127.0.0.1 is local host, meaning, if that was shown in your browser console, that was occurring on your PC/browser. If it was the scope, it would have shown the scope's IP address.
Nope it was the html response with code 200 from the scope.

That localhost ip is part of the message from the scope.
{"success":true}\r\n{"retCount":1}\r\n{"cmdrslt":"uart,rx,rx_err;\nuart,tx,tx_err;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n,Over Length;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x00,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0x80,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0,;\n0xC0d1","from":"127.0.0.1"}\r\n