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If a header field is multi-valued, then the routine is called once for each value.
The field name passed to the callback routine has case as suggested by HTTP spec, and the headers will be visited in the recommended "Good Practice" order.
This function removes the header fields with the specified names.
In scalar context return the number of distinct field names. The callback routine is called with two parameters; the name of the field and a single value (a string).
The $value argument may be a plain string or a reference to an array of strings for a multi-valued field. A multi-valued field will be returned as separate values in list context and will be concatenated with ", " as separator in scalar context.