AppServers, Grid, SOA, JEE, etc.

Here are roughly summarized the key differences between RESTful and RESTless web services (it does not have to be strictly valid):
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1. Protocol
RESTful services use REST architectural style,
RESTless services use SOAP protocol.
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2. Business logic / Functionality
RESTful services use URL to expose business logic,
RESTless services use the service interface to expose business logic.
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3. Security
RESTful inherits security from the underlying transport protocols,
RESTless defines its own security layer, thus it is considered as more secure.
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4. Data format
RESTful supports various data formats such as HTML, JSON, text, etc,
RESTless supports XML format.
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5. Flexibility
RESTful is easier and flexible,
RESTless is not as easy and flexible.
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6. Bandwidth
RESTful services consume less bandwidth and resource,
RESTless services consume more bandwidth and resources.

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