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HTTP query parameter semantics
HTTP query parameters are the name–value pairs after the ? in a URI; RFC 9110 makes them part of resource identification, with UTF-8 and percent-encoding per RFC 3986.
HTTP referer
The HTTP referer (Referer) is an optional HTTP request header in which a browser tells a server the address of the page containing the link clicked.
HTTP session
An HTTP session is a sequence of related requests and responses between a user agent and a web service, preserving state such as a logged-in identity.
HTTP Strict Transport Security
HTTP Strict Transport Security (HSTS) is a web security mechanism, standardized as RFC 6797 in 2012, that forces browsers to connect to a server only over HTTPS.
HTTP TRACE method
The HTTP TRACE method, defined in HTTP/1.1 in June 1999, asks the final recipient to echo the request back for diagnosis; its echo enabled the 2003 Cross-Site Tracing attack.
HTTP tunnel
An HTTP tunnel carries non-HTTP traffic, typically TCP, UDP, or IP packets, inside HTTP proxy connections via the CONNECT method, extended to UDP and IP by the MASQUE standards.
HTTP/2
HTTP/2 is the second major version of the Hypertext Transfer Protocol, standardized by the IETF in 2015. It multiplexes many exchanges over one connection using binary frames and compressed headers.
HTTP/2 server push
HTTP/2 server push is an HTTP/2 feature, defined in RFC 7540 in 2015, letting a server send anticipated resources; it was disabled by default in Chrome in 2022.
HTTP/3
HTTP/3 is the third major version of the Hypertext Transfer Protocol, standardized by the IETF in 2022 and running over the QUIC transport instead of TCP.
HTTPS
HTTPS, or Hypertext Transfer Protocol Secure, is the use of HTTP over a TLS-encrypted connection, typically on port 443, authenticating websites and protecting web traffic from eavesdropping and tampering.
HTTR
The High Temperature engineering Test Reactor (HTTR) is a 30 MW gas-cooled test reactor at JAEA's Oarai institute in Ibaraki, Japan, the only HTGR in the country.
HTX Studio
HTX Studio is a DIY science and technology YouTube channel created in 2024 by Chinese creator He Shijie of Hangzhou, known for the AirDesk build and open-source hardware.
Hua Hong Semiconductor
Hua Hong Semiconductor (华虹半导体) is a Chinese pure-play semiconductor foundry and China's second-largest contract chipmaker after SMIC, making mature-node and specialty chips on 8-inch and 12-inch wafers.
Huadian Changji power station
Huadian Changji power station is a coal-fired cogeneration plant in Changji, Xinjiang, China, operated by China Huadian with two 330 MW units commissioned in 2011, heating the city.
Huadian Energy
Huadian Energy (华电能源) is a Chinese power generation and district heating company headquartered in Harbin, Heilongjiang. Controlled by China Huadian Group, it is the province's largest thermal power generator.
Huadian Laizhou power station
Huadian Laizhou power station is a coal-fired power station in Jincheng Town, Laizhou, Shandong, China, operated by Huadian Power International, with an operating capacity of 4,100 MW at the end of 2025.
Huadian Longkou power station
Huadian Longkou power station (华电龙口发电厂) is a coal-fired power station in Longkou, Yantai, Shandong, China, owned by Huadian Power International and rebuilt around two 660 MW ultra-supercritical cogeneration units completed in 2023 and 2025.
Huadian Qishuyan Gas power station
The Huadian Qishuyan Gas power station (江苏华电戚墅堰发电有限公司) is a natural gas-fired plant in Changzhou, Jiangsu, China, a backbone peaking source for the East China grid.
Huadian Weifang power station
Huadian Weifang power station is a 2,000 MW coal-fired power station in Weifang, Shandong Province, China, operated by Huadian Weifang Power Generation Company Limited, a subsidiary of Huadian Power International.
Huadian Xiangyang power station
Huadian Xiangyang power station (华电襄阳发电厂) is a 2,600 MW coal-fired power station in Xiaohe Town, Xiangyang, Hubei, China, built as a companion to the Three Gorges dam.
Huadian Xisaishan power station
Huadian Xisaishan power station (华电西塞山电厂) is a coal-fired power station in Huangshi, Hubei, China, on the Yangtze River with four units totaling at least 2,020 MW.
Huadian Zibo power station
Huadian Zibo power station (华电国际淄博热电), also known as Nanding Thermal Power (南定热电), is a 950 MW coal-fired combined heat and power station in Zibo, Shandong, China, owned by Huadian Power International.
Huagong Tech
Huagong Tech (华工科技) is a Wuhan-based Chinese manufacturer of laser processing equipment, optical communication modules, and sensors, founded in 1999 by Huazhong University of Science and Technology.
Huaibei Guo'an power station
Huaibei Guo'an power station is a coal-fired power station in Lieshan District, Huaibei, Anhui, China, whose two 320 MW units came online in 2000 and whose two 660 MW ultra-supercritical units were commissioned in 2026.
Huaibei Hushan power station
Huaibei Hushan power station (大唐淮北虎山发电厂) is a 1,320 MW coal-fired power plant in Huaibei, Anhui, China, owned by Datang, with two 660 MW units commissioned in 2013.
Huaibei Linhuan power station
Huaibei Linhuan power station, also known as the Wobei LHV Coal Power Project, is a 1,260 MW coal-fired plant in Huaibei, Anhui, China, burning waste coal since 2008.
Huaibei Mining
Huaibei Mining is a Chinese state-owned coal enterprise in Huaibei, Anhui Province, whose listed subsidiary Huaibei Mining Holdings trades on the Shanghai Stock Exchange as 600985.
Huaibei Pingshan power station
Huaibei Pingshan power station (平山电厂) is a coal-fired power station in Huaibei, Anhui, China, with three ultra-supercritical units totaling at least 2,670 MW, commissioned from 2015 to 2022.
Huaibei power station
Huaibei power station (大唐淮北发电厂) was a coal-fired power station in Huaibei, Anhui, China, operated by Datang; its units ran from 1973 until retirement in 2007 and 2020.
Huaihe Energy Holding Group
Huaihe Energy Holding Group (淮河能源) is a Chinese state-owned energy group based in Huainan, Anhui Province, whose main businesses are coal, electricity, and gas; it controls Huainan Mining and the Shanghai-listed Huaihe Energy (Group) Co.