Every time the client sends a request to the server, the HTTP protocol is used. The client can pass additional information about the request, and about the client itself, in request header fields. The function
getHeader() returns the value of a request header field of the current request. You have to specify the name of the desired field as a function attribute. In case the specified header field does not exist, the function returns an empty string. For additional information, consult the HTTP 1.0 specification, available at the World Wide Web Consortium web site,
getHeader( <Key String - operation> )
In this example,
getHeader() returns the value assigned to the header field
<ISPRINT value = "#getHeader('User-Agent')#">
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