Microsoft SM

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Microsoft S+M (Microsoft Speed + Mobility)[1] is an experimental networking protocol developed primarily at Microsoft for transporting web content.[1] Microsoft S+M is similar to HTTP, with particular goals to reduce web page load latency and improve web security. As a revision of Google's SPDY protocol, Microsoft S+M achieves reduced latency through SPDY's use of compression, multiplexing, and prioritization.[2]

Relation to HTTP[edit]

Microsoft S+M, being built on SPDY, does not replace HTTP. Rather, it modifies the way HTTP requests and responses are sent over the wire;[2] this means that all the existing server-side applications can be used without modification if a SPDY-compatible translation layer is put in place. When sent over SPDY, the HTTP requests are processed, tokenized, simplified and compressed. For example, each SPDY end-point keeps track of which headers have been sent in the past requests and can avoid resending the headers that have not changed; those that must be sent are sent compressed.

In developing HTTP Speed+Mobility, Microsoft built upon both Google's proven SPDY protocol and on WebSocket, which is a web technology providing for bi-directional, full-duplex communications channels over a single TCP connection.

Besides support of the framing of WebSockets, changes from SPDY include the following: taking mobile phones and other low-power devices into account and the removal of SPDY’s obligatory use of CPU-intensive features—encryption, compression, and server-side push.[3][4][5]

The IETF working group for HTTPbis has begun working on HTTP/2[6] and chose SPDY as the starting point.

See also[edit]

References[edit]

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