GeoWebCache WMTS GetTile Request with HTTP POST KVP encoding

Question

WMTS specifies GetTile requests using HTTP POST, by simply encoding all request params in the body. Is this supported by GWC, and if so, what headers etc. do I have to set?

I naively tried this:

POST http://myserver.com/services/wmts

service=WMTS
request=GetTile
version=1.0.0
layer=mylayer
format=image%2Fpng
tilecol=12
tilerow=34

Which gives me:

<?xml version="1.0" encoding="UTF-8"?>
<ExceptionReport version="1.1.0" xmlns="http://www.opengis.net/ows/1.1"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.opengis.net/ows/1.1 http://geowebcache.org/schema/ows/1.1.0/owsExceptionReport.xsd">
  <Exception exceptionCode="MissingParameterValue" locator="request">
    <ExceptionText>Missing Request parameter</ExceptionText>
  </Exception>
</ExceptionReport>

Answer 1

If you look in the GetCapabilities response for GeoServer's WMTS service you will see it only advertises GET.

<ows:Operation name="GetTile">
  <ows:DCP>
    <ows:HTTP>
      <ows:Get xlink:href="http://localhost:8080/geoserver/gwc/service/wmts?">
        <ows:Constraint name="GetEncoding">
          <ows:AllowedValues>
            <ows:Value>KVP</ows:Value>
          </ows:AllowedValues>
        </ows:Constraint>
      </ows:Get>
    </ows:HTTP>
  </ows:DCP>
</ows:Operation>