Problem with proxies parameter in AsyncClient after update to 0.28.0

[diazdiego1]

After updating to version 0.28.1, the proxies parameter is no longer accepted in httpx.AsyncClient, resulting in the following error:

TypeError("AsyncClient.init() got an unexpected keyword argument 'proxies'")

Before this update, the proxies parameter was correctly used to configure proxies directly in the AsyncClient instance. However, with the current version, attempting to pass the proxies parameter to configure proxies results in the error mentioned above.

Steps to Reproduce:

1. Install version 0.27.2 of httpx in your virtual environment.
2. Try to use AsyncClient with the proxies parameter configured:

import httpx

proxy_config = {
    'http://': 'http://your.proxy.here',
    'https://': 'https://your.proxy.here'
}

async with httpx.AsyncClient(proxies=proxy_config) as client:
    response = await client.get('https://www.example.com')

How can I configure multiple proxies (both HTTP and HTTPS) in version 0.28.1 of httpx, considering that the proxies parameter is no longer accepted?

[PrithwishDas101]

HTTPX removed the deprecated "proxies=" argument in version 0.28.0. For different HTTP and HTTPS proxy configurations, use "mounts=" with "AsyncHTTPTransport" instances.

For example:

import httpx

proxy_config = {
"http://": httpx.AsyncHTTPTransport(
proxy="http://your-http-proxy.example:8080"
),
"https://": httpx.AsyncHTTPTransport(
proxy="http://your-https-proxy.example:8080"
),
}

async with httpx.AsyncClient(mounts=proxy_config) as client:
response = await client.get("https://www.example.com")

Replace the example proxy addresses with your actual proxy endpoints. If both schemes use the same proxy, you can use the simpler "proxy=" argument instead.

The official changelog confirms that "proxies=" was removed in 0.28.0 and recommends "mounts=" for complex configurations:
https://github.com/encode/httpx/blob/master/CHANGELOG.md

Proxy configuration docs:
https://www.python-httpx.org/advanced/proxies/