fetch server: TypeError with httpx 0.28+ - 'proxies' argument renamed to 'proxy'

[palashjhamnani]

TypeError: AsyncClient.init() got an unexpected keyword argument 'proxies' with httpx 0.28+

Description:

The fetch server fails when using the [--proxy-url] argument with httpx version 0.28.x due to an API change in httpx.

Environment:

mcp-server-fetch version: 2025.4.7 (latest)
httpx version: 0.28.1
Python version: 3.12
Error: TypeError: AsyncClient.init() got an unexpected keyword argument 'proxies'

Steps to Reproduce:

Install mcp-server-fetch with httpx 0.28+
Run with proxy: python -m mcp_server_fetch --proxy-url http://localhost:9000
Attempt to fetch any URL

References:

httpx changelog:
https://github.com/encode/httpx/blob/master/CHANGELOG.md (0.28.0 release notes mention the proxies → proxy rename)