class type mime_header_ro =object..end
This is the read-only version of a MIME header. There are only methods to read the header fields.
method fields : (string * string) list
method field : string -> string
method multiple_field : string -> string listThe current fields of the header. fields returns the complete
 header. field name returns the value of the field, or raises
 Not_found. multiple_field name returns all fields with the same
 name.
Note that field names are case-insensitive; field "content-length",
 and field "CONTENT-LENGTH" will return the same field. However,
 the method fields returns the original field names, without
 adjustment of the case.
The order of the fields is preserved.
content_length, content_type,
      content_dispositions and content_transfer_encoding have been
      moved to Netmime_header.