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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.
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]
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
Non-free proprietary: 9.0.5.17 2023-09-19 Internet Information Services: Microsoft: Non-free proprietary 10.0.17763.1 2018-10-02 Jetty: Eclipse Foundation: Apache: 12.0.2 2023-10-10 Jexus Bing Liu Non-free proprietary 6.2.x 2020 lighttpd: Jan Kneschke (Incremental) BSD variant 1.4.77 2025-01-10 LiteSpeed Web Server: LiteSpeed Technologies
The destination MAC address is an STP multicast address. The IEEE 802 standard Bridge Group Address is 01:80:C2:00:00:00 . [ 11 ] However, several proprietary destination MAC addresses for STP exist, like the Cisco proprietary Per-VLAN Spanning Tree address 01:00:0C:CC:CC:CD [ 12 ] or the Extreme Networks address 03:04:08:00:07:00 , and may be ...
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 ...
dnsmasq caches DNS records, reducing the load on upstream nameservers and improving performance, and can be configured to automatically pick up the addresses of its upstream servers. dnsmasq accepts DNS queries and either answers them from a small, local cache or forwards them to a real, recursive DNS server.