Java

Remove a Header Field from an Email

Demonstrates the Chilkat Email.RemoveHeaderField method, which removes by name all occurrences of a header field. Header-field names are case-insensitive, and every repeated occurrence with the given name is removed. This example adds a custom header, then removes it.

Background: Editing a message sometimes means deleting a header outright — stripping a tracking header, removing an X- flag before forwarding, or clearing a stale field before re-sending. Because a field name can appear more than once (like Received), RemoveHeaderField removes all matching occurrences in one call rather than just the first.

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import com.chilkatsoft.chilkat2.Email;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the RemoveHeaderField method, which removes by name all occurrences of a
        // header field.  Header-field names are case-insensitive.

        Email email = new Email();
        email.setSubject("Remove header field");
        email.setFrom("alice@example.com");

        email.addHeaderField("X-Custom-Header", "some value");

        // Use HasHeaderMatching to test for the header's presence.  ("*" matches any value.)
        boolean hasBefore = email.hasHeaderMatching("X-Custom-Header", "*", false);
        System.out.println("Has X-Custom-Header before: " + hasBefore);

        // Remove all occurrences of the header field.
        email.removeHeaderField("X-Custom-Header");

        boolean hasAfter = email.hasHeaderMatching("X-Custom-Header", "*", false);
        System.out.println("Has X-Custom-Header after: " + hasAfter);
    }
}