REST vs SOAP
- REST: REpresentational State Transfer
- SOAP: Simple Object Access Protocol
Here are some key differences between the 2:
- Underlying protocol: REST uses HTTP/HTTPS, SOAP can use (almost) anything, like HTTP/HTTPS/SMTP, etc
- SOAP uses XML, strict contract in the form of WSDL. REST has no limits and contracts, light weight comparing to SOAP.
- REST is stateless; SOAP supports stateful calls.
- REST response can be cached(GET requests); SOAP cannot.
- REST is easier to develop comparing to SOAP
To summarize, the root cause of SOAP's problems and unpopularity: XML