Response compression
Compression reduces transferred bytes when the client advertises a supported content encoding.
How it works
The server selects gzip, Brotli, or identity based on Accept-Encoding and should vary caches on that decision.
How to validate it
Measure compressed and uncompressed sizes, Content-Encoding, Vary, and total latency for representative HTML, JSON, CSS, and script bodies.
Common failure
Precompressed content with an incorrect Content-Length or missing Vary header can produce corrupted responses or cache confusion.
Machine-readable editions
The same article is available as Markdown and JSON. These alternates are linked here but are not submitted through the sitemap or IndexNow.