Fix: Update version to 0.1.5 in pyproject.toml

Merge pull request #2 from 5enxia/copilot/add-http-header-authentication

Fix: Create separate ClientFactory per URL to preserve headers

Fix context manager tests and update HTTP client initialization for multiple URLs

Remove Basic Auth and make headers configurable per URL

Add authentication usage example and update README

Add HTTP header and auth authentication support

Initial plan

Change version

init