Returns ``True`` if the given string is a well-formed IP address. Supports IPv4 and IPv6.

Wake ``n`` waiters.

Resolves an address. The ``host`` argument is a string which may be a hostname or a literal IP address. Returns a `.Future`

Concatenate url and arguments regardless of whether url has existing query parameters. ``args`` may be either a dictionary or a list of key-v

Attempt to lock. Returns an awaitable. Returns an awaitable, which raises `tornado.util.TimeoutError` after a timeout.

Calls the given callback on the next I/O loop iteration. It is safe to call this method from any thread at any time, except from a si

Connects the socket to a remote address without blocking. May only be called if the socket passed to the constructor was not previous

Returns an iterable of all (name, value) pairs. If a header has multiple values, multiple pairs will be returned with the same name.

Parses all options given on the command line (defaults to `sys.argv`). Options look like ``--option=value`` and are parsed according

Parse a ``Cookie`` HTTP header into a dict of name/value pairs. This function attempts to mimic browser cookie parsing behavior; it specifica

Starts the I/O loop. The loop will run until one of the callbacks calls `stop()`, which will make the loop stop after the current eve

Executes a request, returning an `HTTPResponse`. The request may be either a string URL or an `HTTPRequest` object. If it is a string

Returns all values for the given header as a list.

Parses a ``multipart/form-data`` body. The ``boundary`` and ``data`` parameters are both byte strings. The dictionaries given in the argument

Record the resolution of a Future returned by Condition.wait.

Client-side websocket support. Takes a url and returns a Future whose result is a `WebSocketClientConnection`. ``compression_options`` i

Write an HTTP header block. :arg start_line: a `.RequestStartLine` or `.ResponseStartLine`. :arg headers: a `.HTTPHeaders` instance.

Advances the begin iterator to ``it``.