $accept_header = Config::Get('system', 'accept_header', $default_accept_header);
+        }
         $headers = [
-            'Accept' => 'application/activity+json, application/x-zot-activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+            'Accept' => $accept_header,
             'Host' => $parsed['host'],
             'Date' => datetime_convert('UTC', 'UTC', 'now', 'D, d M Y H:i:s \\G\\M\\T'),
             '(request-target)' => 'get ' . get_request_string($url)
diff --git a/Code/Lib/ActivityStreams.php b/Code/Lib/ActivityStreams.php
index 0e8f3a119..b3713593f 100644
--- a/Code/Lib/ActivityStreams.php
+++ b/Code/Lib/ActivityStreams.php
@@ -508,13 +508,26 @@ class ActivityStreams
 
     public static function is_as_request() : bool
     {
-        $x = getBestSupportedMimeType([
-            'application/ld+json;profile="https://www.w3.org/ns/activitystreams"',
-            'application/activity+json',
-            'application/ld+json;profile="http://www.w3.org/ns/activitystreams"',
-            'application/ld+json',
-            'application/x-zot-activity+json'
-        ]);
+        $default_accept_header = 'application/activity+json, application/x-zot-activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
+
+        if ($channel) {
+            $accept_header = PConfig::Get($channel['channel_id'],'system','accept_header');
+        }
+        if (!$accept_header) {
+            $accept_header = Config::Get('system', 'accept_header', $default_accept_header);
+        }
+
+        $x = getBestSupportedMimeType(explode(',', $accept_header));
+
+        if (! $x) {
+            $x = getBestSupportedMimeType([
+                'application/ld+json;profile="https://www.w3.org/ns/activitystreams"',
+                'application/activity+json',
+                'application/ld+json;profile="http://www.w3.org/ns/activitystreams"',
+                'application/ld+json',
+                'application/x-zot-activity+json'
+            ]);
+        }
 
         return (bool)$x;
     }
diff --git a/Code/Lib/Libzot.php b/Code/Lib/Libzot.php
index 4aef43360..c90d118c4 100644
--- a/Code/Lib/Libzot.php
+++ b/Code/Lib/Libzot.php
@@ -3238,10 +3238,22 @@ class Libzot
 
     public static function is_nomad_request()
     {
-        $x = getBestSupportedMimeType([ 'application/x-zot+json', 'application/x-nomad+json' ]);
+        $supportedTypes = explode(',', self::getAccepts());
+        $x = getBestSupportedMimeType($supportedTypes);
         return (($x) ? true : false);
     }
 
+    public static function getAccepts() {
+        $default_accept_header = 'application/x-zot+json,application/x-nomad+json';
+
+        if ($channel) {
+            $accept_header = PConfig::Get($channel['channel_id'],'system','nomad_accept_header');
+        }
+        if (!$accept_header) {
+            $accept_header = Config::Get('system', 'nomad_accept_header', $default_accept_header);
+        }
+        return $accept_header;
+    }
 
     public static function zot_record_preferred($arr, $check = 'hubloc_network')
     {
diff --git a/Code/Lib/Zotfinger.php b/Code/Lib/Zotfinger.php
index 5c76828b1..1b379079d 100644
--- a/Code/Lib/Zotfinger.php
+++ b/Code/Lib/Zotfinger.php
@@ -25,9 +25,10 @@ class Zotfinger
 
         $data = json_encode(['zot_token' => random_string()]);
 
+        $accepts = Libzot::getAccepts();
         if ($channel && $m) {
             $headers = [
-				'Accept' => 'application/x-nomad+json, application/x-zot+json', 
+				'Accept' => $accepts,
 				'Content-Type' => 'application/x-nomad+json',
                 'X-Zot-Token' => random_string(),
                 'Digest' => HTTPSig::generate_digest_header($data),
@@ -37,7 +38,7 @@ class Zotfinger
             $h = HTTPSig::create_sig($headers, $channel['channel_prvkey'], Channel::url($channel), false);
         }
         else {
-            $h = ['Accept: application/x-nomad+json, application/x-zot+json'];
+            $h = ['Accept: ' . $accepts];
         }
 
         $result = [];
diff --git a/Code/Module/Dev/Zot_probe.php b/Code/Module/Dev/Zot_probe.php
index 5efb85152..2adf59063 100644
--- a/Code/Module/Dev/Zot_probe.php
+++ b/Code/Module/Dev/Zot_probe.php
@@ -3,6 +3,7 @@
 namespace Code\Module\Dev;
 
 use App;
+use Code\Lib\Libzot;
 use Code\Lib\Url;
 use Code\Lib\Zotfinger;
 use Code\Web\Controller;
@@ -31,7 +32,8 @@ class Zot_probe extends Controller
 
             $o .= '<pre>' . htmlspecialchars(print_array($x)) . '</pre>';
 
-            $headers = 'Accept: application/x-nomad+json, application/x-zot+json, application/jrd+json, application/json';
+            $accepts = Libzot::getAccepts() . ', application/jrd+json, application/json';
+            $headers = 'Accept: ' . $accepts;
 
             $x = Url::get($resource, ['headers' => [$headers]]);
 
diff --git a/Code/Module/Magic.php b/Code/Module/Magic.php
index d37648b6c..572182794 100644
--- a/Code/Module/Magic.php
+++ b/Code/Module/Magic.php
@@ -3,6 +3,7 @@
 namespace Code\Module;
 
 use App;
+use Code\Lib\Libzot;
 use Code\Web\Controller;
 use Code\Web\HTTPSig;
 use Code\Lib\SConfig;
@@ -95,7 +96,7 @@ class Magic extends Controller
                 $dest = strip_query_param($dest, 'f');
 
                 $headers = [];
-				$headers['Accept'] = 'application/x-nomad+json, application/x-zot+json';
+				$headers['Accept'] = Libzot::getAccepts();
 				$headers['Content-Type'] = 'application/x-nomad+json';
                 $headers['X-Open-Web-Auth'] = random_string();
                 $headers['Host'] = $parsed['host'];
diff --git a/Code/Module/Rpost.php b/Code/Module/Rpost.php
index a91c6c4d3..798893ce1 100644
--- a/Code/Module/Rpost.php
+++ b/Code/Module/Rpost.php
@@ -99,7 +99,7 @@ class Rpost extends Controller
 
             $url = z_root() . '/cloud/' . $channel['channel_address'] . '/' . $r['data']['display_path'];
 
-            if (strpos($r['data']['filetype'], 'video') === 0) {
+            if (str_starts_with($r['data']['filetype'], 'video')) {
                 for ($n = 0; $n < 15; $n++) {
                     $thumb = Linkinfo::get_video_poster($url);
                     if ($thumb) {
@@ -114,7 +114,7 @@ class Rpost extends Controller
                     $s .= "\n\n" . '[zvideo]' . $url . '[/zvideo]' . "\n\n";
                 }
             }
-            if (strpos($r['data']['filetype'], 'audio') === 0) {
+            if (str_starts_with($r['data']['filetype'], 'audio')) {
                 $s .= "\n\n" . '[zaudio]' . $url . '[/zaudio]' . "\n\n";
             }
             if ($r['data']['filetype'] === 'image/svg+xml') {