Key features of Shadowsocks v1 include:

Shadowsocks proxy is a lightweight and efficient web proxy that allows proxying HTTP requests to web browsers. It is particularly useful in environments where a browser cannot run, such as in the browser-based testing or development. Shadowsocks v1 (client-side version) is the browser-based version of Shadowsocks, which runs directly in the browser. It is lightweight and efficient, as it does not require a separate server to run. Shadowsocks v1 supports common web requests, such as HTTP/1.1, and provides a clean and simple API for developers to use.

1. Lightweight: Shadowsocks v1 is lightweight in terms of both server and client resources.
2. Client-side: It is designed to run directly in the browser, making it ideal for browser-based environments.
3. Support for common web requests: It supports standard HTTP requests, including HTTP/1.1.
4. Lightweight API: The API is simple and efficient, making it easy to integrate into applications.
5. Use cases: Shadowsocks v1 is commonly used in browser-based testing, web automation, and client-side web development.

Limitations of Shadowsocks v1 include:

1. No support for HTTPS: Shadowsocks v1 only supports HTTP requests and does not handle HTTPS in the browser.
2. Requires HTTPS in the browser: To use Shadowsocks v1, you need to use HTTPS in the browser to enable proxying.
3. No support for advanced proxies: Shadowsocks v1 does not support advanced proxying mechanisms, such as proxy caching or proxy filtering.

In summary, Shadowsocks v1 is a lightweight and efficient client-side web proxy that is widely used in browser-based environments for proxying HTTP requests. It is particularly useful in scenarios where a browser cannot run, such as in browser-based testing or development.