Remove `httpx` and use `requests` instead (#3305)

       request_timeout : 2.0        # default timeout in seconds, can be override by engine

       # max_request_timeout: 10.0  # the maximum timeout in seconds

       useragent_suffix : ""        # informations like an email address to the administrator

       pool_connections : 100       # Maximum number of allowable connections, or None for no limits. The default is 100.

       pool_maxsize : 10            # Number of allowable keep-alive connections, or None to always allow. The default is 10.

       enable_http2: True           # See https://www.python-httpx.org/http2/

       pool_connections : 100       # Number of different hosts

       pool_maxsize : 10            # Number of simultaneous requests by host

   # uncomment below section if you want to use a proxy

   #    proxies:

   #        all://:

   #        http:

   #            - http://proxy1:8080

   #            - http://proxy2:8080

   #        https:

   #            - http://proxy1:8080

   #            - http://proxy2:8080

   # uncomment below section only if you have more than one network interface

   #    source_ips:

   #        - 1.1.1.1

   #        - 1.1.1.2

   #        - fe80::/126

``request_timeout`` :

  Suffix to the user-agent searx uses to send requests to others engines.  If an

  engine wish to block you, a contact info here may be useful to avoid that.

``keepalive_expiry``:

  Number of seconds to keep a connection in the pool. By default 5.0 seconds.

.. _httpx proxies: https://www.python-httpx.org/advanced/#http-proxying

.. _requests proxies: https://requests.readthedocs.io/en/latest/user/advanced/#proxies

.. _PySocks: https://pypi.org/project/PySocks/

``proxies`` :

  Define one or more proxies you wish to use, see `httpx proxies`_.

  Define one or more proxies you wish to use, see `requests proxies`_.

  If there are more than one proxy for one protocol (http, https),

  requests to the engines are distributed in a round-robin fashion.

  - Proxy: `see <https://2.python-requests.org/en/latest/user/advanced/#proxies>`__.

  - SOCKS proxies are also supported: `see <https://2.python-requests.org/en/latest/user/advanced/#socks>`__

``source_ips`` :

  If you use multiple network interfaces, define from which IP the requests must

  be made. Example:

  * ``0.0.0.0`` any local IPv4 address.

  * ``::`` any local IPv6 address.

  * ``192.168.0.1``

  * ``[ 192.168.0.1, 192.168.0.2 ]`` these two specific IP addresses

  * ``fe80::60a2:1691:e5a2:ee1f``

  * ``fe80::60a2:1691:e5a2:ee1f/126`` all IP addresses in this network.

  * ``[ 192.168.0.1, fe80::/126 ]``

``retries`` :

  Number of retry in case of an HTTP error.

  On each retry, searx uses an different proxy and source ip.

``retry_on_http_error`` :

  Retry request on some HTTP status code.

  Example:

  * ``true`` : on HTTP status code between 400 and 599.

  * ``403`` : on HTTP status code 403.

  * ``[403, 429]``: on HTTP status code 403 and 429.

``enable_http2`` :

  Enable by default. Set to ``False`` to disable HTTP/2.

``max_redirects`` :

  30 by default. Maximum redirect before it is an error.

  be made. This parameter is ignored when ``proxies`` is set.

``locales:``

     api_key : 'apikey'

     disabled : True

     language : en_US

     #enable_http: False

     #enable_http2: False

     #retries: 1

     #retry_on_http_error: True # or 403 or [404, 429]

     #max_connections: 100

     #max_keepalive_connections: 10

     #keepalive_expiry: 5.0

     #proxies:

     #    http:

     #        - http://proxy1:8080

``display_error_messages`` : default ``True``

  When an engine returns an error, the message is displayed on the user interface.

``network``: optional

  Use the network configuration from another engine.

  In addition, there are two default networks:

  * ``ipv4`` set ``local_addresses`` to ``0.0.0.0`` (use only IPv4 local addresses)

  * ``ipv6`` set ``local_addresses`` to ``::`` (use only IPv6 local addresses)

.. note::

   A few more options are possible, but they are pretty specific to some

export DOCS_BUILD

buildenv() {

    SEARX_DEBUG=1 pyenv.cmd python utils/build_env.py 2>&1 \

        | prefix_stdout "${_Blue}BUILDENV${_creset}  "

    SEARX_DEBUG=1 pyenv.cmd python utils/build_env.py 2>&1

    return "${PIPESTATUS[0]}"

}

sphinxcontrib-programoutput==0.17

sphinx-autobuild==2021.3.14

linuxdoc==20211220

aiounittest==1.4.1

certifi==2022.5.18.1

Brotli==1.0.9

babel==2.9.1

certifi==2022.5.18.1

flask-babel==2.0.0

flask==2.1.1

jinja2==3.1.2

langdetect==1.0.9

lxml==4.9.0

pygments==2.8.0

python-dateutil==2.8.2

pyyaml==6.0

httpx[http2]==0.23.0

Brotli==1.0.9

uvloop==0.16.0; python_version >= '3.7'

uvloop==0.14.0; python_version < '3.7'

httpx-socks[asyncio]==0.7.4

langdetect==1.0.9

requests[socks]==2.28.1

setproctitle==1.2.2

from json import loads

from urllib.parse import urlencode

from httpx import HTTPError

from requests import RequestException

from searx import settings

from searx.data import ENGINES_LANGUAGES

from searx.network import get as http_get

from searx.poolrequests import get as http_get

from searx.exceptions import SearxEngineResponseException

    try:

        return backend(query, lang)

    except (HTTPError, SearxEngineResponseException):

    except (RequestException, SearxEngineResponseException):

        return []