App does not send POST request to localhost

[mpenkala]

When I define POST request to https://localhost:55030/api/order/ext app write "The requested URL can't be reached" and send nothing (request not shown in history). When i change address to https://customer-devweb.xmarton.com/api/order/ext, it works.
curl "https://localhost:55030/api/order/ext" -X POST -d... from command line works too

Versions

App: 17.0.9
Platform: win32
Electron: 17.1.0
Chrome: 98.0.4758.102
V8: 9.8.177.11-electron.0
Node: 16.13.0