Chapter 11. Exposing Legacy Components as Web Services

A Web service is a collection of functions that are packed together as a single entity and exposed to the network for use by other programs over the Internet. In other words, it is a Uniform Resource Locator (URL)-addressable resource that programmatically returns information to clients. Web services can be considered as building blocks for creating distributed systems over the Internet. Some examples of Web services are

  • A credit-checking service that returns credit information against a social security number.

  • A stock quote service that returns the stock price associated with a specified ticker symbol.

  • A purchasing service that allows purchase of supplies against an item code and quantity.

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