The Spotify Windows version 220.127.116.11.g19de0aa6 don't support
automatic proxy detection when the network uses DHCP WPAD.
The Spotify client should be able to read the proxy configuration when
DHCP Option 252 is used in an corpoate network.
About Implementing WPAD
The Spotify client should download the wpad.dat file,
where Spotify will get the url for where this file is located by reading the DHCP Option 252 (if exist) when the client is using DHCP. The WPAD.dat contains all ip adresses of the proxy servers and ports to be used and also the adresses that shall be excluded for proxy.
Internet Explorer, Edge and Chrome browser do support DHCP WPAD so that the end user don't need to configure the proxy settings when moving between various nettvork.
Reccomend to implement DNS WPAD also at the same time for corporate networks that uses DNS WPAD.
Marked as new idea.