If the field doesn't exist, it will return an empty string and not a @NULL string.
@note
The header is not case-sensitive, i.e. "CONTENT-TYPE" and "content-type"
represent the same header.
*/
If the field doesn't exist, it will return an empty string and not a @NULL string.
@note
The header is not case-sensitive, i.e. "CONTENT-TYPE" and "content-type"
represent the same header.
*/