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HTTP header Retrieved: 2012-02-09 W3C P3P Work Suspended "Public Key Pinning Extension for HTTP". IETF. Retrieved April 17, 2015. "Retry-After". HTTP
Task Force (IETF) and the World Wide Web Consortium (W3C), with work later moving to the IETF. HTTP/1 was finalized and fully documented (as version 1.0)
HTTP 502
Hypertext Transfer Protocol (HTTP) specification. It is defined in the HTTP/1.1 specification by the World Wide Web Consortium (W3C). According to the specification
discouraged by the World Wide Web Consortium (W3C). If a website is accessed from a HTTP Secure (HTTPS) connection and a link points to anywhere except
User agent
can be omitted or spoofed, so some websites use other detection methods. "W3C Definition of User Agent". www.w3.org. 2011-06-16. Retrieved 2018-10-20.