diff --git a/lizmap/modules/lizmap/lib/Request/OGCRequest.php b/lizmap/modules/lizmap/lib/Request/OGCRequest.php
index b279943614..92b7ec7e90 100644
--- a/lizmap/modules/lizmap/lib/Request/OGCRequest.php
+++ b/lizmap/modules/lizmap/lib/Request/OGCRequest.php
@@ -247,9 +247,14 @@ protected function logRequestIfError($code, $headers)
 
         $message = 'The HTTP OGC request to QGIS Server ended with an error.';
 
-        $xRequestId = $headers['X-Request-Id'] ?? '';
-        if ($xRequestId !== '') {
-            $message .= ' The X-Request-Id `'.$xRequestId.'`.';
+        if (isset($headers['X-Request-Id'])) {
+            if (is_array($headers['X-Request-Id'])) {
+                $xRequestId = implode(',', $headers['X-Request-Id']);
+            } else {
+                $xRequestId = $headers['X-Request-Id'];
+            }
+        } else {
+            $xRequestId = '';
         }
 
         // The master error with MAP parameter
diff --git a/lizmap/modules/lizmap/lib/Request/Proxy.php b/lizmap/modules/lizmap/lib/Request/Proxy.php
index f855ca55bf..9f1d93c557 100644
--- a/lizmap/modules/lizmap/lib/Request/Proxy.php
+++ b/lizmap/modules/lizmap/lib/Request/Proxy.php
@@ -310,11 +310,14 @@ protected static function buildHeaders($url, $options)
         ), $options['headers']);
 
         if (strpos($url, self::$services->wmsServerURL) === 0) {
-            // headers only for QGIS server
+            // Headers only for QGIS server
+            parse_str(parse_url($options['headers']['X-Qgis-Service-Url'], PHP_URL_QUERY), $output);
+            $requestId = $output['repository'].'-'.$output['project'];
+            $requestId .= '-'.uniqid().'-'.bin2hex(random_bytes(10));
             $options['headers'] = array_merge(
                 self::userHttpHeader(),
                 self::$services->wmsServerHeaders,
-                array('X-Request-Id' => uniqid().'-'.bin2hex(random_bytes(10))),
+                array('X-Request-Id' => $requestId),
                 $options['headers']
             );
         }
@@ -339,7 +342,16 @@ protected static function logRequestIfError($httpCode, $url, $headers = array())
             return;
         }
 
-        $xRequestId = $headers['X-Request-Id'] ?? '';
+        if (isset($headers['X-Request-Id'])) {
+            if (is_array($headers['X-Request-Id'])) {
+                $xRequestId = implode(',', $headers['X-Request-Id']);
+                $xRequestId = json_encode($headers['X-Request-Id']);
+            } else {
+                $xRequestId = $headers['X-Request-Id'];
+            }
+        } else {
+            $xRequestId = '';
+        }
 
         $lizmapAdmin = 'An HTTP request ended with an error, please check the main error log.';
         $lizmapAdmin .= ' HTTP code '.$httpCode.'.';
diff --git a/tests/units/classes/Request/ProxyTest.php b/tests/units/classes/Request/ProxyTest.php
index 765395b731..e5c2c5b654 100644
--- a/tests/units/classes/Request/ProxyTest.php
+++ b/tests/units/classes/Request/ProxyTest.php
@@ -240,6 +240,7 @@ public function testBuildHeaders($options, $expectedHeaders, $expectedBody, $exp
             $this->assertEquals($value, $result['headers'][$header]);
         }
         $this->assertArrayHasKey('X-Request-Id', $result['headers']);
+        $this->assertIsString($result['headers']['X-Request-Id']);
         $this->assertEquals($expectedBody, $result['body']);
         if ($expectedUrl) {
             $this->assertEquals($expectedUrl, $url);