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fix: add request body size limit to proxy #7

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fix: add request body size limit to proxy #7

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15 changes: 14 additions & 1 deletion proxy/model-proxy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import { Transform } from 'stream';
const ANTHROPIC_FALLBACK = 'https://api.anthropic.com';
const MODEL_PATHS = ['/v1/messages'];
const REQUEST_TIMEOUT_MS = 5 * 60 * 1000; // 5 min per request
const MAX_BODY_SIZE = 50 * 1024 * 1024; // 50 MB

const PRICING_PER_M = {
deepseek: { input: 0.44, output: 0.87 },
Expand Down Expand Up @@ -274,8 +275,20 @@ export function startModelProxy({ targetUrl, apiKey, startPort = 3200, backends,
}

const chunks = [];
clientReq.on('data', c => chunks.push(c));
let bodySize = 0;
clientReq.on('data', c => {
bodySize += c.length;
if (bodySize > MAX_BODY_SIZE) {
console.error(`[MODEL-PROXY] #${reqCount} BODY_TOO_LARGE (${bodySize} bytes)`);
clientRes.writeHead(413, { 'content-type': 'application/json' });
clientRes.end(JSON.stringify({ error: { message: 'Request body too large' } }));
clientReq.destroy();
return;
}
chunks.push(c);
});
clientReq.on('end', () => {
if (bodySize > MAX_BODY_SIZE) return;
const body = Buffer.concat(chunks);
const opts = {
hostname: dest.hostname,
Expand Down