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H
H
HQoS
HQoS is an acronym for Hierarchical Quality of Service. It is a method of QoS that can be configured on a
service level.
HTTP
HTTP is an acronym for Hypertext Transfer Protocol. It is a protocol that used to transfer or convey
information on the World Wide Web (WWW).
HTTP defines how messages are formatted and transmitted, and what actions Web servers and browsers
should take in response to various commands. For example, when you enter a URL in your browser, this
actually sends an HTTP command to the Web server directing it to fetch and transmit the requested Web
page. The other main standard that controls how the World Wide Web works is HTML, which covers how Web
pages are formatted and displayed.
Any Web server machine contains, in addition to the Web page files it can serve, an HTTP daemon, a program
that is designed to wait for HTTP requests and handle them when they arrive. The Web browser is an HTTP
client, sending requests to server machines. An HTTP client initiates a request by establishing a
Transmission Control Protocol (TCP) connection to a particular port on a remote host (port 80 by default). An
HTTP server listening on that port waits for the client to send a request message.
HTTPS
HTTPS is an acronym for Hypertext Transfer Protocol over Secure Socket Layer. It is used to indicate a secure
HTTP connection.
HTTPS provides authentication and encrypted communication and is widely used on the World Wide Web for
security-sensitive communication such as payment transactions and corporate log-ons.
HTTPS is really just the use of Netscape's Secure Socket Layer (SSL) as a sublayer under its regular HTTP
application layering. (HTTPS uses port 443 instead of HTTP port 80 in its interactions with the lower layer,
TCP/IP.) SSL uses a 40-bit key size for the RC4 stream encryption algorithm, which is considered an adequate
degree of encryption for commercial exchange.
RocketLinx MP1204-XT User Guide: 2000644 Rev. A
Glossary - 393
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