There are two approaches to developing a web service, depending on whether you define the contract first or last.

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The two approaches to developing a web service are Contract-First and Contract-Last. In the Contract-First approach, the service contract (WSDL for SOAP services, or an OpenAPI specification for REST services) is defined before any code is written. In the Contract-Last approach, the contract is generated from the code after the service is implemented.

There Are Two Approaches to Developing a Web Service, Depending