What Is an ETag Header and How Does It Work?
An ETag header is the small, quoted string a server attaches to a response so that later on, the browser can ask "has this changed since I last saw it?" instead of downloading the whole file...
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HTTP headers, status codes and redirects, explained.
HTTP Response Headers: What Each One Does, What to Send
A response is a status line, a set of headers and a body. The body is what you see; the headers decide how the browser treats it. Every common header family, with the value to send.
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HTTP Status Codes: The Fifteen That Matter, and When
There are around sixty registered status codes. A working web server uses perhaps fifteen. Those fifteen, what each tells a browser and a crawler, and the codes that look right and are not.
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