HttpListener is a programmatic HTTP protocol listener in System.Net namespace. HTTP servers respond to client requests using web resources or error messages
SOAP faults provide platform-independent error communication in Web services. Faults can be modeled (Java exceptions mapped to WSDL definitions) or unmodeled (runtime exceptions). Faults are returned only in request/response messaging, not in one-way operations
SOAP is a protocol, REST is an architectural style. SOAP clients are tightly coupled to servers, REST clients are browser-like. SOAP requires prior knowledge of all API operations, REST clients need only entry point. REST supports multiple data formats, SOAP only XML
WSDL is Web Services Description Language written in XML. WSDL was recommended by W3C in June 2007. Documents specify service location and methods using XML elements
SOAP is a W3C-recommended application communication protocol based on XML. SOAP enables communication between applications across different platforms and technologies. SOAP messages consist of Envelope, Header, Body, and Fault elements
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