Babysitter proxy-server

Expert skill for proxy server implementation, configuration, and traffic interception

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/network-programming/skills/proxy-server" ~/.claude/skills/a5c-ai-babysitter-proxy-server && rm -rf "$T"

manifest: library/specializations/network-programming/skills/proxy-server/SKILL.md

Proxy Server Skill

Expert skill for proxy server implementation, configuration, and network traffic interception.

Capabilities

Proxy Configuration: Configure Squid, mitmproxy, Charles, and nginx proxy
HTTP CONNECT Tunneling: Implement HTTP CONNECT for HTTPS tunneling
SOCKS Protocol: Configure SOCKS4/SOCKS5 proxy servers
Transparent Proxying: Implement transparent proxying with iptables/nftables
Traffic Analysis: Analyze proxy traffic and generate reports
Debugging: Debug proxy connection issues and SSL/TLS interception
PAC File Generation: Generate Proxy Auto-Configuration (PAC) files
Caching: Configure proxy caching strategies

Tools and Dependencies

```
Squid
```
- Caching proxy server
```
mitmproxy
```
- Interactive HTTPS proxy
```
nginx
```
- HTTP and reverse proxy
```
iptables/nftables
```
- Linux firewall for transparent proxy
```
Charles
```
- HTTP proxy/monitor
```
tinyproxy
```
- Lightweight proxy

Target Processes

http-proxy-server.js
socks5-proxy.js
transparent-proxy.js

Usage Examples

Squid HTTP Proxy Configuration

http_port 3128
acl localnet src 10.0.0.0/8
http_access allow localnet
cache_dir ufs /var/spool/squid 10000 16 256

Transparent Proxy with iptables

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 3129

mitmproxy Interception

mitmproxy -p 8080 --mode transparent
mitmdump -w traffic.flow

PAC File Example

function FindProxyForURL(url, host) {
    if (isPlainHostName(host)) return "DIRECT";
    if (dnsDomainIs(host, ".internal.com")) return "DIRECT";
    return "PROXY proxy.example.com:8080";
}

Quality Gates

Proxy functionality verified
SSL/TLS interception working
Transparent mode operational
Caching efficiency validated
Access control tested