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httpd
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<p>HTTPd is a <a href="/facts/Software/RP79lVSW">software</a> <a href="/facts/Computer_program/e38jH9N9">program</a> that usually runs in the background, as a <a href="/facts/Process_(computing)/Vcq7EnUV">process</a>, and plays the role of a <a href="/facts/Server_(computing)/dEaYFD7r">server</a> in a <a href="/facts/Client%E2%80%93server_model/FSnf27C5">client–server model</a> using the <a href="/facts/HTTP/TWtvf7JD">HTTP</a> and/or <a href="/facts/HTTPS/MSWYz4zo">HTTPS</a> <a href="/facts/Network_protocol/5uady7cB">network protocol</a>(s). </p><p>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 <a href="/facts/Web_resource/42wbl7QV">web resource</a>, or with an <a href="/facts/List_of_HTTP_status_codes/nTtX2f6r">HTTP error message</a>. </p><p>HTTPd stands for <i><a href="/facts/Hypertext_Transfer_Protocol/TWtvf7JD">Hypertext Transfer Protocol</a> <a href="/facts/Daemon_(computer_software)/bzuEVGGX">daemon</a></i>. </p><p>It usually is the main software part of an <a href="/facts/HTTP_server/A4GS6thA">HTTP server</a> better known as a <a href="/facts/Web_server/A4GS6thA">web server</a>. </p><p>Some commonly used implementations are: </p> <ul><li><a href="/facts/Apache_HTTP_Server/tcmWYYUq">Apache HTTP Server</a></li> <li><a href="/facts/BusyBox/CRv85u7S">BusyBox</a> httpd</li> <li><a href="/facts/Lighttpd/NTJLA4H6">Lighttpd</a> HTTP server</li> <li><a href="/facts/Nginx/AlTYUuTp">Nginx</a> HTTP and <a href="/facts/Reverse_proxy/bN4HFUEC">reverse proxy</a> server</li> <li>OpenBSD's <a href="/facts/OpenBSD/xmPS9tek">httpd</a> (since OpenBSD 5.6)</li></ul>