HTTP Header - ntCoent-Length
FYI, HTTP headers from some clients have characters randomly replaced gives other examples of letter transposition in http headers.
The comments in https://basildoncoder.com/blog/turbocharging-net-webservice-clients.html say the jumbled ntCoent-Length header contains the uncompressed size of the response.
You should see the Content-Length is smaller than ntCoent-Length in cases where Content-Encoding:gzip or similar