SOAP message handlers are defined in the webservices.xml deployment descriptor file, which is stored at the web service endpoint. A group of handlers form a handler chain. Each handler contains a method for a SOAP request and a SOAP response.
Handlers intercept either the SOAP request or SOAP response message between the client and the server. Handlers process SOAP header blocks. Handlers accept SOAP header block information as input and modify or add additional information to it. The handlers then forward it along the message path again.
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