How Do I Get the HTTP Request's HTTP Verb? (Magic xpi 4.9)
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In the mgreq.ini file, found under the <Magic xpi installation>/Runtime/scripts/config folder, enable the HttpVars parameter and add the variable REQUEST_METHOD to it.

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Restart the IIS.
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In the flow containing the HTTP trigger, use the following expression in a Flow Data utility's Update Expression column to receive the verb: GetParam ('REQUEST_METHOD')

 
When running the project, you will get values such as GET, POST, PUT, DELETE, and HEAD.