203 Non-Authoritative Information
The server successfully processed the request but is returning information from a third-party source, not the original server.
Use Cases
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How does 203 Non-Authoritative Information affect Search Engine Optimization (SEO)?
How does Google treat Successful 2xx HTTP response status codes?
Google considers the content for indexing. If the content suggests an error, for example an empty page or an error message, Search Console will show a soft 404 error.
Information from Internet Standards from IEFT
The 203 (Non-Authoritative Information) status code indicates that the request was successful but the enclosed content has been modified from that of the origin server's 200 (OK) response by a transforming proxy (Section 7.7). This status code allows the proxy to notify recipients when a transformation has been applied, since that knowledge might impact later decisions regarding the content. For example, future cache validation requests for the content might only be applicable along the same request path (through the same proxies). A 203 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see Section 4.2.2 of [CACHING]).
Source: 203 Non-Authoritative Information