All communication by SOAP is done via the HTTP protocol. SOAP can be used for broadcasting a message. Every Envelope element needs to have at least one soap body element. SOAP is the protocol used for data interchange between applications. In this tutorial, learn what is SOAP, elements of a SOAP message, envelope element, building blocks, communication model and practical SOAP Example. The interesting part you will see now is the 'string' attribute. Normally a class file is used to encapsulate the functionality of a web service. This tells the client application that the web service being called returns an object of the type string. The following points can be noted on the SOAP envelope element. SOAP basics, how it compares to REST, SOAP attachments and how SOAP functions with WSDL will … Prior to SOAP, a lot of web services used the standard RPC (Remote Procedure Call) style for communication. The third part is the element which specifies that we want to call the service which is called 'Guru99WebService.'. Here [WebMethod] is known as an attribute which describes a function. The SOAP Fault message consists of the following elements. In the normal RPC style communication, the client would just call the methods in its request and send the required parameters to the server, and the server would then send the desired response. HTTP remains the most popular SOAP transport protocol. This function is a web service which can be called by any client application. A v1.2-compliant SOAP processor generates a Version Mismatch fault if it receives a message that does not include the v1.2 envelope namespace. A Header element that contains header information – The header element can contain information such as authentication credentials which can be used by the calling application. This is the encapsulating element which is present in every SOAP message. SOAP can be transported via SMTP, FTP, IBM's MQSeries, or Microsoft Message Queuing (MSMQ). This is a brief tutorial that introduces the readers to the fundamentals of SOAP before moving on to explain its various elements, encoding, and how SOAP is transported. It is an XML based protocol that consists of three parts: an envelope that defines a framework for describing what is in a message and how to process it; a set of encoding rules for expressing instances of application-defined data types; and a convention for representing remote … The diagram below shows the various building blocks of a SOAP Message. SOAP is an application of the XML specification. An Envelope element that identifies the XML document as a SOAP message – This is the containing part of the SOAP message and is used to encapsulate all the details in the SOAP message.