Method HttpMessagePart() :setHeader() Foundation
Sets the value of a HTTP header element.
:setHeader( <cName>, <cValue> | <aValues> ) --> self
:setParameter() returns the object executing the method.
The method :setHeader() defines the value or values of an HTTP header element. Existing values are replaced by the value or values specified.
If a character string is assigned to the <cValue> parameter, the value of the HTTP header element is changed to the specified string. Alternatively, an array can be passed in <aValues> in which case the header element value is set to the list of character values specified in the array elements.
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