def patched_start_response(status, headers, exc_info=None):
            # if self._should_handle(headers)
            wsgi_headers = Headers(headers)

            # If we're debugging, or the response already has an expires
            # header, just skip this.
            log.debug('Skipping expired headers' if self.debug else 'Calculating expires headers')
            if not self.debug and 'Expires' not in wsgi_headers:
                mime = wsgi_headers.get('Content-Type', '*').split(';')[0]
                log.debug('See mime type ' + mime)

                # If the mime type is explicitly called out, use the expire
                # delay specified.
                if mime in self.expire_seconds:
                    log.debug('Matched mimetype exactly.')
                    expire_time = self.make_expire_time_for(mime)

                # If there's a catch-all wildcard delay, use that.
                elif '*' in self.expire_seconds:
                    log.debug('Matched mimetype with universal.')
                    expire_time = self.make_expire_time_for('*')

                # Otherwise, don't set the header.
                else:
                    log.debug('No mimetype match.')
                    expire_time = None

                if expire_time is not None:
                    log.debug('Adding expires header value: ' + expire_time)
                    headers.append(('Expires', expire_time))

            log.debug('-'*60)
            return start_response(status, headers, exc_info)

    def testMappingInterface(self):
        test = [("x", "y")]
        self.assertEqual(len(Headers([])), 0)
        self.assertEqual(len(Headers(test[:])), 1)
        self.assertEqual(Headers(test[:]).keys(), ["x"])
        self.assertEqual(Headers(test[:]).values(), ["y"])
        self.assertEqual(Headers(test[:]).items(), test)
        self.assertIsNot(Headers(test).items(), test)  # must be copy!

        h = Headers([])
        del h["foo"]  # should not raise an error

        h["Foo"] = "bar"
        for m in h.has_key, h.__contains__, h.get, h.get_all, h.__getitem__:
            self.assertTrue(m("foo"))
            self.assertTrue(m("Foo"))
            self.assertTrue(m("FOO"))
            self.assertFalse(m("bar"))

        self.assertEqual(h["foo"], "bar")
        h["foo"] = "baz"
        self.assertEqual(h["FOO"], "baz")
        self.assertEqual(h.get_all("foo"), ["baz"])

        self.assertEqual(h.get("foo", "whee"), "baz")
        self.assertEqual(h.get("zoo", "whee"), "whee")
        self.assertEqual(h.setdefault("foo", "whee"), "baz")
        self.assertEqual(h.setdefault("zoo", "whee"), "whee")
        self.assertEqual(h["foo"], "baz")
        self.assertEqual(h["zoo"], "whee")

    def handle_application_error(self, environ, start_response):
        status = "500 Internal Server Error"
        headers = Headers([])

        # Package the exception info as into a special header and
        # send it to the client
        type, exc, tb = sys.exc_info()

        tbfile = StringIO()

        traceback.print_exc(file=tbfile)
        headers['Content-Type'] = 'text/plain; charset=utf-8'

        LOG.debug("Packing traceback context into debug header: %s",
                  self.debug_header)
        debug_header = self.pack_header(Traceback(tb))
        LOG.debug("Debug header (%d bytes): %s",
                  len(debug_header), debug_header)
        headers[self.debug_header] = debug_header

        app_uri = application_uri(environ)
        headers["Location"] = app_uri[:-1] + self.debug_uri

        start_response(status, headers.items())
        return [tbfile.getvalue().encode('utf-8')]

    def testMappingInterface(self):
        test = [('x','y')]
        self.assertEqual(len(Headers([])),0)
        self.assertEqual(len(Headers(test[:])),1)
        self.assertEqual(Headers(test[:]).keys(), ['x'])
        self.assertEqual(Headers(test[:]).values(), ['y'])
        self.assertEqual(Headers(test[:]).items(), test)
        self.assertFalse(Headers(test).items() is test)  # must be copy!

        h=Headers([])
        del h['foo']   # should not raise an error

        h['Foo'] = 'bar'
        for m in h.__contains__, h.get, h.get_all, h.__getitem__:
            self.assertTrue(m('foo'))
            self.assertTrue(m('Foo'))
            self.assertTrue(m('FOO'))
            self.assertFalse(m('bar'))

        self.assertEqual(h['foo'],'bar')
        h['foo'] = 'baz'
        self.assertEqual(h['FOO'],'baz')
        self.assertEqual(h.get_all('foo'),['baz'])

        self.assertEqual(h.get("foo","whee"), "baz")
        self.assertEqual(h.get("zoo","whee"), "whee")
        self.assertEqual(h.setdefault("foo","whee"), "baz")
        self.assertEqual(h.setdefault("zoo","whee"), "whee")
        self.assertEqual(h["foo"],"baz")
        self.assertEqual(h["zoo"],"whee")

def parse_http_headers(environ):
    h = Headers([])
    for k, v in environ.items():
        if k.startswith('HTTP_'):
            name = k[5:]
            h.add_header(name, v)
    return h

def thread_app(env, resp):
    path = env['PATH_INFO']
    # utils.log('thread_app', path)
    m = thread_re.match(path)
    board, datkey = m.group(1), m.group(2)

    key = keylib.get_filekey(datkey)
    data = cache.Cache(key)
    data.load()

    if check_get_cache(env):
        if not data.exists() or len(data) == 0:
            # when first access, load data from network
            data.search()

        elif _count_is_update(key):
            # update thread
            # limit `data.search` calling. it's slow!
            threading.Thread(target=data.search, daemon=True).start()

    if not data.exists():
        resp('404 Not Found', [('Content-Type', 'text/plain; charset=Shift_JIS')])
        return [b'404 Not Found']

    thread = dat.make_dat(data, env, board)

    headers = Headers([('Content-Type', 'text/plain; charset=Shift_JIS')])
    last_m = eutils.formatdate(data.stamp)
    headers['Last-Modified'] = last_m
    resp("200 OK", headers.items())

    return (c.encode('cp932', 'replace') for c in thread)

def board_app(env, resp):
    path = env['PATH_INFO']
    m = board_re.match(path)
    board = m.group(1)
    message = gateway.search_message(env.get('HTTP_ACCEPT_LANGUAGE', 'ja'))

    headers = Headers([('Content-Type', 'text/html; charset=Shift_JIS')])
    resp("200 OK", headers.items())

    board = utils.sanitize(utils.get_board(path))

    if board:
        fmt = '{logo} - {board} - {desc}'
    else:
        fmt = '{logo} - {desc}'

    text = fmt.format(logo=message['logo'], desc=message['description'], board=board)

    html = '''
        <!DOCTYPE html>
        <html><head>
        <meta http-equiv="content-type" content="text/html; charset=Shift_JIS">
        <title>{text}</title>
        <meta name="description" content="{text}">
        </head><body>
        <h1>{text}</h1>
        </body></html>
    '''.format(text=text)
    return [html.encode('cp932', 'replace')]

        def patched_start_response(status, headers, exc_info=None):
            # if self._should_handle(headers)
            wsgi_headers = Headers(headers)

            # If we're debugging, or the response already has an expires
            # header, just skip this.
            if not self.debug and "Expires" not in wsgi_headers:
                mime = wsgi_headers.get("Content-Type", "*").split(";")[0]

                # If the mime type is explicitly called out, use the expire
                # delay specified.
                if mime in self.expire_seconds:
                    expire_time = self.make_expire_time_for(mime)

                # If there's a catch-all wildcard delay, use that.
                elif "*" in self.expire_seconds:
                    expire_time = self.make_expire_time_for("*")

                # Otherwise, don't set the header.
                else:
                    expire_time = None

                if expire_time is not None:
                    log.debug("Adding expires header value: " + expire_time)
                    headers.append(("Expires", expire_time))

            return start_response(status, headers, exc_info)

    def getTileResponse(self, coord, extension, ignore_cached=False):
        """ Get status code, headers, and a tile binary for a given request layer tile.
        
            Arguments:
            - coord: one ModestMaps.Core.Coordinate corresponding to a single tile.
            - extension: filename extension to choose response type, e.g. "png" or "jpg".
            - ignore_cached: always re-render the tile, whether it's in the cache or not.
        
            This is the main entry point, after site configuration has been loaded
            and individual tiles need to be rendered.
        """
        start_time = time()
        
        mimetype, format = self.getTypeByExtension(extension)

        # default response values
        status_code = 200
        headers = Headers([('Content-Type', mimetype)])
        body = None

        cache = self.config.cache

        if not ignore_cached:
            # Start by checking for a tile in the cache.
            try:
                body = cache.read(self, coord, format)
            except TheTileLeftANote, e:
                headers = e.headers
                status_code = e.status_code
                body = e.content

                if e.emit_content_type:
                    headers.setdefault('Content-Type', mimetype)

            tile_from = 'cache'

 def get_alternatives(base_headers, files):
     # Sort by size so that the smallest compressed alternative matches first
     alternatives = []
     files_by_size = sorted(files.items(), key=lambda i: i[1].stat.st_size)
     for encoding, file_entry in files_by_size:
         headers = Headers(base_headers.items())
         headers['Content-Length'] = str(file_entry.stat.st_size)
         if encoding:
             headers['Content-Encoding'] = encoding
             encoding_re = re.compile(r'\b%s\b' % encoding)
         else:
             encoding_re = re.compile('')
         alternatives.append((encoding_re, file_entry.path, headers.items()))
     return alternatives

    def signal_land_or_sea(self, body, layer, coord, format):
        if body:
            md5sum = self.md5sum(body)
            second_md5sum = self.md5sum(Disk.read(self, self.second, coord, format))
            
            headers = Headers([('Access-Control-Expose-Headers', 'X-Land-Or-Sea')])
            headers.setdefault('X-Land-Or-Sea', '0')
            
            if second_md5sum and md5sum == second_md5sum:
                if md5sum == self.land_md5:
                    headers['X-Land-Or-Sea'] = '1'
                elif md5sum == self.sea_md5:
                    headers['X-Land-Or-Sea'] = '2'

            raise TheTileLeftANote(content=body, headers=headers)

    def __call__(self, environ, start_response):
        key_morsel = Cookie(environ.get("HTTP_COOKIE", "")).get(self.toggle_key)
        # useful vars
        query = query_str2dict(environ.get("QUERY_STRING"))
        enable_by_cookie = key_morsel.value == self.enable_value if key_morsel else False
        enable_by_query = query.get(self.toggle_key) == self.enable_value
        # pop toggle_key from query dic to avoid case: '?_profile=on&_profile='
        disable = query.pop(self.toggle_key, None) == ""  # only can be disabled by query
        enable = not disable and (enable_by_query or enable_by_cookie)

        run_app, resp_body, saved_ss_args = self._intercept_call()

        # processing cookies and queries
        so = query.pop(self.SIMPLE_OUTPUT_TOGGLE_KEY, None)
        if so is not None:
            self.simple_output = so == "True"
        cookie_to_set = None
        if enable_by_query and not enable_by_cookie:
            cookie_to_set = "%s=%s; Path=/; HttpOnly" % (self.toggle_key, self.enable_value)
        elif disable:
            cookie_to_set = "%s=; Path=/; Max-Age=1; HttpOnly" % self.toggle_key

        if enable:
            start = time.time()
            profile = Profile()
            profile.runcall(run_app, environ)  # here we call the WSGI app
            elapsed = time.time() - start
        else:
            profile = elapsed = None  # for annoying IDE
            run_app(environ)

        status, headers = saved_ss_args[:2]
        headers_dic = Headers(headers)
        if cookie_to_set:
            headers_dic.add_header("Set-Cookie", cookie_to_set)

        # insert result into response
        content_type = headers_dic.get("Content-Type", "")
        if enable and status.startswith("200") and content_type.startswith("text/html"):
            environ["QUERY_STRING"] = dict2query_str(query)

            matched = _find_charset.match(content_type)
            encoding = matched.group(1) if matched else "ascii"
            rendered = self.render_result(profile, elapsed, environ).encode(encoding, "replace")
            resp_body = [insert_into_body(rendered, b"".join(resp_body))]
            headers_dic["Content-Length"] = str(len(resp_body[0]))
        start_response(status, headers, saved_ss_args[2] if len(saved_ss_args) == 3 else None)
        return resp_body

 def get_static_file(self, path, url, stat_cache=None):
     # Optimization: bail early if file does not exist
     if stat_cache is None and not os.path.exists(path):
         raise MissingFileError(path)
     headers = Headers([])
     self.add_mime_headers(headers, path, url)
     self.add_cache_headers(headers, path, url)
     if self.allow_all_origins:
         headers['Access-Control-Allow-Origin'] = '*'
     if self.add_headers_function:
         self.add_headers_function(headers, path, url)
     return StaticFile(
             path, headers.items(),
             stat_cache=stat_cache,
             encodings={
               'gzip': path + '.gz', 'br': path + '.br'})

def _parse_headers(environ):
    """
    Parse the environmental variables, looking for HTTP request headers.
    :param environ: environmental variables
    :type environ: dict
    :return: request headers
    :rtype: dict
    """
    headers = Headers([])
    for key, value in environ.items():
        match = _HTTP_HEADER_REGEX.match(key)
        if match is None:
            continue
        name = _normalize_header_name(match.group(0))
        headers.add_header(name, value)
    return headers

    def __init__(self, path, is_immutable, guess_type=mimetypes.guess_type, **config):
        self.path = path
        stat = os.stat(path)
        self.mtime_tuple = gmtime(stat.st_mtime)
        mimetype, encoding = guess_type(path)
        mimetype = mimetype or 'application/octet-stream'
        charset = self.get_charset(mimetype)
        params = {'charset': charset} if charset else {}
        self.headers = Headers([
            ('Last-Modified', formatdate(stat.st_mtime, usegmt=True)),
            ('Content-Length', str(stat.st_size)),
        ])
        self.headers.add_header('Content-Type', str(mimetype), **params)
        if encoding:
            self.headers['Content-Encoding'] = encoding

        max_age = self.FOREVER if is_immutable else config['max_age']
        if max_age is not None:
            self.headers['Cache-Control'] = 'public, max-age=%s' % max_age

        if config['allow_all_origins']:
            self.headers['Access-Control-Allow-Origin'] = '*'

        gzip_path = path + self.GZIP_SUFFIX
        if os.path.isfile(gzip_path):
            self.gzip_path = gzip_path
            self.headers['Vary'] = 'Accept-Encoding'
            # Copy the headers and add the appropriate encoding and length
            self.gzip_headers = Headers(self.headers.items())
            self.gzip_headers['Content-Encoding'] = 'gzip'
            self.gzip_headers['Content-Length'] = str(os.stat(gzip_path).st_size)
        else:
            self.gzip_path = self.gzip_headers = None

    def newapp(environ, start_response):
        body = app(environ, capture)
        status = resp['status']
        headers = Headers(resp['headers'])

        already = 'Content-Encoding' in headers
        accepted = 'gzip' in environ.get('HTTP_ACCEPT_ENCODING', '')
        if not accepted or already:
            # no compress
            start_response(status, list(headers.items()))
            return body

        content = gzip.compress(b''.join(body))
        if hasattr(body, 'close'):
            body.close()
        headers['Content-Encoding'] = 'gzip'
        start_response(status, list(headers.items()))
        return [content]

    def __init__(self, body=b'', status=None, headers=None):
        self.headers = Headers()
        self._body = body
        self._status_code = status or self.default_status
        self._cookies = SimpleCookie()

        if headers:
            for name, value in headers.items():
                self.headers.add_header(name, value)

def board_app(env, resp):
    path = env['PATH_INFO']
    m = board_re.match(path)
    board = m.group(1)
    message = gateway.search_message(env.get('HTTP_ACCEPT_LANGUAGE', 'ja'))

    headers = Headers([('Content-Type', 'text/html; charset=Shift_JIS')])
    resp("200 OK", headers.items())

    html = [
        '<!DOCTYPE html>',
        '<html><head>',
        '<meta http-equiv="content-type" content="text/html; charset=Shift_JIS">',
        '<title>%s - %s</title>' % (message['logo'], message['description']),
        '<meta name="description" content="%s - %s">' % (message['logo'], message['description']),
        '</head><body>',
        '<h1>%s - %s</h1>' % (message['logo'], message['description']),
        '</body></html>',
    ]
    return ((c + '\n').encode('sjis', 'ignore') for c in html)

 def finish_header(self):
     self.file = BytesIO()
     self.headers = Headers(self.headerlist)
     cdis = self.headers.get('Content-Disposition', '')
     ctype = self.headers.get('Content-Type', '')
     if not cdis:
         raise MultipartError('Content-Disposition header is missing.')
     self.disposition, self.options = parse_options_header(cdis)
     self.name = self.options.get('name')
     self.filename = self.options.get('filename')
     self.content_type, options = parse_options_header(ctype)
     self.charset = options.get('charset') or self.charset
     self.content_length = int(self.headers.get('Content-Length', '-1'))

 def finish_header(self):
     self.file = BytesIO()
     self.headers = Headers(self.headerlist)
     cdis = self.headers.get("Content-Disposition", "")
     ctype = self.headers.get("Content-Type", "")
     clen = self.headers.get("Content-Length", "-1")
     if not cdis:
         raise MultipartError("Content-Disposition header is missing.")
     self.disposition, self.options = parse_options_header(cdis)
     self.name = self.options.get("name")
     self.filename = self.options.get("filename")
     self.content_type, options = parse_options_header(ctype)
     self.charset = options.get("charset") or self.charset
     self.content_length = int(self.headers.get("Content-Length", "-1"))