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- CF-Cache-Status
- Purpose: Indicates the caching status of the request on Cloudflare’s CDN.
- Values:
- - `HIT`: The resource was served from Cloudflare’s cache.
- - `MISS`: The resource was not in the cache, so it was fetched from the origin server.
- - `EXPIRED`: The cached resource was expired and revalidated with the origin server.
- - `DYNAMIC`: The resource was not cached by Cloudflare due to its dynamic nature.
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- CF-RAY
- Purpose: A unique ID for the request generated by Cloudflare’s network. It can be used to track and troubleshoot individual requests.
- Value: Contains an alphanumeric string, typically used for debugging purposes.
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- CF-Request-ID
- Purpose: Similar to `CF-RAY`, it helps trace and track individual HTTP requests.
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- CF-Connecting-IP
- Purpose: Represents the original IP address of the client connecting through Cloudflare. This is useful because Cloudflare acts as a reverse proxy, so the actual client IP can otherwise be masked.
- Value: The original client's IP address.
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- CF-Visitor
- Purpose: Provides information about the visitor’s browser and device settings.
- Value: Typically includes JSON-encoded data such as the visitor's protocol (e.g., `"scheme":"https"`).
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- CF-Ipcountry
- Purpose: Identifies the country from which the client request originated.
- Value: A two-letter country code (e.g., `US`, `ID`).
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- CF-Bgj
- Purpose: Indicates Cloudflare’s use of Brotli compression for the response, which is a modern and more efficient compression algorithm than Gzip.
- Value: Set when Brotli compression is applied to the response.
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- CF-Polished
- Purpose: Relates to Cloudflare’s image optimization feature called Polish, which reduces image size for faster delivery.
- Values:
- - `lossy`: The image was compressed with lossy compression.
- - `lossless`: The image was compressed with lossless compression.
- - `off`: Image optimization was not applied.
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- CF-RocketLoader
- Purpose: Tells whether Rocket Loader, Cloudflare's feature for improving page load times by deferring JavaScript loading, was applied.
- Value: Typically either `active` or absent if not enabled.
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- CF-Worker
- Purpose: Indicates whether the request passed through a Cloudflare Worker, which is a serverless computing service offered by Cloudflare.
- Value: Specifies the ID of the Worker that processed the request.
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