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quested data. It can also act as a web client by sending HTTP, HTTPS, and SMTP requests
to an external web server. This capability in the NW AS ABAP is implemented by Internet
Communication Manager (ICM) and the Internet Communication Framework (ICF).
Internet Communication Manager
Internet Communication Manager is implemented as a stand-alone process and is started
along with other components in the ABAP AS ABAP stack. It can be seen as a process ic-
man for the UNIX system at the operating system level. Browser requests are received by
ICM, and it determines if the requests need to be sent to an ABAP or a Java stack. If the re-
quest is determined to be for the ABAP stack, then it is sent to the work process and the
ICF. If the request is determined to be for the Java stack, then it is sent to the Java server
processes.
The main components of the ICM are threads, memory pipes, connection info, watch
dog, and signal handler. Figure 2-5 shows the components inside ICM.
F IGURE 2-5 ICM components
The function of each of the ICM components is as follows:
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