From HTTP to SOAP

HTTP
HTTP Header
SOAP Web Service
Simple Object Access Protocol (SOAP)

SOAP stands for Simple Object Access Protocol.

SOAP is a protocol for accessing web services.

SOAP is based on XML.

SOAP examples (source w3cschools)
SOAP code example (source w3cschools)
SOAP Binding example (source w3cschools)
SOAP code example (source wikipedia)