• TCP implementations will follow a general principle of robustness: be conservative in what you do, be liberal in what you accept from others.

    Jon Postel: TCP implementations will follow a general principle of robustness: be conservative in what you do, be liberal in what you accept from others.
    "The Robustness Principle". RFC 793, "Transmission Control Protocol", entire text of section 2.10, www.ietf.org. September 1981.