async function handleRequest(request) { try { const url = new URL(request.url) const targetUrl = getTargetUrl(url, request.headers)

if (!targetUrl) { return errorJSON(‘No target URL specified’, 400, { usage: { query_param: ‘?url=https://example.com’, header: ‘X-Target-URL: https://example.com’, path: ‘/https://example.com’ } }) }

let target try { target = new URL(targetUrl) } catch (e) { return errorJSON(‘Invalid target URL’, 400, { provided: targetUrl }) }

// Forward original query params except control ones const passthru = new URLSearchParams() for (const [k, v] of url.searchParams) { if (![‘url’, ‘_cb’, ‘_t’].includes(k)) passthru.append(k, v) } if (passthru.toString()) target.search = passthru.toString()

// Build proxied request const proxyReq = buildProxyRequest(request, target) const upstream = await fetch(proxyReq)

return buildProxyResponse(upstream, request.method) } catch (error) { return errorJSON(‘Proxy request failed’, 500, { message: error.message, timestamp: new Date().toISOString() }) } }

function getTargetUrl(url, headers) { let t = url.searchParams.get(‘url’) || headers.get(‘X-Target-URL’) if (!t && url.pathname !== ‘/’) { const p = url.pathname.slice(1) if (p.startsWith(‘http’)) t = p } return t }

function buildProxyRequest(request, target) { const h = new Headers() const allow = [ ‘accept’,‘accept-language’,‘accept-encoding’,‘authorization’, ‘cache-control’,‘content-type’,‘origin’,‘referer’,‘user-agent’ ] for (const [k, v] of request.headers) { if (allow.includes(k.toLowerCase())) h.set(k, v) } h.set(‘Host’, target.hostname)

// Optional: spoof X-Forwarded-For if provided const spoof = request.headers.get(‘X-My-X-Forwarded-For’) h.set(‘X-Forwarded-For’, spoof || randomIP())

return new Request(target.toString(), { method: request.method, headers: h, body: [‘GET’,‘HEAD’].includes(request.method) ? null : request.body }) }

function buildProxyResponse(resp, method) { const h = new Headers() for (const [k, v] of resp.headers) { if (![‘content-encoding’,‘content-length’,‘transfer-encoding’].includes(k.toLowerCase())) { h.set(k, v) } } // Permissive CORS for tooling convenience h.set(‘Access-Control-Allow-Origin’, ‘’) h.set(‘Access-Control-Allow-Methods’, ‘GET, POST, PUT, DELETE, OPTIONS, PATCH, HEAD’) h.set(‘Access-Control-Allow-Headers’, ‘’)

if (method === ‘OPTIONS’) return new Response(null, { status: 204, headers: h }) return new Response(resp.body, { status: resp.status, statusText: resp.statusText, headers: h }) }

function errorJSON(msg, status=400, extra={}) { return new Response(JSON.stringify({ error: msg, …extra }), { status, headers: { ‘Content-Type’: ‘application/json’ } }) }

function randomIP() { return [1,2,3,4].map(() => Math.floor(Math.random()*255)+1).join(‘.’) }

</details>

### Automatizando implantação e rotação com FlareProx

FlareProx é uma ferramenta em Python que usa a Cloudflare API para implantar vários Worker endpoints e rotacionar entre eles. Isso fornece rotação de IP similar ao FireProx na rede da Cloudflare.

Configuração
1) Crie um Cloudflare API Token usando o template “Edit Cloudflare Workers” e obtenha seu Account ID no painel.
2) Configure o FlareProx:
```bash
git clone https://github.com/MrTurvey/flareprox
cd flareprox
pip install -r requirements.txt

Crie o arquivo de configuração flareprox.json:

{
"cloudflare": {
"api_token": "your_cloudflare_api_token",
"account_id": "your_cloudflare_account_id"
}
}

Uso do CLI

• Criar N Worker proxies:

python3 flareprox.py create --count 2

• Listar endpoints:

python3 flareprox.py list

• Endpoints de verificação de integridade:

python3 flareprox.py test

• Excluir todos os endpoints:

python3 flareprox.py cleanup

Roteamento de tráfego através de um Worker

• Formato por parâmetro de query:

curl "https://your-worker.account.workers.dev?url=https://httpbin.org/ip"

• Formato do cabeçalho:

curl -H "X-Target-URL: https://httpbin.org/ip" https://your-worker.account.workers.dev

• Formato do caminho (se implementado):

curl https://your-worker.account.workers.dev/https://httpbin.org/ip

• Exemplos de métodos:

# GET
curl "https://your-worker.account.workers.dev?url=https://httpbin.org/get"

# POST (form)
curl -X POST -d "username=admin" \
"https://your-worker.account.workers.dev?url=https://httpbin.org/post"

# PUT (JSON)
curl -X PUT -d '{"username":"admin"}' -H "Content-Type: application/json" \
"https://your-worker.account.workers.dev?url=https://httpbin.org/put"

# DELETE
curl -X DELETE \
"https://your-worker.account.workers.dev?url=https://httpbin.org/delete"

X-Forwarded-For controle

Se o Worker respeitar X-My-X-Forwarded-For, você pode influenciar o valor upstream de X-Forwarded-For:

curl -H "X-My-X-Forwarded-For: 203.0.113.10" \
"https://your-worker.account.workers.dev?url=https://httpbin.org/headers"

Uso programático

Use a biblioteca FlareProx para criar/listar/testar endpoints e rotear requisições a partir do Python.

</details>

**Integração Burp/Scanner**
- Aponte as ferramentas (por exemplo, Burp Suite) para a URL do Worker.
- Forneça o upstream real usando ?url= ou X-Target-URL.
- A semântica HTTP (methods/headers/body) é preservada enquanto mascara seu IP de origem atrás do Cloudflare.

**Notas operacionais e limites**
- O plano Free do Cloudflare Workers permite aproximadamente 100.000 requisições/dia por conta; use múltiplos endpoints para distribuir o tráfego se necessário.
- Workers rodam na rede do Cloudflare; muitos alvos verão apenas IPs/ASN do Cloudflare, o que pode contornar listas simples de permissão/negação por IP ou heurísticas geográficas.
- Use com responsabilidade e somente com autorização. Respeite o ToS e o robots.txt.

## Referências
- [FlareProx (Cloudflare Workers pass-through/rotation)](https://github.com/MrTurvey/flareprox)
- [Cloudflare Workers fetch() API](https://developers.cloudflare.com/workers/runtime-apis/fetch/)
- [Cloudflare Workers pricing and free tier](https://developers.cloudflare.com/workers/platform/pricing/)
- [FireProx (AWS API Gateway)](https://github.com/ustayready/fireprox)

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