The Test Header Match request selector is implemented by the com.arbortext.e3.TestHeaderMatch class. It evaluates an HTTP request and returns true if the request includes an HTTP header with a specific value. It accepts two parameters, header-name, which specifies the name of the HTTP header to test and header-pattern, which specifies a pattern that the HTTP header value must match.

The Test Header Match request selector accepts standard Java patterns for its header-pattern parameter. So, for example patterns like text/* or text/??? would both match a header value of text/xml. You can specify a Java pattern without wildcards, so specifying a pattern like text/html would test for a header value equal to text/html.