HTTP streaming is a mechanism for sending
data from a Web server to a Web browser in response to
an event. HTTP Streaming is achieved through several common
In one such mechanism the web server does
not terminate the response to the client after data has
been served. This differs from the typical HTTP cycle
in which the response is closed immediately following
The web server leaves the response open
such that if an event is received, it can immediately
be sent to the client. Otherwise the data would have to
be queued until the client's next request is made to the
web server. The act of repeatedly queing and re-requesting
information is known as a Polling mechanism.
Typical uses for HTTP Streaming include
market data distribution (stock tickers), live chat/messaging
systems, online betting and gaming, sport results, monitoring
consoles and Sensor network monitoring.
MMS - Microsoft Media Services
Microsoft's streaming server uses the
Microsoft Media Services (MMS) protocol (also called NetShow
Services) to transfer unicast data. MMS can be transported
via UDP or TCP. If the Windows Media Player client cannot
negotiate a good connection using MMS over UDP, it will
resort to MMS over TCP. If that fails, the connection
can be made using a modified version of HTTP (always over
TCP). This is not as ideal for streaming as MMS over UDP,
but ensures connectivity nonetheless.
The default port for MMS is 1755.
RTSP - Real Time Streaming Protocol
The Real Time Streaming Protocol (RTSP),
developed by the IETF and published in 1998 as RFC 2326,
is a protocol for use in streaming media systems which
allows a client to remotely control a streaming media
server, issuing VCR-like commands such as "play"
and "pause", and allowing time-based access
to files on a server.
Some RTSP servers use RTP as the transport
protocol for the actual audio/video data. Many RTSP servers
use RealNetworks's proprietary RDT as the transport protocol.
The first version of RealAudio used a
proprietary protocol called PNA or PNM to send streaming
audio data. RealNetworks later switched to the IETF standardized
Real Time Streaming Protocol (RTSP) but they use RTSP
only to manage the connection.
RTMP - Real Time Messaging Protocol
Real Time Messaging Protocol (RTMP) Is
a proprietary protocol developed by Adobe Systems (formerly
developed by Macromedia) that is primarily used with Macromedia
Flash Media Server to stream audio and video over the
internet to the Adobe Flash Player client.
The default connection port is 1935.