tcp:

tcp: URL scheme

[3] W3CLIST にも掲載されています。

[1] tcp://host.dom:21

Appendix 1 - Values <http://www.rebol.com/docs/core23/rebolcore-16.html#section-2.13.2>

[2] FFmpeg Protocols Documentation () <https://ffmpeg.org/ffmpeg-protocols.html#tcp>

Transmission Control Protocol.

The required syntax for a TCP url is:

tcp://hostname:port[?options]

options contains a list of &-separated options of the form key=val.