This allows for more flexibility when it comes to moving data, content, and media systems and applications.
Like other approaches to delivering APIs, SOAP uses HTTP as a transport, but one of its strengths is that it can also leverage simple mail transport protocol (SMTP), transmission control protocol (TCP), and user data protocol (UDP) to pass messages back and forth. SOAP allows the structure of messages to be augmented and evolved to meet specific requirements. Responses: How each SOAP API response is structured.Įven though SOAP is very strict in its implementation guidelines, it is also known for being extensible.Requests: How each SOAP API request is structured.Encoding: Rules for expressing the type of data.Envelope: Defining the structure of the message.SOAP uses XML as the data format for messages being sent and received by an API client, and it provides four distinct dimensions to the API protocol: Simply put, using SOAP when designing APIs focuses on the message, whereas using REST when designing APIs focuses on defining them as resources. While REST is more of a style, SOAP gives you much more guidance on the structure of the request and response, as well as the message content and how it will be encoded. It was introduced just as the web was maturing, and while it does use HTTP primarily as a transport for the messages being passed around, its architectural patterns are not as closely aligned with HTTP as REST SOAP can also employ other protocols. SOAP was a standard that emerged in the late 1990s to give businesses the ability to move data around between corporate networks. (Learn more fundamentals by reading our What Is an API? and What Is a REST API? intro posts.) It is older, established, and dependable-but it can be slower than competing architectural styles like REST. Think of SOAP as being like the national postal service: It provides a reliable and trusted way to send and receive messages between systems (and within enterprise applications). When it comes to application programming interfaces ( APIs), a SOAP API is developed in a more structured and formalized way. Simple Object Access Protocol (SOAP) is a message specification for exchanging information between systems and applications.
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