FM 9-01 Chapter 9 · Web and developer
HTTP status codes
Every registered HTTP status code with meaning, typical cause and cacheability, plus common nginx and Cloudflare codes.
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Standard codes follow the IANA status code registry, mostly defined in RFC 9110. Cacheable by default means a cache may store the response without Cache-Control or Expires (RFC 9110 §15.1). Non-standard codes are vendor specific and never sent by other servers.