Many times you may want to provide functionality for your application that works at a
low level with XML messages. This commonly occurs through functionality referred to as
Handlers or Interceptors. Handlers/Interceptors are useful for:
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Performing authentication based on Headers
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Processing custom headers
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Transforming a message (i.e. via XSLT or GZip)
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Redirecting a message
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Getting access to the raw I/O or XML stream