> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Appkit SDK 4.9.0 Release Notes

[localhost link]: http://localhost:3000/docs/4/app-studio/release-notes/appkit/4.9.0-release-notes

[mintlify link]: https://doc.lucidworks.com/docs/4/app-studio/release-notes/appkit/4.9.0-release-notes

[old doc.lw link]: https://doc.lucidworks.com/app-studio/4.2/986

**Release date:** 10 February 2020

## Bug Fixes

* The `FusionProxy` endpoint `/twigkit/api/fusion/*` now accepts nested URI paths as expected. For example:

  ```
  /insights/twigkit/api/fusion/collections/<collection_name>
  /insights/twigkit/api/fusion/apps/<app_name>/experiments

  ```

  Previously, an `HTTP 400` error occurred.

* Removing filters using the `<query:filter action="remove">` tag will no longer remove filters added with the `<query:filter value="bar">` tag. For example, the following will leave the filter on `value="bar"` intact:

  ```
  <search:query var="query">
       <query:filter field="foo" value="bar">
       <query:filter field="foo" action="remove">
  </search:query>

  ```

* Previously, using the Solr platform in compatibility mode forced exclusive boundaries on date range filters to become inclusive. This affected date range filters in the Fusion platform.\
  This behavior is fixed. Exclusive boundaries on range filters now remain exclusive in compatibility mode.

* Toggle events now fire as expected when using toggle controls.