check_links_config.toml

retry_count = 5
text_file_extensions = [
    ".c",
    ".cpp",
    ".go",
    ".h",
    ".java",
    ".mod",
    ".md",
    ".py",
    ".rs",
    ".sh",
    ".txt",
]
[[ignores]]
url = "https://csrc.nist.gov/pubs/fips/186-4/final"
codes = [200, 404]
reason = """
This URL seems to sometimes return 404 to requests from GitHub Actions' runners,
and the issue cannot be handled with retries."""
considered_alternatives = [
    "https://www.omgwiki.org/dido/doku.php?id=dido:public:ra:xapend:xapend.b_stds:tech:nist:dss", # as flaky as the original
]

[[ignores]]
url = "https://mathoverflow.net/questions/207922/quickest-and-or-most-elementary-proof-of-principal-iff-splits-completely"
codes = [200, 403]
reason = """
This URL seems to sometimes return 403 to requests from GitHub Actions' runners,
and the issue cannot be handled with retries."""
considered_alternatives = [
    "https://core.ac.uk/download/pdf/82407901.pdf" # TODO: check the existence of (principal => splitting)
]