Explain this disgusting grue

cli/drivers/ValetDriver.php

@@ -119,8 +119,27 @@ public function mutateUri($uri)
      */
     public function serveStaticFile($staticFilePath, $sitePath, $siteName, $uri)
     {
+        /**
+         * Back story...
+         *
+         * PHP docs *claim* you can set default_mimetype = "" to disable the default
+         * Content-Type header. This works in PHP 7+, but in PHP 5.* it sends an
+         * *empty* Content-Type header, which is significantly different than
+         * sending *no* Content-Type header.
+         *
+         * However, if you explicitly set a Content-Type header, then explicitly
+         * remove that Content-Type header, PHP seems to not re-add the default.
+         *
+         * I have a hard time believing this is by design and not coincidence.
+         *
+         * Burn. it. all.
+         */
         header('Content-Type: text/html');
         header_remove('Content-Type');
+
+        /**
+         * Tell Caddy to handle the static file itself, using it's `internal` feature.
+         */
         header('X-Accel-Redirect: ' . $staticFilePath);
     }