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From Web Characterization Terminology & Definitions Sheet (1999-05-24) | Glossary for this source
A gateway is an intermediary which acts as a server on behalf of some other server with the purpose of supplying resources or resource manifestations from that other server. Clients using a gateway know the gateway is present but does not know that it is an intermediary.
From Composite Capability/Preference Profiles (CC/PP): Structure and Vocabularies 1.0 (2004-01-15) | Glossary for this source
From Glossary of Terms for Device Independence (2005-01-18) | Glossary for this source
From Web Services Glossary (2004-02-11) | Glossary for this source
An agent that terminates a message on an inbound interface with the intent of presenting it through an outbound interface as a new message. Unlike a proxy, a gateway receives messages as if it were the final receiver for the message. Due to possible mismatches between the inbound and outbound interfaces, a message may be modified and may have some or all of its meaning lost during the conversion process. For example, an HTTP PUT has no equivalent in SMTP.
Note: a gateway may or may not be a SOAP node; however a gateway is never a SOAP intermediary, since gateways terminate messages and SOAP intermediaries relay them instead. Being a gateway is typically a permanent role, whilst being a SOAP intermediary is message specific.
From Hypertext Transfer Protocol -- HTTP/1.1 (1999-06-15) | Glossary for this source
From Glossary of Terms for Device Independence (2005-01-18) | Glossary for this source