[Feature request] Provide option to configure the HTTPX AsyncClient

[Kilo59]

Describe the feature you'd like

I'd like to be able to customize the config for the HTTPX AsyncClient used to load the openid config (or any other HTTPX clients that are making external requests).
https://github.com/intility/fastapi-azure-auth/blob/main/fastapi_azure_auth/openid_config.py#L75

I am in a locked down environment where I need to be able to set the a custom SSL cert.
https://www.python-httpx.org/advanced/ssl/#working-with-ssl_cert_file-and-ssl_cert_dir

Additional context

My initial idea is to allow the OpenIdConfig class constructor to take parameter object that is then passed to the created AsyncClient.

[JonasKs]

It says

httpx does respect the SSL_CERT_FILE and SSL_CERT_DIR environment variables by default.

Wouldn't it be sufficient for you to set those env vars?

[Kilo59]

It says

httpx does respect the SSL_CERT_FILE and SSL_CERT_DIR environment variables by default.

Wouldn't it be sufficient for you to set those env vars?

No it isn't. I need to be able to setup a custom SSL context.
Furthermore, relying on ENV variables is always going to run into problems when you have several services that may need slightly different SSL Contexts.