Swift

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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Swift


func chilkatTest() {
    //  Demonstrates the RemoveHeaderField method, which removes by name all occurrences of a
    //  header field.  Header-field names are case-insensitive.

    let email = CkoEmail()!
    email.subject = "Remove header field"
    email.from = "alice@example.com"

    email.addHeaderField(fieldName: "X-Custom-Header", fieldValue: "some value")

    //  Use HasHeaderMatching to test for the header's presence.  ("*" matches any value.)
    var hasBefore: Bool = email.hasHeader(matching: "X-Custom-Header", valuePattern: "*", caseInsensitive: false)
    print("Has X-Custom-Header before: \(hasBefore)")

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

    var hasAfter: Bool = email.hasHeader(matching: "X-Custom-Header", valuePattern: "*", caseInsensitive: false)
    print("Has X-Custom-Header after: \(hasAfter)")

}