# Google Issues 503 Guidance and Robots Rules Update

- Topic: tech
- Source: [Search Engine Journal](https://www.searchenginejournal.com/seo-pulse-google-explains-503s-robots-txt-limits-bracket-urls/594085/)
- Published: 2026-10-24
- Original: https://www.searchenginejournal.com/seo-pulse-google-explains-503s-robots-txt-limits-bracket-urls/594085/
- Language: en
- Image: https://cdn.searchenginejournal.com/wp-content/uploads/2026/10/seo-pulse-october-24-2026.jpg

## At a glance

- Google recommends a 503 status for PHP patch downtime, limiting it to 1–2 days to avoid index loss
- Robots.txt controls crawling only; AI training usage is separate and can be managed via Google‑Extended token
- Cloudflare‑OpenAI pilot surfaced millions of new pages for ChatGPT, but citations are not guaranteed
- Google clarified that bracket URLs and percent‑encoded brackets are treated as distinct URLs and should be used consistently

## Sources

- [Search Engine Journal](https://www.searchenginejournal.com/seo-pulse-google-explains-503s-robots-txt-limits-bracket-urls/594085/)

## The story

Google Search Central has issued new guidance for site owners dealing with PHP patch downtime, recommending the use of a 503 status code instead of generic 404 or 200 responses. The 503 should only be served for one to two days, as prolonged errors may cause URLs to drop from the index. In a separate post, Google clarified that standard robots.txt directives control crawling but do not dictate how content is later used, especially for AI training. The company highlighted the Google-Extended user‑agent token, which can signal whether crawled content may be used for Gemini model training. A Cloudflare‑OpenAI pilot identified hundreds of millions of new pages for ChatGPT, though it does not guarantee those pages will be cited. Google also addressed bracket URLs, noting that percent‑encoded brackets create distinct URLs and should be used consistently across links, sitemaps, and structured data. Finally, Google announced support for JPEG XL images in Google Images and Discover, expanding image format options for webmasters.

> Summary by Daily Read Bytes. [Read the original source](https://www.searchenginejournal.com/seo-pulse-google-explains-503s-robots-txt-limits-bracket-urls/594085/)