Hide default port in local URL behind a reverse proxy

application/HttpUtils.php

@@ -297,9 +297,17 @@ function server_url($server)
             // Keep forwarded port
             if (strpos($server['HTTP_X_FORWARDED_PORT'], ',') !== false) {
                 $ports = explode(',', $server['HTTP_X_FORWARDED_PORT']);
-                $port = ':' . trim($ports[0]);
+                $port = trim($ports[0]);
             } else {
-                $port = ':' . $server['HTTP_X_FORWARDED_PORT'];
+                $port = $server['HTTP_X_FORWARDED_PORT'];
+            }
+
+            if (($scheme == 'http' && $port != '80')
+                || ($scheme == 'https' && $port != '443')
+            ) {
+                $port = ':' . $port;
+            } else {
+                $port = '';
             }
         }
 

tests/HttpUtils/ServerUrlTest.php

@@ -68,6 +68,19 @@ public function testHttpsProxyForward()
             )
         );
 
+        $this->assertEquals(
+            'https://host.tld',
+            server_url(
+                array(
+                    'HTTPS' => 'Off',
+                    'SERVER_NAME' => 'host.tld',
+                    'SERVER_PORT' => '80',
+                    'HTTP_X_FORWARDED_PROTO' => 'https',
+                    'HTTP_X_FORWARDED_PORT' => '443'
+                )
+            )
+        );
+
         $this->assertEquals(
             'https://host.tld:4974',
             server_url(