Classic ASP

Set a MIME Header Field

Demonstrates the Chilkat Mime.SetHeaderField method, which sets a single header field. The first argument is the field name and the second is the value. All existing occurrences are removed and one replacement is inserted, or a new field is added if none exists.

Background: For headers that should appear exactly once — Subject, From, Content-Type — this is the method to use, because it guarantees a single occurrence no matter how many times you call it. That idempotence is the key difference from AddHeaderField, which would leave duplicates behind. Setting an empty value removes the field.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

'  Demonstrates the Mime.SetHeaderField method, which sets a single header field.  The 1st argument
'  is the field name and the 2nd is the value.  All existing occurrences are removed and one
'  replacement is inserted (or a new field is added if none exists).

set mime = Server.CreateObject("Chilkat.Mime")

success = mime.SetBodyFromPlainText("Hello.")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

'  Unlike AddHeaderField, SetHeaderField ensures exactly one field with this name.
success = mime.SetHeaderField("Subject","Weekly Report")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

'  Setting it again replaces the previous value rather than adding a duplicate.
success = mime.SetHeaderField("Subject","Weekly Report (revised)")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

subject = mime.GetHeaderField("Subject")
If (mime.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Subject: " & subject) & "</pre>"

%>
</body>
</html>