What causes "response.message ?? `Error code ${response.code}`" in DIYgod/RSSHub?

Inspect the response.code and response.message to identify the specific Bilibili error.

response.message ?? `Error code ${response.code}`

Error message

response.message ?? `Error code ${response.code}`

What it means

Generic Error thrown by the message-at route when Bilibili's /x/msgfeed/at API returns a non-zero code. The error message is response.message if present, otherwise a formatted 'Error code N' string. This fires after a successful authenticated request but when Bilibili returns an error payload (e.g., rate limiting, session issues, or API changes).

Source

Thrown at lib/routes/bilibili/message-at.ts:105

    const cookie = config.bilibili.cookies[uid];
    if (cookie === undefined) {
        throw new ConfigNotFoundError('缺少对应 uid 的 Bilibili 用户登录后的 Cookie 值');
    }

    const response = await ofetch<AtResponse>('https://api.bilibili.com/x/msgfeed/at', {
        query: {
            platform: 'web',
            build: 0,
            mobi_app: 'web',
        },
        headers: {
            Referer: 'https://message.bilibili.com/',
            Cookie: cookie,
        },
    });

    if (response.code !== 0) {
        throw new Error(response.message ?? `Error code ${response.code}`);
    }

    const items: DataItem[] = (response.data.items || []).map((item) => {
        const atUser = item.user;
        const atItem = item.item;
        const sourceContent = atItem.source_content;

        let description = `<p><strong>${atUser.nickname}</strong> @了你：</p>`;
        description += `<blockquote>${sourceContent}</blockquote>`;

        if (atItem.image) {
            description += `<p><img src="${atItem.image.replace('http://', 'https://')}" /></p>`;
        }

        description += `<p>来自：${atItem.business} - ${atItem.title}</p>`;

        // Generate link with root_id for direct navigation
        let link = atItem.uri;

View on GitHub (pinned to bed535e087)

Solutions

Inspect the response.code and response.message to identify the specific Bilibili error.
If -101 or -6, refresh the cookie via browser re-login.
If -509, reduce polling frequency and increase cache expiry.
If the error persists, verify the msgfeed API hasn't changed by testing the endpoint manually.

Example fix

// before
if (response.code !== 0) {
    throw new Error(response.message ?? `Error code ${response.code}`);
}

// after: include actionable context
if (response.code !== 0) {
    const hint = response.code === -101 ? ' (cookie may be expired — refresh BILIBILI_COOKIE)'
        : response.code === -509 ? ' (rate limited — reduce frequency)'
        : '';
    throw new Error(`msgfeed/at error ${response.code}: ${response.message ?? 'unknown'}${hint}`);
}

Defensive patterns

Strategy: try-catch

Type guard

interface BilibiliApiResponse {
    code: number;
    message?: string;
    data?: unknown;
}

function isApiError(response: BilibiliApiResponse): boolean {
    return response.code !== 0;
}

Try / catch

try {
    const response = await ofetch<AtResponse>(url, {...});
    if (response.code !== 0) {
        const hint = response.code === -101 ? ' (refresh cookie)'
            : response.code === -509 ? ' (rate limited)'
            : '';
        throw new Error(`${response.message ?? `code ${response.code}`}${hint}`);
    }
} catch (e) {
    logger.error(`msgfeed/at failed: ${e.message}`);
    throw e;
}

Prevention

Inspect the code value to distinguish cookie vs rate-limit issues.
Cache msgfeed results to reduce API calls.
Handle -509 with exponential backoff.
Log full error context for diagnosis.

When it happens

Trigger: The msgfeed/at endpoint returns response.code !== 0 despite a valid cookie being attached. Possible codes: -101 (not logged in / cookie issues at a sub-service level), -509 (rate limited), -7 (account restricted), or temporary backend errors.

Common situations: Polling the mentions feed too frequently; cookie partially expired (SESSDATA present but DedeUserID mismatch); Bilibili added new requirements to the msgfeed endpoint; account flagged for API automation.

Related errors

AI-assisted analysis of DIYgod/RSSHub@bed535e087 (2026-08-12). Data as JSON: /api/errors/2fdc256d38028f84. Report an issue: GitHub.