Cannot POST to WMS with SLD_Body and CQL_FILTER (v2.26.0.0)

[jason-kolbow]

We're leveraging version 2.26.x for Geoserver Cloud and are experiencing the following behaviors when trying to leverage SLD Styling. We are providing the sld body and CQL Filter as a x-form-url-encoded POST with success in version 2.17.x. However when attempting to do so within geoserver-cloud 2.26.x with the following request as POST, utilizing a custom_style.ysld leveraging the sld body documentation for 2.26.x,

API Call without root url, successful 200 for both version=1.1.1 and 1.3.0:

/wms?REQUEST=GetMap&SERVICE=WMS&VERSION=1.13.1&FORMAT=image/png&CRS=EPSG%3A3857&STYLES=style_name_YSLD&LAYER=WORKSPACE:LAYER_NAME

Which responds with

<?xml version="1.0" encoding="UTF-8"?>
<ServiceExceptionReport version="1.3.0" xmlns="http://www.opengis.net/ogc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/ogc https://cng-api.a-np.location360.ag/geoserver-cloud/schemas/wms/1.3.0/exceptions_1_3_0.xsd">
    <ServiceException>Unknown layer: WORKSPACE:LAYER_NAME</ServiceException>
</ServiceExceptionReport>

I have confirmed via the UI that previews for WMS and WFS are working appropriately for our options being utilized (image/png, OpenLayers and application/json respectively)

The following form_data.txt contains 2 key value pairs for CQL_FILTER and SLD_BODY parameters, with a CQL Filter that previously are successful in returning WMS images on Geoserver 2.17.x

[groldan]

I think it's a known problem with the spring cloud gateway double-urlEncoding query parameters... REVISIT