def extra_headers(sbox):
    'loading of dumpstream with extra headers'
    sbox.build(empty=True)
    dumpfile = clean_dumpfile()
    dumpfile[3:3] = [b'X-Comment-Header: Ignored header normally not in dump stream\n']
    load_and_verify_dumpstream(sbox, [], [], dumpfile_revisions, False, dumpfile, '--ignore-uuid')
loading of dumpstream with extra headers
def extra_headers(sbox):
    
    sbox.build(empty=True)
    dumpfile = clean_dumpfile()
    dumpfile[3:3] = [b'X-Comment-Header: Ignored header normally not in dump stream\n']
    load_and_verify_dumpstream(sbox, [], [], dumpfile_revisions, False, dumpfile, '--ignore-uuid')