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203 Non-Authoritative Information (since HTTP/1.1) The server is a transforming proxy (e.g. a Web accelerator) that received a 200 OK from its origin, but is returning a modified version of the origin's response. [1]: §15.3.4 [1]: §7.7 204 No Content The server successfully processed the request, and is not returning any content.
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This is usually due to problems on the mail server, heavy internet traffic, or routing problems. Unfortunately, other than waiting, you won't be able to determine if the message is delayed or undeliverable. If possible, ask the sender to resend the message to see if you can get the message a second time. Check for emails in your Spam folder
v. t. e. The X-Forwarded-For ( XFF) HTTP header field is a common method for identifying the originating IP address of a client connecting to a web server through an HTTP proxy or load balancer . The X-Forwarded-For HTTP request header was introduced by the Squid caching proxy server's developers. [citation needed] X-Forwarded-For is also an ...
UltraSurf is a closed-source freeware Internet censorship circumvention product [ 2] created by UltraReach Internet Corporation. The software bypasses Internet censorship and firewalls using an HTTP proxy server, and employs encryption protocols for privacy. The software was developed by two different groups of Falun Gong practitioners at the ...
A forward cache is a cache outside the web server's network, e.g. in the client's web browser, in an ISP, or within a corporate network. A network-aware forward cache only caches heavily accessed items. A proxy server sitting between the client and web server can evaluate HTTP headers and choose whether to store web content.
DNS hijacking. DNS hijacking, DNS poisoning, or DNS redirection is the practice of subverting the resolution of Domain Name System (DNS) queries. [1] This can be achieved by malware that overrides a computer's TCP/IP configuration to point at a rogue DNS server under the control of an attacker, or through modifying the behaviour of a trusted ...
Do Not Track. [ 1]Do Not Track ( DNT) is a formerly official HTTP header field, designed to allow internet users to opt out of tracking by websites —which includes the collection of data regarding a user's activity across multiple distinct contexts, and the retention, use, or sharing of data derived from that activity outside the context in ...