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from .ssl_ import create_urllib3_context, resolve_cert_reqs, resolve_ssl_version
def connection_requires_http_tunnel(
proxy_url=None, proxy_config=None, destination_scheme=None
):
"""
Returns True if the connection requires an HTTP CONNECT through the proxy.
:param URL proxy_url:
URL of the proxy.
:param ProxyConfig proxy_config:
Proxy configuration from poolmanager.py
:param str destination_scheme:
The scheme of the destination. (i.e https, http, etc)
"""
# If we're not using a proxy, no way to use a tunnel.
if proxy_url is None:
return False
# HTTP destinations never require tunneling, we always forward.
if destination_scheme == "http":
return False
# Support for forwarding with HTTPS proxies and HTTPS destinations.
if (
proxy_url.scheme == "https"
and proxy_config
and proxy_config.use_forwarding_for_https
):
return False
# Otherwise always use a tunnel.
return True
def create_proxy_ssl_context(
ssl_version, cert_reqs, ca_certs=None, ca_cert_dir=None, ca_cert_data=None
):
"""
Generates a default proxy ssl context if one hasn't been provided by the
user.
"""
ssl_context = create_urllib3_context(
ssl_version=resolve_ssl_version(ssl_version),
cert_reqs=resolve_cert_reqs(cert_reqs),
)
if (
not ca_certs
and not ca_cert_dir
and not ca_cert_data
and hasattr(ssl_context, "load_default_certs")
):
ssl_context.load_default_certs()
return ssl_context