connect/clickhouse_connect/driver/httpclient.py

import io
import json
import logging
import re
import uuid
from base64 import b64encode
from collections.abc import Callable, Generator, Sequence
from importlib import import_module
from importlib.metadata import version as dist_version
from typing import Any, BinaryIO
from urllib.parse import urlencode

from urllib3 import Timeout
from urllib3.exceptions import HTTPError
from urllib3.poolmanager import PoolManager
from urllib3.response import HTTPResponse

from clickhouse_connect import common
from clickhouse_connect.datatypes import registry
from clickhouse_connect.datatypes.base import ClickHouseType
from clickhouse_connect.driver.binding import bind_query, quote_identifier
from clickhouse_connect.driver.client import Client
from clickhouse_connect.driver.common import coerce_bool, coerce_int, dict_add, dict_copy
from clickhouse_connect.driver.compression import available_compression
from clickhouse_connect.driver.ctypes import RespBuffCls
from clickhouse_connect.driver.exceptions import DatabaseError, OperationalError, ProgrammingError
from clickhouse_connect.driver.external import ExternalData
from clickhouse_connect.driver.httputil import (
    ResponseSource,
    all_managers,
    check_conn_expiration,
    check_env_proxy,
    default_pool_manager,
    get_pool_manager,
    get_proxy_manager,
    get_response_data,
)
from clickhouse_connect.driver.insert import InsertContext
from clickhouse_connect.driver.query import QueryContext, QueryResult, TzSource
from clickhouse_connect.driver.summary import QuerySummary
from clickhouse_connect.driver.transform import NativeTransform

logger = logging.getLogger(__name__)
columns_only_re = re.compile(r"LIMIT 0\s*$", re.IGNORECASE)
ex_header = "X-ClickHouse-Exception-Code"
ex_tag_header = "X-ClickHouse-Exception-Tag"


class HttpClient(Client):
    params = {}
    valid_transport_settings = {
        "database",
        "buffer_size",
        "session_id",
        "compress",
        "decompress",
        "session_timeout",
        "session_check",
        "query_id",
        "quota_key",
        "wait_end_of_query",
        "client_protocol_version",
        "role",
    }
    optional_transport_settings = {"send_progress_in_http_headers", "http_headers_progress_interval_ms", "enable_http_compression"}
    _owns_pool_manager = False

    # R0917: too-many-positional-arguments

    def __init__(
        self,
        interface: str,
        host: str,
        port: int,
        username: str,
        password: str,
        database: str,
        access_token: str | None = None,
        compress: bool | str = True,
        query_limit: int = 0,
        query_retries: int = 2,
        connect_timeout: int = 10,
        send_receive_timeout: int = 300,
        client_name: str | None = None,
        verify: bool | str = True,
        ca_cert: str | None = None,
        client_cert: str | None = None,
        client_cert_key: str | None = None,
        session_id: str | None = None,
        settings: dict[str, Any] | None = None,
        pool_mgr: PoolManager | None = None,
        http_proxy: str | None = None,
        https_proxy: str | None = None,
        server_host_name: str | None = None,
        tz_source: TzSource | None = None,
        tz_mode: str | None = None,
        show_clickhouse_errors: bool | None = None,
        autogenerate_session_id: bool | None = None,
        autogenerate_query_id: bool | None = None,
        tls_mode: str | None = None,
        proxy_path: str = "",
        form_encode_query_params: bool = False,
        rename_response_column: str | None = None,
    ):
        """
        Create an HTTP ClickHouse Connect client
        See clickhouse_connect.get_client for parameters
        """
        proxy_path = proxy_path.lstrip("/")
        if proxy_path:
            proxy_path = "/" + proxy_path
        self.url = f"{interface}://{host}:{port}{proxy_path}"
        self.headers = {}
        self.form_encode_query_params = form_encode_query_params
        self.params = dict_copy(HttpClient.params)
        ch_settings = dict_copy(settings, self.params)
        self.http = pool_mgr
        if interface == "https":
            if isinstance(verify, str) and verify.lower() == "proxy":
                verify = True
                tls_mode = tls_mode or "proxy"
            if not https_proxy:
                https_proxy = check_env_proxy("https", host, port)
            verify = coerce_bool(verify)
            if client_cert and (tls_mode is None or tls_mode == "mutual"):
                if not username:
                    raise ProgrammingError("username parameter is required for Mutual TLS authentication")
                self.headers["X-ClickHouse-User"] = username
                self.headers["X-ClickHouse-SSL-Certificate-Auth"] = "on"

            if not self.http and (server_host_name or ca_cert or client_cert or not verify or https_proxy):
                options = {"verify": verify}
                dict_add(options, "ca_cert", ca_cert)
                dict_add(options, "client_cert", client_cert)
                dict_add(options, "client_cert_key", client_cert_key)
                if server_host_name:
                    if options["verify"]:
                        options["assert_hostname"] = server_host_name
                    options["server_hostname"] = server_host_name
                self.http = get_pool_manager(https_proxy=https_proxy, **options)
                self._owns_pool_manager = True
        if not self.http:
            if not http_proxy:
                http_proxy = check_env_proxy("http", host, port)
            if http_proxy:
                self.http = get_proxy_manager(host, http_proxy)
            else:
                self.http = default_pool_manager()

        if access_token:
            self.headers["Authorization"] = f"Bearer {access_token}"
        elif (not client_cert or tls_mode in ("strict", "proxy")) and username:
            self.headers["Authorization"] = "Basic " + b64encode(f"{username}:{password}".encode()).decode()

        self._reported_libs = set()
        self.headers["User-Agent"] = common.build_client_name(client_name)
        self._read_format = self._write_format = "Native"
        self._transform = NativeTransform()

        # There are use cases when the client needs to disable timeouts.
        if connect_timeout is not None:
            connect_timeout = coerce_int(connect_timeout)
        if send_receive_timeout is not None:
            send_receive_timeout = coerce_int(send_receive_timeout)
        self.timeout = Timeout(connect=connect_timeout, read=send_receive_timeout)
        self.http_retries = 1
        self._send_progress = None
        self._send_comp_setting = False
        self._progress_interval = None
        self._active_session = None
        self._rename_response_column = rename_response_column

        # allow to override the global autogenerate_session_id setting via the constructor params
        _autogenerate_session_id = (
            common.get_setting("autogenerate_session_id") if autogenerate_session_id is None else autogenerate_session_id
        )

        if session_id:
            ch_settings["session_id"] = session_id
        elif "session_id" not in ch_settings and _autogenerate_session_id:
            ch_settings["session_id"] = str(uuid.uuid4())

        # allow to override the global autogenerate_query_id setting via the constructor params
        self._autogenerate_query_id = (
            common.get_setting("autogenerate_query_id") if autogenerate_query_id is None else autogenerate_query_id
        )

        if coerce_bool(compress):
            compression = ",".join(available_compression)
            self.write_compression = available_compression[0]
        elif compress and compress not in ("False", "false", "0"):
            if compress not in available_compression:
                raise ProgrammingError(f"Unsupported compression method {compress}")
            compression = compress
            self.write_compression = compress
        else:
            compression = None

        super().__init__(
            database=database,
            uri=self.url,
            query_limit=query_limit,
            query_retries=query_retries,
            server_host_name=server_host_name,
            tz_source=tz_source,
            tz_mode=tz_mode,
            show_clickhouse_errors=show_clickhouse_errors,
            autoconnect=True,
        )
        self.params = dict_copy(self.params, self._validate_settings(ch_settings))
        cancel_setting = self._setting_status("cancel_http_readonly_queries_on_client_close")
        if (
            cancel_setting.is_writable
            and not cancel_setting.is_set
            and "cancel_http_readonly_queries_on_client_close" not in (settings or {})
        ):
            self.params["cancel_http_readonly_queries_on_client_close"] = "1"
        comp_setting = self._setting_status("enable_http_compression")
        self._send_comp_setting = not comp_setting.is_set and comp_setting.is_writable
        if comp_setting.is_set or comp_setting.is_writable:
            self.compression = compression
        send_setting = self._setting_status("send_progress_in_http_headers")
        self._send_progress = not send_setting.is_set and send_setting.is_writable
        if (send_setting.is_set or send_setting.is_writable) and self._setting_status("http_headers_progress_interval_ms").is_writable:
            self._progress_interval = str(min(120000, max(10000, (send_receive_timeout - 5) * 1000)))

    def set_client_setting(self, key: str, value: Any) -> None:
        str_value = self._validate_setting(key, value, common.get_setting("invalid_setting_action"))
        if str_value is not None:
            self.params[key] = str_value

    def get_client_setting(self, key: str) -> str | None:
        return self.params.get(key)

    def set_access_token(self, access_token: str) -> None:
        auth_header = self.headers.get("Authorization")
        if auth_header and not auth_header.startswith("Bearer"):
            raise ProgrammingError("Cannot set access token when a different auth type is used")
        self.headers["Authorization"] = f"Bearer {access_token}"

    def _prep_query(self, context: QueryContext):
        final_query = super()._prep_query(context)
        if context.is_insert:
            return final_query
        fmt = f"\n FORMAT {self._read_format}"
        if isinstance(final_query, bytes):
            return final_query + fmt.encode()
        return final_query + fmt

    def _query_with_context(self, context: QueryContext) -> QueryResult:
        headers = {}
        params = {}
        if self.database:
            params["database"] = self.database
        if self.protocol_version:
            params["client_protocol_version"] = self.protocol_version
            context.block_info = True
        params.update(self._validate_settings(context.settings))
        context.rename_response_column = self._rename_response_column
        if not context.is_insert and columns_only_re.search(context.uncommented_query):
            # Mirror normal query behavior for form encoding and external data
            fmt_json_query = f"{context.final_query}\n FORMAT JSON"
            if self.form_encode_query_params:
                fields = {"query": fmt_json_query}
                fields.update(context.bind_params)
                if context.external_data:  # Deal with form encoding + external data
                    params.update(context.external_data.query_params)
                    fields.update(context.external_data.form_data)
                response = self._raw_request(b"", params, headers, retries=self.query_retries, fields=fields)
            elif context.external_data:  # Deal with external data without form encoding
                fields = context.external_data.form_data
                params.update(context.bind_params)
                params.update(context.external_data.query_params)
                params["query"] = fmt_json_query
                response = self._raw_request(b"", params, headers, retries=self.query_retries, fields=fields)
            else:  # Legacy behavior (plain body, bind params in URL)
                params.update(context.bind_params)
                response = self._raw_request(fmt_json_query, params, headers, retries=self.query_retries)
            json_result = json.loads(response.data)
            # ClickHouse will respond with a JSON object of meta, data, and some other objects
            # We just grab the column names and column types from the metadata sub object
            names: list[str] = []
            types: list[ClickHouseType] = []
            renamer = context.column_renamer
            for col in json_result["meta"]:
                name = col["name"]
                if renamer is not None:
                    try:
                        name = renamer(name)
                    except Exception as e:
                        logger.debug("Failed to rename col '%s'. Skipping rename. Error: %s", name, e)
                names.append(name)
                types.append(registry.get_from_name(col["type"]))
            return QueryResult([], None, tuple(names), tuple(types))

        if self.compression:
            headers["Accept-Encoding"] = self.compression
            if self._send_comp_setting:
                params["enable_http_compression"] = "1"
        final_query = self._prep_query(context)
        fields = {}
        # Setup additional query parameters and body
        if self.form_encode_query_params:
            body = b""
            fields["query"] = final_query
            fields.update(context.bind_params)
            if context.external_data:
                params.update(context.external_data.query_params)
                fields.update(context.external_data.form_data)
        elif context.external_data:
            params.update(context.bind_params)
            body = b""
            params["query"] = final_query
            params.update(context.external_data.query_params)
            fields = context.external_data.form_data
        else:
            params.update(context.bind_params)
            body = final_query
            fields = None
            headers["Content-Type"] = "text/plain; charset=utf-8"
        response = self._raw_request(
            body,
            params,
            dict_copy(headers, context.transport_settings),
            stream=True,
            retries=self.query_retries,
            fields=fields,
            server_wait=not context.streaming,
        )
        exception_tag = response.headers.get(ex_tag_header)
        byte_source = RespBuffCls(ResponseSource(response, exception_tag=exception_tag))
        context.set_response_tz(self._check_tz_change(response.headers.get("X-ClickHouse-Timezone")))
        query_result = self._transform.parse_response(byte_source, context)
        query_result.summary = self._summary(response)
        return query_result

    def data_insert(self, context: InsertContext) -> QuerySummary:
        """
        See BaseClient doc_string for this method
        """
        if context.empty:
            logger.debug("No data included in insert, skipping")
            return QuerySummary()

        def error_handler(resp: HTTPResponse):
            # If we actually had a local exception when building the insert, throw that instead
            if context.insert_exception:
                ex = context.insert_exception
                context.insert_exception = None
                raise ex
            self._error_handler(resp)

        headers = {"Content-Type": "application/octet-stream"}
        if context.compression is None:
            context.compression = self.write_compression
        if context.compression:
            headers["Content-Encoding"] = context.compression
        block_gen = self._transform.build_insert(context)

        def rebuild_block_gen():
            context.current_row = 0
            context.current_block = 0
            return self._transform.build_insert(context)

        params = {}
        if self.database:
            params["database"] = self.database
        params.update(self._validate_settings(context.settings))
        headers = dict_copy(headers, context.transport_settings)
        try:
            response = self._raw_request(
                block_gen,
                params,
                headers,
                error_handler=error_handler,
                server_wait=False,
                retry_body=rebuild_block_gen,
            )
            logger.debug("Context insert response code: %d, content: %s", response.status, response.data)
            return QuerySummary(self._summary(response))
        finally:
            context.data = None

    def raw_insert(
        self,
        table: str = None,
        column_names: Sequence[str] | None = None,
        insert_block: str | bytes | Generator[bytes, None, None] | BinaryIO = None,
        settings: dict | None = None,
        fmt: str | None = None,
        compression: str | None = None,
        transport_settings: dict[str, str] | None = None,
    ) -> QuerySummary:
        """
        See BaseClient doc_string for this method
        """
        params = {}
        headers = {"Content-Type": "application/octet-stream"}
        if compression:
            headers["Content-Encoding"] = compression
        if table:
            cols = f" ({', '.join([quote_identifier(x) for x in column_names])})" if column_names is not None else ""
            query = f"INSERT INTO {table}{cols} FORMAT {fmt if fmt else self._write_format}"
            if not compression and isinstance(insert_block, str):
                insert_block = query + "\n" + insert_block
            elif not compression and isinstance(insert_block, (bytes, bytearray, BinaryIO)):
                insert_block = (query + "\n").encode() + insert_block
            else:
                params["query"] = query
        if self.database:
            params["database"] = self.database
        params.update(self._validate_settings(settings or {}))
        headers = dict_copy(headers, transport_settings)
        response = self._raw_request(insert_block, params, headers, server_wait=False)
        logger.debug("Raw insert response code: %d, content: %s", response.status, response.data)
        return QuerySummary(self._summary(response))

    @staticmethod
    def _summary(response: HTTPResponse):
        summary = {}
        if "X-ClickHouse-Summary" in response.headers:
            try:
                summary = json.loads(response.headers["X-ClickHouse-Summary"])
            except json.JSONDecodeError:
                pass
        summary["query_id"] = response.headers.get("X-ClickHouse-Query-Id", "")
        return summary

    def command(
        self,
        cmd: str,
        parameters: Sequence | dict[str, Any] | None = None,
        data: str | bytes = None,
        settings: dict | None = None,
        use_database: bool = True,
        external_data: ExternalData | None = None,
        transport_settings: dict[str, str] | None = None,
    ) -> str | int | Sequence[str] | QuerySummary:
        """
        See BaseClient doc_string for this method
        """
        cmd, params = bind_query(cmd, parameters, self.server_tz)
        headers = {}
        payload = None
        fields = None
        if external_data:
            if data:
                raise ProgrammingError("Cannot combine command data with external data") from None
            fields = external_data.form_data
            params.update(external_data.query_params)
        elif isinstance(data, str):
            headers["Content-Type"] = "text/plain; charset=utf-8"
            payload = data.encode()
        elif isinstance(data, bytes):
            headers["Content-Type"] = "application/octet-stream"
            payload = data
        if payload is None and not cmd:
            raise ProgrammingError("Command sent without query or recognized data") from None
        if payload or fields:
            params["query"] = cmd
        else:
            payload = cmd
        if use_database and self.database:
            params["database"] = self.database
        params.update(self._validate_settings(settings or {}))
        headers = dict_copy(headers, transport_settings)
        method = "POST" if payload or fields else "GET"
        response = self._raw_request(payload, params, headers, method, fields=fields, server_wait=False)
        if response.data:
            try:
                result = response.data.decode()[:-1].split("\t")
                if len(result) == 1:
                    try:
                        return int(result[0])
                    except ValueError:
                        return result[0]
                return result
            except UnicodeDecodeError:
                return str(response.data)
        return QuerySummary(self._summary(response))

    def _error_handler(self, response: HTTPResponse, retried: bool = False) -> None:
        """
        Handles HTTP errors. Tries to be robust and provide maximum context.
        """
        try:
            body = ""
            try:
                raw_body = get_response_data(response)
                body = common.format_error(raw_body.decode(errors="backslashreplace")).strip()
            except Exception:
                logger.warning("Failed to read error response body", exc_info=True)

            if self.show_clickhouse_errors:
                err_code = response.headers.get(ex_header)
                if err_code:
                    err_str = f"Received ClickHouse exception, code: {err_code}"
                else:
                    err_str = f"HTTP driver received HTTP status {response.status}"

                if body:
                    err_str = f"{err_str}, server response: {body}"
            else:
                err_str = "The ClickHouse server returned an error"

            err_str = f"{err_str} (for url {self.url})"

        finally:
            response.close()

        raise OperationalError(err_str) if retried else DatabaseError(err_str) from None

    def _raw_request(
        self,
        data,
        params: dict[str, str],
        headers: dict[str, Any] | None = None,
        method: str = "POST",
        retries: int = 0,
        stream: bool = False,
        server_wait: bool = True,
        fields: dict[str, tuple] | None = None,
        error_handler: Callable = None,
        retry_body: Callable[[], Any] | None = None,
    ) -> HTTPResponse:
        if isinstance(data, str):
            data = data.encode()
        headers = dict_copy(self.headers, headers)
        attempts = 0
        final_params = {}
        if server_wait:
            final_params["wait_end_of_query"] = "1"
        # We can't actually read the progress headers, but we enable them so ClickHouse sends something
        # to keep the connection alive when waiting for long-running queries and (2) to get summary information
        # if not streaming
        if self._send_progress:
            final_params["send_progress_in_http_headers"] = "1"
        if self._progress_interval:
            final_params["http_headers_progress_interval_ms"] = self._progress_interval
        final_params = dict_copy(self.params, final_params)
        final_params = dict_copy(final_params, params)

        if self._autogenerate_query_id and "query_id" not in final_params:
            final_params["query_id"] = str(uuid.uuid4())

        url = f"{self.url}?{urlencode(final_params)}"
        kwargs = {"headers": headers, "timeout": self.timeout, "retries": self.http_retries, "preload_content": not stream}
        if self.server_host_name:
            kwargs["assert_same_host"] = False
            kwargs["headers"].update({"Host": self.server_host_name})
        if fields:
            kwargs["fields"] = fields
        else:
            kwargs["body"] = data
        check_conn_expiration(self.http)
        query_session = final_params.get("session_id")
        while True:
            attempts += 1
            if query_session:
                if query_session == self._active_session:
                    raise ProgrammingError(
                        "Attempt to execute concurrent queries within the same session. "
                        + "Please use a separate client instance per thread/process."
                    )
                # There is a race condition here when using multiprocessing -- in that case the server will
                # throw an error instead, but in most cases this more helpful error will be thrown first
                self._active_session = query_session
            try:
                response = self.http.request(method, url, **kwargs)
            except HTTPError as ex:
                if isinstance(ex.__context__, ConnectionResetError) and attempts == 1:
                    # The server closed the connection, probably because the Keep Alive has expired
                    # We should be safe to retry, as ClickHouse should not have processed anything on a connection
                    # that it killed.  We also only retry this once, as multiple disconnects are unlikely to be
                    # related to the Keep Alive settings
                    body = kwargs.get("body")
                    if retry_body is not None:
                        kwargs["body"] = retry_body()
                        logger.debug("Retrying remotely closed connection with rebuilt body")
                        continue
                    if body is None or isinstance(body, (bytes, bytearray, str)):
                        logger.debug("Retrying remotely closed connection")
                        continue
                logger.warning("Unexpected Http Driver Exception")
                err_url = f" ({self.url})" if self.show_clickhouse_errors else ""
                raise OperationalError(f"Error {ex} executing HTTP request attempt {attempts}{err_url}") from ex
            finally:
                if query_session:
                    self._active_session = None  # Make sure we always clear this
            if 200 <= response.status < 300 and not response.headers.get(ex_header):
                return response
            if response.status in (429, 503, 504):
                if attempts > retries:
                    self._error_handler(response, True)
                logger.debug("Retrying requests with status code %d", response.status)
            elif error_handler:
                error_handler(response)
            else:
                self._error_handler(response)

    def raw_query(
        self,
        query: str,
        parameters: Sequence | dict[str, Any] | None = None,
        settings: dict[str, Any] | None = None,
        fmt: str = None,
        use_database: bool = True,
        external_data: ExternalData | None = None,
        transport_settings: dict[str, str] | None = None,
    ) -> bytes:
        """
        See BaseClient doc_string for this method
        """
        body, params, fields = self._prep_raw_query(query, parameters, settings, fmt, use_database, external_data)
        return self._raw_request(body, params, fields=fields, headers=transport_settings).data

    def raw_stream(
        self,
        query: str,
        parameters: Sequence | dict[str, Any] | None = None,
        settings: dict[str, Any] | None = None,
        fmt: str = None,
        use_database: bool = True,
        external_data: ExternalData | None = None,
        transport_settings: dict[str, str] | None = None,
    ) -> io.IOBase:
        """
        See BaseClient doc_string for this method
        """
        body, params, fields = self._prep_raw_query(query, parameters, settings, fmt, use_database, external_data)
        return self._raw_request(body, params, fields=fields, stream=True, server_wait=False, headers=transport_settings)

    def _prep_raw_query(
        self,
        query: str,
        parameters: Sequence | dict[str, Any] | None,
        settings: dict[str, Any] | None,
        fmt: str,
        use_database: bool,
        external_data: ExternalData | None,
    ):
        if fmt:
            query += f"\n FORMAT {fmt}"
        final_query, bind_params = bind_query(query, parameters, self.server_tz)
        params = self._validate_settings(settings or {})
        if use_database and self.database:
            params["database"] = self.database
        fields = {}
        # Setup query body
        if external_data and not self.form_encode_query_params and isinstance(final_query, bytes):
            raise ProgrammingError("Binary query cannot be placed in URL when using External Data; enable form encoding.")
        # Setup additional query parameters and body
        if self.form_encode_query_params:
            body = b""
            fields["query"] = final_query
            fields.update(bind_params)
            if external_data:
                params.update(external_data.query_params)
                fields.update(external_data.form_data)
        elif external_data:
            params.update(bind_params)
            body = b""
            params["query"] = final_query
            params.update(external_data.query_params)
            fields = external_data.form_data
        else:
            params.update(bind_params)
            body = final_query
            fields = None
        return body, params, fields

    def _add_integration_tag(self, name: str):
        """
        Dynamically adds a product (like pandas or sqlalchemy) to the User-Agent string details section.
        """
        if not common.get_setting("send_integration_tags") or name in self._reported_libs:
            return

        try:
            ver = "unknown"
            try:
                ver = dist_version(name)
            except Exception:
                try:
                    mod = import_module(name)
                    ver = getattr(mod, "__version__", "unknown")
                except Exception:
                    pass

            product_info = f"{name}/{ver}"

            ua = self.headers.get("User-Agent", "")
            start = ua.find("(")
            if start == -1:
                return
            end = ua.find(")", start + 1)
            if end == -1:
                return

            details = ua[start + 1 : end].strip()

            if product_info in details:
                self._reported_libs.add(name)
                return

            new_details = f"{product_info}; {details}" if details else product_info
            new_ua = f"{ua[: start + 1]}{new_details}{ua[end:]}"
            self.headers["User-Agent"] = new_ua.strip()

            self._reported_libs.add(name)
            logger.debug("Added '%s' to User-Agent", product_info)

        except Exception as e:
            logger.debug("Problem adding '%s' to User-Agent: %s", name, e)

    def ping(self) -> bool:
        """
        See BaseClient doc_string for this method
        """
        try:
            response = self.http.request("GET", f"{self.url}/ping", timeout=3, preload_content=True)
            return 200 <= response.status < 300
        except HTTPError:
            logger.debug("ping failed", exc_info=True)
            return False

    def close_connections(self) -> None:
        self.http.clear()

    def close(self) -> None:
        if self._owns_pool_manager:
            self.http.clear()
            all_managers.pop(self.http, None)