SOAP was developed with messaging in mind, the vast majority of the Web service applications use HTTP as the transport protocol. HTTP is a natural choice because it is the most commonly used protocol on the Web and can sneak through firewalls. However, HTTP is the HyperText Transfer Protocol—it was designed to allow users with Web browsers to retrieve documents over the Internet, not for applications to communicate with each other. HTTP is inherently unreliable and designed for synchronous document retrieval—the client application uses the same connection for sending the request to the server
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