How to use the urllib3.HTTPConnectionPool function in urllib3

def test_total_timeout(self):
        block_event = Event()
        ready_event = self.start_basic_handler(block_send=block_event, num=2)

        # This will get the socket to raise an EAGAIN on the read
        timeout = Timeout(connect=3, read=SHORT_TIMEOUT)
        pool = HTTPConnectionPool(self.host, self.port, timeout=timeout, retries=False)
        self.assertRaises(ReadTimeoutError, pool.request, 'GET', '/')

        block_event.set()
        ready_event.wait()
        block_event.clear()

        # The connect should succeed and this should hit the read timeout
        timeout = Timeout(connect=3, read=5, total=SHORT_TIMEOUT)
        pool = HTTPConnectionPool(self.host, self.port, timeout=timeout, retries=False)
        self.assertRaises(ReadTimeoutError, pool.request, 'GET', '/')

def _test_body(self, data):
        self.start_chunked_handler()
        with HTTPConnectionPool(self.host, self.port, retries=False) as pool:
            pool.urlopen("GET", "/", data, chunked=True)
            header, body = self.buffer.split(b"\r\n\r\n", 1)

            assert b"Transfer-Encoding: chunked" in header.split(b"\r\n")
            if data:
                bdata = data if isinstance(data, bytes) else data.encode("utf-8")
                assert b"\r\n" + bdata + b"\r\n" in body
                assert body.endswith(b"\r\n0\r\n\r\n")

                len_str = body.split(b"\r\n", 1)[0]
                stated_len = int(len_str, 16)
                assert stated_len == len(bdata)
            else:
                assert body == b"0\r\n\r\n"

def test_dns_error(self):
        pool = HTTPConnectionPool('thishostdoesnotexist.invalid', self.port, timeout=0.001)
        self.assertRaises(MaxRetryError, pool.request, 'GET', '/test', retries=2)

def test_retries_put_filehandle(self):
        """HTTP PUT retry with a file-like object should not timeout"""
        with HTTPConnectionPool(self.host, self.port, timeout=0.1) as pool:
            retry = Retry(total=3, status_forcelist=[418])
            # httplib reads in 8k chunks; use a larger content length
            content_length = 65535
            data = b"A" * content_length
            uploaded_file = io.BytesIO(data)
            headers = {
                "test-name": "test_retries_put_filehandle",
                "Content-Length": str(content_length),
            }
            resp = pool.urlopen(
                "PUT",
                "/successful_retry",
                headers=headers,
                retries=retry,
                body=uploaded_file,
                assert_same_host=False,

def test_for_double_release(self):
        MAXSIZE=5

        # Check default state
        pool = HTTPConnectionPool(self.host, self.port, maxsize=MAXSIZE)
        self.assertEqual(pool.num_connections, 0)
        self.assertEqual(pool.pool.qsize(), MAXSIZE)

        # Make an empty slot for testing
        pool.pool.get()
        self.assertEqual(pool.pool.qsize(), MAXSIZE-1)

        # Check state after simple request
        pool.urlopen('GET', '/')
        self.assertEqual(pool.pool.qsize(), MAXSIZE-1)

        # Check state without release
        pool.urlopen('GET', '/', preload_content=False)
        self.assertEqual(pool.pool.qsize(), MAXSIZE-2)

        pool.urlopen('GET', '/')

def test_partial_response(self):
        pool = HTTPConnectionPool(self.host, self.port, maxsize=1)

        req_data = {'lol': 'cat'}
        resp_data = urlencode(req_data).encode('utf-8')

        r = pool.request('GET', '/echo', fields=req_data, preload_content=False)

        self.assertEqual(r.read(5), resp_data[:5])
        self.assertEqual(r.read(), resp_data[5:])

def test_doesnt_use_https_if_not_specified(self):
        con = Urllib3HttpConnection()
        self.assertIsInstance(con.pool, urllib3.HTTPConnectionPool)

def _test_broken_header_parsing(self, headers):
        handler = create_response_handler((
           b'HTTP/1.1 200 OK\r\n'
           b'Content-Length: 0\r\n'
           b'Content-type: text/plain\r\n'
           ) + b'\r\n'.join(headers) + b'\r\n'
        )

        self._start_server(handler)
        pool = HTTPConnectionPool(self.host, self.port, retries=False)

        with LogRecorder() as logs:
            pool.request('GET', '/')

        for record in logs:
            if 'Failed to parse headers' in record.msg and \
                    pool._absolute_url('/') == record.args[0]:
                return
        self.fail('Missing log about unparsed headers')

def __init__(self, host, port, useragent=USERAGENT,
                 connection_class=urllib3.HTTPConnectionPool, **kwargs):
        self.useragent = useragent
        self._connection = connection_class(host, port, **kwargs)

def __init__(self, config):
        url = config.get("geonames", "url")
        username = config.get("geonames", "user")
        fuzzy = config.get("geonames", "fuzzy")

        self.post_data = {
            'q': '',
            'username': username,
            'type': 'json',
            'fuzzy': fuzzy,
            'orderBy': 'relevance'
        }
        self.pool = urllib3.HTTPConnectionPool(host=url, maxsize=25, headers={'accept': 'application/json'})