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fix(mimo-free): add Chrome User-Agent rotation to bypass anti-abuse gate

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Fixes #1933 — upstream returns 403 "Illegal access" on the chat endpoint
when requests lack a browser-like User-Agent. Mirror OmniRoute mimocode
executor: rotate across 3 Chrome UA strings on both bootstrap and chat.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
decolua
2026-06-21 16:51:47 +07:00
parent 7baf293ccb
commit 36153fedbd
2 changed files with 72 additions and 1 deletions
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13
open-sse/executors/mimo-free.js
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@@ -12,6 +12,13 @@ const JWT_FALLBACK_TTL_SEC = 3000;
const JWT_EXPIRY_BUFFER_MS = 300000;
const SESSION_CHARS = "abcdefghijklmnopqrstuvwxyz0123456789";
// Anti-abuse gate: upstream rejects requests without a Chrome-like User-Agent with 403 "Illegal access"
const USER_AGENTS = [
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
];
// Anti-abuse gate marker: the free chat endpoint returns 403 "Illegal access"
// unless a system message contains this exact MiMoCode signature substring.
export const MIMO_SYSTEM_MARKER =
@@ -76,7 +83,10 @@ async function bootstrapJwt(proxyOptions = null) {
const response = await proxyAwareFetch(BOOTSTRAP_URL, {
method: "POST",
headers: { "Content-Type": "application/json" },
headers: {
"Content-Type": "application/json",
"User-Agent": USER_AGENTS[Math.floor(Math.random() * USER_AGENTS.length)],
},
body: JSON.stringify({ client: generateFingerprint() }),
}, proxyOptions);
@@ -108,6 +118,7 @@ export class MimoFreeExecutor extends BaseExecutor {
return {
"Content-Type": "application/json",
"X-Mimo-Source": "mimocode-cli-free",
"User-Agent": USER_AGENTS[Math.floor(Math.random() * USER_AGENTS.length)],
"x-session-affinity": this.sessionId,
"Accept": stream ? "text/event-stream" : "application/json",
};