Lua

Remove a MIME Header Field

Demonstrates the Chilkat Mime.RemoveHeaderField method, which removes header fields whose name matches case-insensitively. The first argument is the field name and the second (bAllOccurrences) selects whether to remove all matches or only the first. It is a void method.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Stripping headers is common when reprocessing a message — removing spam-scoring X- headers, clearing an old Content-Length before re-serializing, or deleting routing headers before forwarding. The all-occurrences flag matters for headers that can repeat: pass true to purge every instance, or false to drop just the first.

Chilkat Lua Downloads

Download Chilkat for Lua

Lua

local chilkat = require("chilkat")

local mime = chilkat.Mime.new()
local success = mime:load_mime_file("qa_data/message.eml")
if not success then
    print(mime.last_error_text)
    return
end

-- Remove header fields whose name matches (case-insensitively).  The 1st argument is the field
-- name and the 2nd (bAllOccurrences) selects whether to remove all matches or only the first.
-- RemoveHeaderField is a void method.

-- Remove every X-Spam-Status header.
local bAllOccurrences = true
mime:remove_header_field("X-Spam-Status", bAllOccurrences)

print("Removed the header field(s).")