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3xx Series
Terminal (Do not automatically retry)
304 Not Modified
Indicates that the resource has not been modified since the version specified by the request headers If-Modified-Since or If-None-Match.
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SEO Impact
Excellent for crawl budget optimization. Tells Googlebot the page hasn't changed so it can focus on other pages.
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Common Causes
- 1Client requesting a cached asset
- 2ETag matches existing resource
Code Examples
Node.js (Express)
// Usually automatically handled by Express via ETag.