Fix error receiving local file URL response

CHANGELOG.md

@@ -26,6 +26,10 @@
 
   By default, the source is not volatile.
 
+### Bug fixes
+
+- [ios, macos] Fixed error receiving local file URL response ([#16428](https://github.com/mapbox/mapbox-gl-native/pull/16428))
+
 ## maps-v1.6.0-rc.1
 
 ### ✨ New features

platform/darwin/src/http_file_source.mm

@@ -371,6 +371,8 @@ BOOL isValidMapboxEndpoint(NSURL *url) {
                             std::make_unique<Error>(Error::Reason::Other, std::string{ "HTTP status code " } +
                                                                               std::to_string(responseCode));
                     }
+                } else if ([url isFileURL]) {
+                    response.data = std::make_shared<std::string>((const char *)[data bytes], [data length]);
                 } else {
                     // This should never happen.
                     response.error = std::make_unique<Error>(Error::Reason::Other,