validate.py 文件源码

def check_headers(headers):
    assert_(type(headers) is ListType,
        "Headers (%r) must be of type list: %r"
        % (headers, type(headers)))
    header_names = {}
    for item in headers:
        assert_(type(item) is TupleType,
            "Individual headers (%r) must be of type tuple: %r"
            % (item, type(item)))
        assert_(len(item) == 2)
        name, value = item
        assert_(name.lower() != 'status',
            "The Status header cannot be used; it conflicts with CGI "
            "script, and HTTP status is not given through headers "
            "(value: %r)." % value)
        header_names[name.lower()] = None
        assert_('\n' not in name and ':' not in name,
            "Header names may not contain ':' or '\\n': %r" % name)
        assert_(header_re.search(name), "Bad header name: %r" % name)
        assert_(not name.endswith('-') and not name.endswith('_'),
            "Names may not end in '-' or '_': %r" % name)
        if bad_header_value_re.search(value):
            assert_(0, "Bad header value: %r (bad char: %r)"
            % (value, bad_header_value_re.search(value).group(0)))