Because you requested the table using a browser (rather then an NTRIP Client) it has been returned to you as an HTML page.
SOURCETABLE 200 OK Server: SubCarrier Systems Corp SNIP simpleNTRIP_Caster_[wPRO]R3.21.00/of:Aug 09 2026 Date: Sat, 31 October 2026 05:45:07 UTC Content-Type: text/plain Content-Length: 625 STR;LNDN_MSM7;Islington, London;RTCM 3.2;1006(15), 1008(15), 1013(60), 1033(15), 1077(1), 1087(1), 1097(1), 1127(1), 1230(15);;;SNIP;GBR;51.55;-0.09;1;0;SNIP;none;B;N;14140;none STR;LNDN_RTCM3;London;RTCM 3.0;1004(1), 1006(10), 1008(10), 1012(1), 1033(10);;;SNIP;GBR;51.55;-0.09;1;0;SNIP;none;B;N;2840;none STR;LNDN_SERIAL;London, GreaterLondon;RTCM 3.0;1004(1), 1006(10), 1008(10), 1012(1), 1033(10);;;SNIP;GBR;51.55;-0.09;1;0;SNIP;none;B;N;2720;none STR;SSRA00EUH0;;;PENDING;;;SNIP;XXX;51.55;-0.09;1;0;sNTRIP;none;B;N;0;none NET;SNIP;Aurora RTK;B;N;None;ntrip.aurora-rtk.net:2101;sean@aurora-rtk.net;; ENDSOURCETABLE
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This is a CLOSED NTRIP Caster, you must has a user account and password to access it.