Editing Httpd

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[[File:Web server serving static content.png|thumb|221x144px|right|PC clients communicating via network with an '''HTTPd''' process serving static content only]]
'''HTTPd''' is a [[software]] [[computer program|program]] that usually runs in the background (i.e. a so-called "[[daemon (computing)|daemon]]"), as a [[process (computing)|process]], and plays the role of a [[server (computing)|server]] in a [[client–server model]] using the [[HTTP]] and/or [[HTTPS]] [[network protocol]](s).

The process waits for the incoming client requests and for each request it answers by replying with requested information, including the sending of the requested [[web resource]], or with an [[List of HTTP status codes|HTTP error message]].

'''HTTPd''' stands for ''[[Hypertext Transfer Protocol]] [[daemon (computing)|daemon]]''.

It usually is the main software part of an '''[[HTTP server]]''' better known as a '''[[web server]]'''.<ref name="http-server-httpd">{{Cite web|url=https://httpd.apache.org/docs/2.4/programs/|title=Server and supporting programs|author=|publisher=Apache: HTTPd server project|year=2021|access-date=2021-11-19|language=en}}</ref>

Some commonly used implementations are:
* [[Apache HTTP Server]]
* [[BusyBox]] httpd
* [[Lighttpd]] HTTP server
* [[Nginx]] HTTP and [[reverse proxy]] server
* OpenBSD's [[OpenBSD#Subprojects|httpd]] (<small>since OpenBSD 5.6</small>)

==See also==
* [[Web server]]
* [[Comparison of web server software]]

==References==
{{Reflist}}

==External links==
* [https://httpd.apache.org/docs/2.4/programs/httpd.html Example of an HTTPd: httpd - Apache Hypertext Transfer Protocol Server]

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