Zig

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.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const mime = try chilkat.Mime.init();
    defer mime.deinit();
    mime.loadMimeFile("qa_data/message.eml") catch {
        std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
        return;
    };

    // 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.
    const b_all_occurrences = true;
    mime.removeHeaderField("X-Spam-Status", b_all_occurrences);

    std.debug.print("Removed the header field(s).\n", .{});
}