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Under HTTP 1.0, connections should always be closed by the server after sending the response. [1]Since at least late 1995, [2] developers of popular products (browsers, web servers, etc.) using HTTP/1.0, started to add an unofficial extension (to the protocol) named "keep-alive" in order to allow the reuse of a connection for multiple requests/responses.
Keepalive time is the duration between two keepalive transmissions in idle condition. TCP keepalive period is required to be configurable and by default is set to no less than 2 hours. Keepalive interval is the duration between two successive keepalive retransmissions, if acknowledgement to the previous keepalive transmission is not received.
The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API). 502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from the upstream server. 503 Service Unavailable
HTTP is designed to permit intermediate network elements to improve or enable communications between clients and servers. High-traffic websites often benefit from web cache servers that deliver content on behalf of upstream servers to improve response time. Web browsers cache previously accessed web resources and reuse them, whenever possible ...
Nginx is free and open-source software, released under the terms of the 2-clause BSD license. A large fraction of web servers use Nginx, [10] often as a load balancer. [11] A company of the same name was founded in 2011 to provide support and NGINX Plus paid software. [12] In March 2019, the company was acquired by F5 for $670 million. [13]
Nginx 1.5.9 and earlier [4] Vulnerable to Slowloris attack on the TLS handshake process: Apache HTTP Server 2.2.15 and earlier [5] Internet Information Services (IIS) 7.0 and earlier [6] Because Slowloris exploits problems handling thousands of connections, the attack has less of an effect on servers that handle large numbers of connections well.
Symmetric connections such as Symmetric Digital Subscriber Line (SDSL) and T1, however, offer identical upstream and downstream rates. If a node A on the Internet is closer (fewer hops away) to the Internet backbone than a node B, then A is said to be upstream of B or conversely, B is downstream of A. Related to this is the idea of upstream ...
Type 25 - Hash Timeout. Type 26 - Hash Request. Type 27 - Hash Response. Type 28 - Check Bandwidth. Type 29 - Set Audio Sample Access. Type 30 - Set Video Sample Access. Type 31 - Throttle Begin. Type 32 - Throttle End. Type 33 - DRM Notify. Type 34 - RTMFP Sync. Type 35 - Query IHello. Type 36 - Forward IHello. Type 37 - Redirect IHello. Type ...