Google Issues Guidance for Website Maintenance
The company advises using 503 status codes during PHP security patching to prevent index errors.
Updated on Oct. 27, 2026 in Software
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Google recently clarified how web operators should manage downtime following emergency PHP security patches released on October 21, 2026. The company advises using a 503 status code to signal temporary unavailability to search crawlers, preventing permanent indexing errors.
Why it matters
Improperly configured error pages can cause search engines to index maintenance notices or drop legitimate content from search results. This guidance arrives as administrators rush to address two critical PHP vulnerabilities that require taking sites offline to update.
Google recommends the 503 Service Unavailable status code for temporary outages, ideally accompanied by a Retry-After header. Using a 200 OK status for error pages leads search engines to index maintenance content, while 404 signals a permanent resource deletion.
The players
A global technology company that manages one of the world's primary search index architectures.
PHP
A server-side scripting language used by a significant portion of the web to build dynamic websites.
John Mueller
A Search Relations lead at Google who provides public technical guidance on crawling and indexing.
The details
When a web server is undergoing maintenance, returning a 503 code tells search engine crawlers to stop indexing and return later. Because a direct 503 response from PHP code fails if the server is down or the PHP service is disabled, Google suggests offloading these requests to a CDN rule or an external, non-PHP server. Administrators must also ensure that the robots.txt file—a text file that instructs crawlers which pages to avoid—remains accessible during the downtime to maintain site visibility.
Timeline
2011: Google publishes initial instructions for sending 503 responses via PHP.
2013: Google confirms that 200 status codes index maintenance content incorrectly.
2024: Google clarifies that 15-minute 503 outages are not considered extended.
October 21, 2026: Google issues 503 guidance and PHP releases emergency patches.
The Tech Race
This guidance reinforces search standards established in 2013 to protect site indexing. It follows a decade-long effort to standardize how web servers communicate with search crawlers during routine maintenance.
Web operators applying emergency PHP patches should implement a 503 response via a CDN to ensure search engines do not de-index their pages. Campaigns on Google Ads may pause if outages extend beyond current thresholds, requiring manual monitoring.
The takeaway
Maintaining site accessibility during security updates is critical to preserving search rankings. Operators should verify their server configuration and monitor search console reports following any extended maintenance window.
Further reading
For more on managing server communication, visit the Software section.
Source note: This article includes information reported by ALM Corp.
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