Setting `host` in `Configuration` causes credentials to be sent in the clear

El informe menciona Configuration(host=...), ApiClient(configuration) y MonitorsApi.list_monitors(), pero no indica ningún archivo de código fuente ni ruta de prueba. Empieza siguiendo cómo el host configurado selecciona el esquema de la solicitud y compáralo con la ruta del host predeterminado. Se considera terminado cuando los hosts configurados explícitamente usan TLS de forma predeterminada y las credenciales nunca se envían mediante la solicitud HTTP inicial; añade una prueba de regresión para el caso reproducido.

Describe the bug
Setting host in the Configuration ctor causes credentials to be sent in the clear.

To Reproduce

Take this example:

import os

from datadog_api_client import ApiClient, Configuration
from datadog_api_client.v1.api.monitors_api import MonitorsApi

configuration = Configuration(
    host=os.environ['DATADOG_HOST'],
)
configuration.api_key["apiKeyAuth"] = os.environ['DATADOG_API_KEY']
configuration.api_key["appKeyAuth"] = os.environ['DATADOG_APP_KEY']
configuration.debug = True
with ApiClient(configuration) as api_client:
    monitors_api = MonitorsApi(api_client)
    monitors = monitors_api.list_monitors()

print('{} monitors'.format(len(monitors)))

You can tell from the debug output that we're not doing TLS:

send: b'GET /api/v1/monitor HTTP/1.1\r\nHost: <subdomain>.datadoghq.com\r\nAccept: application/json\r\n<snip>\r\n\r\n'
reply: 'HTTP/1.1 308 Permanent Redirect\r\n'
header: Date: Fri, 08 Dec 2023 23:22:03 GMT
header: Content-Length: 0
header: Connection: keep-alive
header: location: https://<subdomain>.datadoghq.com/api/v1/monitor
header: x-content-type-options: nosniff
header: strict-transport-security: max-age=31536000; includeSubDomains; preload
send: b'GET /api/v1/monitor HTTP/1.1\r\nHost: <subdomain>.datadoghq.com\r\nAccept: application/json\r\n<snip>\r\n\r\n'
reply: 'HTTP/1.1 200 OK\r\n'
header: Date: Fri, 08 Dec 2023 23:22:03 GMT
header: Content-Type: application/json
header: Transfer-Encoding: chunked
header: Connection: keep-alive
header: etag: W/"721e351f3b20293a0d2bc1301301df83"
header: x-frame-options: SAMEORIGIN
header: content-security-policy: frame-ancestors 'self'; report-uri https://logs.browser-intake-datadoghq.com/api/v2/logs?dd-api-key=pube4f163c23bbf91c16b8f57f56af9fc58&dd-evp-origin=content-security-policy&ddsource=csp-report&ddtags=site%3Adatadoghq.com
header: vary: Accept-Encoding
header: content-encoding: gzip
header: x-ratelimit-limit: 1000
header: x-ratelimit-period: 10
header: x-ratelimit-remaining: 999
header: x-ratelimit-reset: 7
header: x-ratelimit-name: get_all_monitors
header: x-content-type-options: nosniff
header: strict-transport-security: max-age=31536000; includeSubDomains; preload
240 monitors

That double request is pretty clearly an HTTP→HTTPS redirect. Wireshark confirms as much. Oddly, whatever the default for host is doesn't do this, but I didn't realize until much later that setting host isn't required, see the Additional Context section. Initially, I was under the impression that configuration of what DD tenant I was was required.

Expected behavior
TLS is enabled by default … and ideally only switch off very explicitly. Certainly overriding things like hostname don't then also remove TLS, in addition…

Environment and Versions (please complete the following information):
A clear and precise description of your setup:

• version for this project in use: 2.19.0
• services, libraries, languages and tools list and versions: the minimal example above

Additional context
I ended up setting host almost by accident. Initially, I was getting 403 Forbidden from the API, and wasn't sure why; I was using the "Getting Started" example, and setting an API key. It turns out DD requires both an API key and an "app" key (the README does note this, but I missed that in my first pass), which is somewhat unusual. So, AFAICT, I wasn't authenticated, but since the wrong HTTP status was getting returned, that never clicked, and I tried other things (such as configuring my host) prior to returning to the what-if of "perhaps it is, indeed, authn?"

I'm not clear on why one can construct a DD client without (full) credentials without error in the first place.