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Topics referred to by the same term
header in Wiktionary, the free dictionary. Header may refer to: Header (computing), supplemental data at the beginning of a data block E-mail header HTTP
Header
Supplemental data in an IP packet
An IP header is header information at the beginning of an Internet Protocol (IP) packet. An IP packet is the smallest message entity exchanged via the
IP_header
Information at the beginning of data which describes or defines the data
In information technology, header is supplemental data placed at the beginning of a block of data being stored or transmitted. In data transmission, the
Header_(computing)
HTTP header field
Do Not Track (DNT) is a deprecated non-standard HTTP header field designed to allow Internet users to opt out of tracking by websites, which includes the
Do_Not_Track
Mail sent using electronic means
defined by the MIME header lines. The header is separated from the body by a blank line. RFC 5322 specifies the syntax of the email header. Each email message
Building of structures from individual units of stone, bricks, or blocks
brickwork type in which headers are laid alternatingly to stretchers, is called "headers and stretchers" (also "header and stretcher", "header-and-stretcher masonry"
Masonry
Type of simple electrical connector
A pin header (or simply, header) is a form of electrical connector. A male pin header consists of one or more rows of metal pins molded into a plastic
Pin_header
HTTP header fields. A core set of fields is standardized by the Internet Engineering Task Force (IETF) in RFC 9110 and 9111. The Field Names, Header Fields
List_of_HTTP_header_fields
Principal protocol used for transmission of datagrams across an IP network
using a pseudo header that contains some of the same information from the real IPv4 header. The pseudo header is not the real IPv4 header used to send an
User_Datagram_Protocol
Text that is separated from the body text and appears at the top of a page
In typography and word processing, a page header (or simply header) is text that is separated from the body text and appears at the top of a printed page
Page_header
Topics referred to by the same term
Look up doubleheader or double-header in Wiktionary, the free dictionary. Doubleheader or double header may refer to: Doubleheader (baseball), two baseball
Doubleheader
Application layer protocol
header fields that describe the body. In particular, not all headers were considered part of the entity. The term entity header referred to a header that
HTTP
Fourth version of the Internet Protocol
first header field in an IP packet is the Version field. For IPv4, this is always equal to 4. Internet Header Length (IHL): 4 bits The IPv4 header is variable
IPv4
Masonry made of bricks and mortar
bottom surfaces are called beds Ends or narrow surfaces are called headers or header faces Sides or wider surfaces are called stretchers or stretcher faces
Brickwork
Windows Bitmap image file format family
device-independent bitmap representation is commonly called a DIB: it consists of a DIB header, optional color information, and pixel data, describing the image independently
BMP_file_format
Principal protocol used to stream data across an IP network
TCP Version 3.1 Header Format (February 1978) IEN #40 Transmission Control Protocol Draft Version 4 (June 1978) IEN #44 Latest Header Formats (June 1978)
Transmission_Control_Protocol
Optimized type of file in computer programming
precompiled headers may significantly reduce compilation time, especially when applied to large header files, header files that include many other header files
Precompiled_header
Type of data transmitted by a web browser
In computing, the User-Agent header is an HTTP header intended to identify the user agent responsible for making a given HTTP request. Whereas the character
User-Agent_header
2006 American film
Header is a 2006 horror film directed by Archibald Flancranstin, and written Michael E. Kennedy. It is based on the 1995 novella Header by Edward Lee
Header_(film)
Gay bar in Seattle
The Double Header was a gay bar located at 407 2nd Avenue S in Seattle's Pioneer Square neighborhood, in the U.S. state of Washington. The establishment
The_Double_Header
Secure network protocol suite
unauthenticated) IPv4 header fields are DSCP/ToS, ECN, Flags, Fragment Offset, TTL and Header Checksum. In IPv6, the AH protects most of the IPv6 base header, AH itself
IPsec
Text file processor instruction to include the content of one file into another
copybook. Generally, for C/C++ the include directive is used to include a header file, but can include any file. Although relatively uncommon, it is sometimes
Include_directive
Topics referred to by the same term
Look up tripleheader in Wiktionary, the free dictionary. Triple header or variant thereof, may refer to: Baseball tripleheader, three baseball games on
Triple_header
Malicious website exploit
request's headers contain X-Requested-With (used by Ruby on Rails before v2.0 and Django before v1.2.5), or checking the HTTP Referer header and/or HTTP
Cross-site_request_forgery
Mechanism to detect corruption in the header of an IPv4 packet
also called the IPv4 header checksum is a checksum used in version 4 of the Internet Protocol (IPv4) to detect corruption in the header of IPv4 packets. It
Internet_checksum
experimental conditions. 100 Continue The server has received the request headers and the client should proceed to send the request body (in the case of
List_of_HTTP_status_codes
Access control method for the HTTP network communication protocol
when making a request. In basic HTTP authentication, a request contains a header field in the form of Authorization: Basic <credentials>, where <credentials>
Basic_access_authentication
Technique used in association football
A header is a technique that is used in association football to control the ball using the head to pass, shoot, or clear. This can be done from a standing
Header_(association_football)
Internet protocol used for error messages in network operations
an IP datagram first decrements the time to live (TTL) field in the IP header by one. If the resulting TTL is 0, the packet is discarded and an ICMP time
Internet Control Message Protocol
Internet_Control_Message_Protocol
C standard library header file
functions in the <cmath> header (placed in namespace std), provides additional mathematical special functions in this header. Most of the mathematical
C_mathematical_functions
Standard file format for executables, object code, shared libraries, and core dumps
of one ELF header, followed by file data. The data can include: Program header table, describing zero or more memory segments Section header table, describing
Executable and Linkable Format
Executable_and_Linkable_Format
Method of emergency broadcasting in the United States
"beeping" sounds at the start and end of each message. The first signal is the "header" which encodes, among other information, the alert type and locations, or
Emergency_Alert_System
Unit of data on an Ethernet network
packet at the physical layer. Each Ethernet frame starts with an Ethernet header, which contains destination and source MAC addresses as its first two fields
Ethernet_frame
Smallest message entity exchanged using Internet Protocol version 6
information in IPv6 packets is subdivided into a mandatory fixed header and optional extension headers. The payload of an IPv6 packet is typically a datagram or
IPv6_packet
Simple email-validation system designed to detect email spoofing
and for downstream transmission it typically appears in the "Return-Path" header. To authenticate the email address which is actually visible to recipients
Sender_Policy_Framework
This is a list of all airline codes. The table lists the IATA airline designators, the ICAO airline designators and the airline call signs (telephony designator)
List_of_airline_codes
Web application security vulnerability
HTTP header injection is a general class of web application security vulnerability which occurs when Hypertext Transfer Protocol (HTTP) headers are dynamically
HTTP_header_injection
Competitive rodeo team sport
Corriente) and two mounted riders. The first roper is referred to as the "header", the person who ropes the front of the steer, usually around the horns
Team_roping
C/C++ library offered in pure header files
called header-only if the full definitions of all macros, functions and classes comprising the library are visible to the compiler in a header file form
Header-only
System for dealing with email spam
For email uses, a textual encoding of a hashcash stamp is added to the header of an email to prove the sender has expended a modest amount of CPU time
Hashcash
found in the 8-bit Protocol field of the IPv4 header and the 8-bit Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol
List_of_IP_protocol_numbers
Cisco tunneling protocol
directly, use IP protocol type 47 in the IPv4 header's Protocol field or the IPv6 header's Next Header field. For performance reasons, GRE can also be
Generic_routing_encapsulation
Family of archive file formats
the compressed data: The central directory file header entry is an expanded form of the local header: After all the central directory entries comes the
ZIP_(file_format)
Mechanism for automatic trading in digital advertising
Header bidding is a programmatic advertising technique in which publishers bid on multiple advertising exchanges in real time. Google has been reported
Header_bidding
Multipurpose Internet Mail Extensions
application programs. Message bodies may consist of multiple parts, and header information may be specified in non-ASCII character sets. Email messages
MIME
Data used to detect errors in other data
xxHash Error correction Hamming code Reed–Solomon error correction IPv4 header checksum Hash functions List of hash functions Luhn algorithm Parity bit
Checksum
Standard library for the C programming language
interface (API) of the C standard library is declared in a number of header files. Each header file contains one or more function declarations, data type definitions
C_standard_library
Topics referred to by the same term
and Linkable Format § Section Header ISO 10303-21 § HEADER section Value change dump § Header section List of HTTP header fields This disambiguation page
Section_header
Way to traverse IP address spaces without routing
address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device. The
Network_address_translation
Network protocol for data compressiom
Robust Header Compression (ROHC) is a standardized method to compress the IP, UDP, UDP-Lite, RTP, and TCP headers of Internet packets. In streaming applications
Robust_Header_Compression
Software acting on behalf of a user
client–server system. The HTTP User-Agent header is intended to clearly identify the agent to the server. However, this header can be omitted or spoofed, so some
User_agent
Excavation equipment
roadheader, also called a boom-type roadheader, road header machine, road header or just header machine, is a piece of excavating equipment consisting
Roadheader
HTTP header field
The X-Forwarded-For (XFF) HTTP header field is a common method for identifying the originating IP address of a client connecting to a web server through
X-Forwarded-For
Automated message from an email system
Return-Path. The MDA also removes bogus Return-Path header fields inserted by other MTAs; this header field is generally guaranteed to reflect the last
Bounce_message
HTTP status code indicating that access is forbidden to a resource
PROPFIND request but did not also issue the required Depth header or issued a Depth header of infinity. Client request: GET /hello.html HTTP/1.1 Host:
HTTP_403
field is known as the Header Error Control/Check (HEC) field. It consists of the remainder of the division of the 32 bits of the header (taken as the coefficients
CRC-based_framing
Transmission Control Protocol parameter
maximum segment size (MSS) is a parameter of the Options field of the TCP header that specifies the largest amount of data, specified in bytes, that a computer
Maximum_segment_size
English rugby union competition
The London Double Header ran between 2004 and 2017 and typically opened the season of Premiership Rugby (currently known as the Gallagher Premiership due
London_Double_Header
control plane data; header compression; ciphering; integrity protection. The header compression technique can be based on either IP header compression (RFC
Packet Data Convergence Protocol
Packet_Data_Convergence_Protocol
explicitly noted as such. SIP responses may also include an optional Warning header, containing additional details about the response. The Warning contains
List_of_SIP_response_codes
C standard library header providing a set of alternative spellings of common operators
a group of macro constants in the C standard library in the <iso646.h> header. The tokens were created by Bjarne Stroustrup for the pre-standard C++ language
C_alternative_tokens
Structure collecting an engine's exhaust outlets
called a collector. Headers that do not have collectors are called zoomie headers. The most common types of aftermarket headers are made of mild steel
Exhaust_manifold
HTTP header field introduced in HTTP/1.1
The Upgrade header field is an HTTP header field introduced in HTTP/1.1. In the exchange, the client begins by making a cleartext request, which is later
HTTP/1.1_Upgrade_header
Modular translation unit in C++
as a modern alternative to precompiled headers. A module in C++ comprises a single translation unit. Like header files and implementation files, a module
Modules_(C++)
Protocol for delivering audio and video over IP networks
application begins with the RTP packet header. The RTP header has a minimum size of 12 bytes. After the header, optional header extensions may be present. This
Real-time_Transport_Protocol
HeaderDoc is a documentation generator developed and maintained by Apple Inc. Using specially commented source code files as input, HeaderDoc generates
HeaderDoc
Email authentication method designed to associate a domain with a message stream
length h (required), header fields - list of those that have been signed z (optional), header fields - copy of selected header fields and values bh (required)
DomainKeys_Identified_Mail
Architecture term for a layer of the same unit running horizontally in a wall
header is used to bind the two wythes together. Header course: This is a course made up of a row of headers. Bond course: This is a course of headers
Course_(architecture)
Macro guard in C/C++ to block multiple inclusions
programming languages, an #include guard, sometimes called a macro guard, header guard or file guard, is a way to avoid the problem of double inclusion when
Include_guard
14th episode of the 4th season of The Ren & Stimpy Show
"Double Header" is the fourteenth episode of the fourth season of The Ren & Stimpy Show. It originally aired on Nickelodeon in the United States on January
Double_Header
Messaging protocol for web services
message. SOAP header block A SOAP header can contain more than one of these blocks, each being a discrete computational block within the header. In general
SOAP
Version 6 of the Internet Protocol
Authentication Header (AH) and the Encapsulating Security Payload header (ESP) are implemented as IPv6 extension headers. The packet header in IPv6 is simpler
IPv6
Vehicle network technology
responds to the header the rest of the frame slot is silent and the header is ignored. If more than one slave task responds to the header in the same frame
Local_Interconnect_Network
Error checking feature of some header data structures
A header check sequence (HCS) is an error checking feature for various header data structures, such as in the media access control (MAC) header of Ethernet
Header_check_sequence
Communication protocol that allows connections between networks
IP header is different from the modern IPv4 header. IEN 44 Latest Header Formats (June 1978) describes another version of IPv4, also with a header different
Internet_Protocol
System to prevent email fraud
the signature must cover the From field. Within the DKIM-Signature mail header, the d= (domain) and s= (selector) tags specify where in DNS to retrieve
DMARC
Serial interface for testing integrated circuits
Development boards usually include a header to support preferred development tools; in some cases, they include multiple such headers because they need to support
JTAG
Type of wind by direction of travel
A headwind is a wind that blows against the direction of travel of an object, while a tailwind blows in the direction of travel. A headwind decreases the
Headwind_and_tailwind
Communication protocol
scope. For all types of LSAs, there are 20-byte LSA headers. One of the fields of the LSA header is the link-state ID. Each router link is defined as
Link-state_advertisement
File format designed to store three-dimensional data from 3D scanners
and triangle strips. The header of both ASCII and binary files is ASCII text. Only the numerical data that follows the header is different between the
PLY_(file_format)
Special kind of Usenet post used to control news servers
posts by a header field named Control. The body of the field contains control name and arguments. There are two historical alternatives to header field Control
Control_message
IETF working group
participate in the Internet of Things. The 6LoWPAN group defined encapsulation, header compression, neighbor discovery and other mechanisms that allow IPv6 to
6LoWPAN
Ethernet networking standard
multiple-VLAN-header context, out of convenience, the term VLAN tag or just tag for short is often used in place of 802.1Q VLAN header. QinQ allows multiple
IEEE_802.1ad
Network protocol
header follows the 802.2 LLC header if the destination SAP (DSAP) and the source SAP (SSAP) contain hexadecimal values of AA or AB: The SNAP header consists
Subnetwork_Access_Protocol
Software used to access websites
Walter; Rouvoy, Romain (1 April 2021). "Déjà vu: Abusing Browser Cache Headers to Identify and Track Online Users". Proceedings on Privacy Enhancing Technologies
Web_browser
Sharp object of hard metal used as a fastener
is slightly wider than the hole of the nail-header: the smith fits the pin into the hole of the nail-header and then hammers the broad end of the pin.
Nail_(fastener)
Email that contains non-ASCII characters in the header
do not exist in the ASCII character set), encoded as UTF-8, in the email header and in supporting mail transfer protocols. The most significant aspect of
International_email
Website protection mechanism
Policy is communicated by the server to the user agent via an HTTP response header field named Strict-Transport-Security. HSTS Policy specifies a period of
HTTP Strict Transport Security
HTTP_Strict_Transport_Security
GSM SMS metadata
User Data Header (UDH) is a binary structure which may be present at the start of a short message in the Short Message Service in GSM. It does not contain
User_Data_Header
Local cache in a web file
section headers. Explicit section with the header CACHE. Online whitelist section with the header NETWORK. Fallback section with the header FALLBACK
Cache_manifest_in_HTML5
Data item stored in a browser by a website
added a Set-Cookie2 header field, which informally came to be called "RFC 2965-style cookies" as opposed to the original Set-Cookie header field which was
HTTP_cookie
Network protocol
standards, are encoded in ASN.1. GTP' v1 and v2 headers contain the following fields Version The first header field in a GTP' packet is the 3-bit version
GTP'
Extension to the HTTP protocol
alternative to user-agent headers. This was done as part of an initiative by Google called Privacy Sandbox. User-agent headers are code snippets sent by
Client_Hints
Web security vulnerability
Transfer-Encoding header is present, the Content-Length header is supposed to be omitted. Working similarly but with a different syntax, the Content-Length header works
HTTP_request_smuggling
Specialized Internet application protocol
#define COAP_HEADER_TYPE(data) ( (0x30 & (data)[0]) >> 4 ) #define COAP_HEADER_TKL(data) ( (0x0F & (data)[0]) >> 0 ) #define COAP_HEADER_CLASS(data) (
Constrained Application Protocol
Constrained_Application_Protocol
Computer data storage partitioning standard
addressing. The protective MBR is stored at LBA 0, and the GPT header is in LBA 1. The GPT header has a pointer to the partition table (Partition Entry Array)
GUID_Partition_Table
Final of the 2025–26 EFL Cup
Piero Hincapié then missed his shot for Arsenal in the 38th minute with a header from the left side of City's six yard box was too high after a corner kick
2026_EFL_Cup_final
Machine that harvests grain crops
and are fitted with headers up to 60 feet (18 m) wide. Grain headers are commonly referred to as "wheat" headers or draper headers. They are often used
Combine_harvester
Communication protocol for streaming data over the Internet
at any given time. When RTMP data is encoded, a packet header is generated. The packet header specifies, amongst other matters, the ID of the channel
Real-Time_Messaging_Protocol
Computer network protocol
To achieve compatibility, the WebSocket handshake uses the HTTP Upgrade header to change from the HTTP protocol to the WebSocket protocol. The WebSocket
WebSocket
travel, tourism, insurance
HEADER
HEADER
HEADER
HEADER
HEADER
HEADER
HEADER
HEADER
HEADER
travel, tourism, insurance