SOAP vs HTTP

Difference Between SOAP vs HTTP

SOAP was originally defined as S- Simple O- Object A-Access P-protocol. It is a protocol specification which is used for exchanging structured information. It is used in the implementation of web services in computer-based networks. SOAP for its message format relies on XML Information set and sometimes relies on other application layer protocols as well, such as Hypertext Transfer Protocol (HTTP) or Simple Mail Transfer Protocol (SMTP). It is used for message negotiation and transmission mainly. SOAP forms the foundation layer of a web services protocol stack.

The HTTP or Hypertext Transfer Protocol (HTTP) is an application protocol which is used for distributed, collaborative and hypermedia information systems. HTTP is widely regarded as the foundation of data communication for the World Wide Web (WWW). Hypertext is a structured text that uses logical links or hyperlinks between those nodes that containing text. HTTP is the protocol for exchanging or transferring hypertext. The standards development of HTTP when it was innovated was coordinated by the Internet Engineering Task Force and the World Wide Web Consortium also called as W3C.

Head To Head Comparison Between SOAP vs HTTP(Infographics)

Below is the top 9 difference between SOAP vs HTTP

Key Differences Between SOAP vs HTTP

Both SOAP vs HTTP are popular choices in the market; let us discuss some of the major Difference Between SOAP vs HTTP

• Users can serve any type of content over HTTP such as HTML, sound, images, video, etc. SOAP is an XML-based encoding of messages as we already know that are typically sent over HTTP, but it could be sent over SMTP or even FTP type protocols as well, although the use of such a system in a production environment is rare.
• HTTP sits on top of TCP/IP and like that SOAP sits on top of HTTP. We can imagine a Layer on top of layers.
• If a SOAP request is looked at, we can see both layers, HTTP headers layer will be at the top, followed by the SOAP message next to it.
• SOAP usually deals with platform-independent data format (e.g. XML) to request and receive data from the application server.
• HTTP handles network level protocol.
• An intuitive analogy to understand the difference would be like below:
  SOAP as the person who packages the shipping box.
  HTTP as the delivery truck that delivers the package.
• HTTP protocol consists of two elements: HTTP header and HTTP body. when HTTP body consists of pure XML document only and nothing else then it is called as Plain HTTP however in case of SOAP format the HTTP Body contains SOAP header in addition with soap body which is collectively known as SOAP envelope and such envelope also supports attachments too.
• HTTP URL: Example of http URL is as below.

http://host:port/abc/xi/adapter_plain?service=BS_A&namepsace=http_test&interface=SI_A

• SOAP URL: Example of SOAP URL is as below

http://host:port/XISOAPAdapter/MessageServlet?channel=party:service:channel

• A SOAP message usually will be bundled within the soap envelope. HTTP does not act as an adapter in adapter engine, but soap is actually an adapter i.e. HTTP doesn’t require a communication channel for its communication, but SOAP requires that. Users can send soap messages using the SOAP client.
• When a user needs to send his/her Data to XI from a Webservice, user’s SOAP adapter is used.

HTTP adapter is used when a user wants to post an HTTP request message from a web application to XI so there is an important difference there.

Example: <i>How can I make use of SOAP Sender Adapter without using any tools like XML Spy etc….</i>

• XML SPy is used as a TEST tool most often when users send SOAP information to XI. To actually send data however user needs to configure a web service first and then construct a SOAP request message and after that post the data.
• The SOAP sender adapter is an extraction for the XML message from the whole SOAP envelope message itself. Users can achieve the same using HTTP adapter as well and a suitable mapping thereof. The HTTP adapter is better performing and stable compared to SOAP because only the ABAP part of WAS is used in this, also called as the native adapter.

SOAP vs HTTP Comparison Table

Below is the 9 topmost comparison between SOAP vs HTTP

Conclusion – SOAP vs HTTP

SOAP messages are most often formatted in XML and are usually sent using HTTP. SOAP uses WSDL method of communication between provider and consumer, on the other hand, REST just uses XML or JSON to send and receive data in most cases. SOAP builds an XML based protocol first and then it uses HTTP on top of it or sometimes TCP/IP too. Thus, through this SOAP vs HTTP article, important differences in SOAP vs HTTP are explained and elaborated.

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