![]() ![]() Notice that all the parts of the message body are described in this document. The accompanying WSDL that defines the above service looks like this (the details are not important, but the entire document is shown here for completeness): The rest of the elements in this message are described by the WSDL. This contains two required elements: the Header and the Body. As is normal for any XML document, there must be one root element: the Envelope in this case. SOAP is actually agnostic of the underlying transport protocol and can be sent over almost any protocol such as HTTP, SMTP, TCP, or JMS.Īs was already mentioned, the SOAP message itself must be XML-formatted. User-Agent: Apache-HttpClient/4.1.1 (java 1.5)įrom this example we can see the message was sent over HTTP. In programming terms the WSDL can be thought of as a method signature for the web service.Ī sample message exchange looks like the following. The WSDL is often explained as a contract between the provider and the consumer of the service. SOAP relies heavily on XML, and together with schemas, defines a very strongly typed messaging framework.Įvery operation the service provides is explicitly defined, along with the XML structure of the request and response for that operation.Įach input parameter is similarly defined and bound to a type: for example an integer, a string, or some other complex object.Īll of this is codified in the WSDL – Web Service Description (or Definition, in later versions) Language. SOAP – Simple Object Access Protocol – is probably the better known of the two models. Or, check out the SOAP vs REST infographic if that's more your style. This is just the TLDR version, keep reading below to go into more details about the two formats. You can just read a postcard too, while an envelope takes a few extra steps, like opening or unwrapping to access what’s inside. Closer to other Web technologies in design philosophyĪs one REST API tutorial put it: SOAP is like an envelope while REST is just a postcard.Ĭertainly a postcard is faster and cheaper to send than an envelope, but it could still be wrapped within something else, even an envelope.Fast (no extensive processing required). ![]() ![]() Efficient (SOAP uses XML for all messages, REST mostly uses smaller message formats like JSON).Uses easy to understand standards like swagger and OpenAPI Specification 3.0.It has the following advantages when compared to SOAP: REST is easier to use for the most part and is more flexible. Automation when used with certain language products. ![]()
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