B4X

Add a MIME Header Field

Demonstrates the Chilkat Mime.AddHeaderField method, which appends a new header field. The first argument is the field name and the second is the value. Existing fields with the same case-insensitive name are preserved, so this can create duplicates.

Background: MIME headers are ordered name/value lines, and some — Received, for instance — legitimately appear more than once. AddHeaderField is the tool for that: it always appends, never replacing an existing field of the same name. When you instead want exactly one field with a given name, use SetHeaderField, which replaces rather than accumulates.

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Dim success As Boolean = False

'  Demonstrates the Mime.AddHeaderField method, which appends a new header field.  The 1st argument
'  is the field name and the 2nd is the value.  Existing fields with the same (case-insensitive)
'  name are preserved, so this can create duplicate fields.

Dim mime As ChilkatMime
mime.Initialize

success = mime.SetBodyFromPlainText("Hello.")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


'  Append header fields.  AddHeaderField does not replace existing fields of the same name.
success = mime.AddHeaderField("X-Custom-Header", "value1")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If

success = mime.AddHeaderField("X-Priority", "3")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


Dim headers As String = mime.GetEntireHead
If mime.LastMethodSuccess = False Then
    Log(mime.LastErrorText)
    Return
End If

Log(headers)