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Manual Reference Pages  -  MIME::FIELD::CONTTYPE (3)

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MIME::Field::ContType - a "Content-type" field



A subclass of Mail::Field.

Don’t use this class directly... its name may change in the future! Instead, ask Mail::Field for new instances based on the field name!


    use Mail::Field;
    use MIME::Head;

    # Create an instance from some text:
    $field = Mail::Field->new(Content-type,
                              text/HTML; charset="US-ASCII");

    # Get the MIME type, like text/plain or x-foobar.
    # Returns text/plain as default, as per RFC 2045:
    my ($type, $subtype) = split(/, $field->type);

    # Get generic information:
    print $field->name;

    # Get information related to "message" type:
    if ($type eq message) {
        print $field->id;
        print $field->number;
        print $field->total;

    # Get information related to "multipart" type:
    if ($type eq multipart) {
        print $field->boundary;            # the basic value, fixed up
        print $field->multipart_boundary;  # empty if not a multipart message!

    # Get information related to "text" type:
    if ($type eq text) {
        print $field->charset;      # returns us-ascii as default


boundary Return the boundary field. The boundary is returned exactly as given in the Content-type: field; that is, the leading double-hyphen (--) is not prepended.

(Well, almost exactly... from RFC 2046:

   (If a boundary appears to end with white space, the white space
   must be presumed to have been added by a gateway, and must be deleted.)

so we oblige and remove any trailing spaces.)

Returns the empty string if there is no boundary, or if the boundary is illegal (e.g., if it is empty after all trailing whitespace has been removed).

multipart_boundary Like boundary(), except that this will also return the empty string if the message is not a multipart message. In other words, there’s an automatic sanity check.
type Try real hard to determine the content type (e.g., "text/plain", "image/gif", "x-weird-type", which is returned in all-lowercase.

A happy thing: the following code will work just as you would want, even if there’s no subtype (as in "x-weird-type")... in such a case, the $subtype would simply be the empty string:

    ($type, $subtype) = split(/, $head->mime_type);

If the content-type information is missing, it defaults to "text/plain", as per RFC 2045:

    Default RFC 2822 messages are typed by this protocol as plain text in
    the US-ASCII character set, which can be explicitly specified as
    "Content-type: text/plain; charset=us-ascii".  If no Content-Type is
    specified, this default is assumed.

<B>Note:B> under the be liberal in what we accept principle, this routine no longer syntax-checks the content type. If it ain’t empty, just downcase and return it.


Since nearly all (if not all) parameters must have non-empty values to be considered valid, we just return the empty string to signify missing fields. If you need to get the real underlying value, use the inherited param() method (which returns undef if the parameter is missing).


MIME::Field::ParamVal, Mail::Field


Eryq (, ZeeGee Software Inc ( Dianne Skoll (
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perl v5.20.3 MIME::FIELD::CONTTYPE (3) 2015-09-30

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