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Information at the beginning of data which describes or defines the data
example C and C++) the functions are declared in header files. Footer Protocol overhead Trailer (computing), used in computer networking Field (computer
Header_(computing)
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
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
Principal protocol used for transmission of datagrams across an IP network
IPv4 addresses. When computing the checksum, again a pseudo header is used that mimics the real IPv6 header: The checksum is computed over the following
User_Datagram_Protocol
Mechanism to detect corruption in the header of an IPv4 packet
complement of the one's complement sum of all 16 bit words in the header. For purposes of computing the checksum, the value of the checksum field is zero. If
Internet_checksum
[RFC 9530, Digest Fields] Content-Digest header enables verification of message content integrity by computing a digest over the literal bytes transmitted
List_of_HTTP_header_fields
Arrangement of information or data, typically in rows and columns
Technologies. Amsterdam: IOS Press. ISBN 1-58603-559-2. see e.g., Page header or Header (computing) The concept of "dimension" is often applied to tables in different
Table_(information)
Secure network protocol suite
In computing, Internet Protocol Security (IPsec) is a secure network protocol suite that authenticates and encrypts packets of data to provide secure
IPsec
Mail sent using electronic means
header. Each email message has a header (the "header section" of the message, according to the specification), comprising a number of fields ("header
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
Principal protocol used to stream data across an IP network
5 bits × 32 bits = 160 bits = 20 bytes. We can compute the TCP length as (Total Length) − (IPv4 Header Length) i.e. 200 − 20, which results in 180 bytes
Transmission_Control_Protocol
Fourth version of the Internet Protocol
Header Checksum: 16 bits The IPv4 header checksum field is used for error checking of the header. Before sending a packet, the checksum is computed as
IPv4
Small form factor PC designed by Intel
Next Unit of Computing (NUC) is a line of small-form-factor barebone computer kits designed by Intel. Previewed in 2012 and launched in early 2013, the
Next_Unit_of_Computing
Executing several computations during overlapping time periods
Concurrent computing is a form of computing in which several computations are executed concurrently—during overlapping time periods—instead of sequentially—with
Concurrent_computing
File format and file archiver program
bytes. The header uses 257 bytes, then is padded with NUL bytes to make it fill a 512 byte record. There is no "magic number" in the header, for file identification
Tar_(computing)
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)
Short length of conductor
In electronics and particularly computing, a jumper is a short length of conductor used to close, open or bypass part of an electronic circuit. They are
Jumper_(computing)
parameters in the header. Chunks may also be fragments of information which are downloaded or managed by P2P programs. In distributed computing, a chunk is
Chunk_(information)
Content of a message excluding headers and metadata
In computing and telecommunications, the payload is the part of transmitted data that is the actual intended message. Headers and metadata are sent only
Payload_(computing)
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
This is a list of computing and IT acronyms, initialisms and abbreviations. 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z See also References
List of computing and IT abbreviations
List_of_computing_and_IT_abbreviations
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
System for dealing with email spam
of work to compute, but the proof can be verified efficiently. For email uses, a textual encoding of a hashcash stamp is added to the header of an email
Hashcash
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
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
C standard library header file
also available in the C++ standard library, though in different headers (the C headers are included as well, but only as a deprecated compatibility feature)
C_mathematical_functions
Communications protocol
same. The use of ETags in the HTTP header is optional (not mandatory as with some other fields of the HTTP 1.1 header). The method by which ETags are generated
HTTP_ETag
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
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
Series of low-cost single-board computers
applications, omitting onboard ports and GPIO headers in favour of a carrier board interface. Compute Modules are offered in one of two formats: a board
Raspberry_Pi
Digital workload distribution techniques
In computing, load balancing is the process of distributing a set of tasks over a set of resources (computing units) with the aim of making their overall
Load_balancing_(computing)
MMLite". Microsoft Invisible Computing. Microsoft. 2004. Retrieved 28 June 2012. "aif_ldr.c". Microsoft Invisible Computing. Microsoft. 2004. Retrieved
Arm_Image_Format
events in the history of computing from 1950 to 1979. For narratives explaining the overall developments, see the history of computing. Information revolution
Timeline of computing 1950–1979
Timeline_of_computing_1950–1979
Device that forwards data packets between computer networks
packet arrives on a line, the router reads the network address in the packet header to determine the ultimate destination. Then, using information in its routing
Router_(computing)
Rewriting an email message sender address
possibility is to store the long rewritten address somewhere in the message header. The i= tag of a DKIM-Signature may be a good place, as such choice considerably
Sender_Rewriting_Scheme
Computer program or file valid in multiple programming languages or file formats
In computing, a polyglot is a computer program or script (or other file) written in a valid form of multiple programming languages or file formats. The
Polyglot_(computing)
Identifier for authenticating with an API
and authorize a user, developer, or calling program to an API. Cloud computing providers such as Google Cloud Platform and Amazon Web Services recommend
API_key
Mechanism to request restricted resources on a web page from another domain
In computing, cross-origin resource sharing (CORS) is a mechanism to safely bypass the same-origin policy; that is, it allows a web page to access restricted
Cross-origin_resource_sharing
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
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
Code that indicates the nature of an error
g. P0123).[citation needed] Abort (computing) Aspect-oriented programming Blue Screen of Death errno.h, a header file in C that defines macros for reporting
Error_code
Collection of resources used to develop a computer program
In computing, a library is a collection of resources that can be used during software development to implement a computer program. Commonly, a library
Library_(computing)
Request method in the HTTP protocol
In computing, POST is a request method supported by HTTP used by the World Wide Web. By design, the POST request method requests that a web server accepts
POST_(HTTP)
Reference model for network communication
defining higher-level protocols. The UK National Computing Centre publication, Why Distributed Computing, which came from considerable research into future
OSI_model
Topics referred to by the same term
Sable, Fable (2025) From, a preposition From (SQL), computing language keyword From: (email message header), field showing the sender of an email FromSoftware
From
Open standard for programming heterogenous computing systems, such as CPUs or GPUs
platform and execute programs on the compute devices. OpenCL provides a standard interface for parallel computing using task- and data-based parallelism
OpenCL
Technique to speed up C/C++ project builds
content of source file B ... in the same project both include the header Header.hpp, that header will be processed twice by the compiler chain, once for each
Unity_build
Time limit of messages in network engineering
Internet Protocol, TTL is an 8-bit field. In the IPv4 header, TTL is the 9th octet of 20. In the IPv6 header, it is the 8th octet of 40. The maximum TTL value
Time_to_live
Cryptographic system with public and private keys
annual ACM symposium on Theory of Computing. STOC '93: ACM Symposium on the Theory of Computing. Association for Computing Machinery. pp. 672–681. doi:10
Public-key_cryptography
Electrical wire connecting circuit components without soldering
Wikimedia Commons has media related to Category:Jumper wires. Jumper (computing) Pin header Jump wire patents What is a 'breadboard' '? Lego Electronic Lab
Jump_wire
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
Number of nonzero symbols in a string
count() method that counts the number of bits that are set. In C++20, a new header <bit> was added, containing functions std::popcount and std::has_single_bit
Hamming_weight
Topics referred to by the same term
AH register, the high byte of an X86 16-bit AX register Authentication Header (AH), a part of the IPsec protocol suite Adenomatous hyperplasia; see endometrial
AH
Execution model which allows for parallel computing
In computing, POSIX Threads, commonly known as pthreads (after its header <pthread.h>), is an execution model that exists independently from a programming
Pthreads
Input/output method in computing
In computing, vectored I/O, also known as scatter/gather I/O, is a method of input and output by which a single procedure call sequentially reads data
Vectored_I/O
needed] For a tutorial and an example of computing the CRC see mathematics of cyclic redundancy checks. The header CRC/HEC is needed for another purpose
CRC-based_framing
Security measure for client-side scripting
In computing, the same-origin policy (SOP) is a concept in the web application security model. Under the policy, a web browser permits scripts contained
Same-origin_policy
The table is presented in alphabetical order by common name. Each column header has an up-down arrow (⬍) that may be used freely to rearrange the order
List of typographical symbols and punctuation marks
List_of_typographical_symbols_and_punctuation_marks
File format
denoted by 1. The simple pixel encoding and the small size of the file header mean that the file size is kept to a minimum, enabling fast transmission
Wireless Application Protocol Bitmap Format
Wireless_Application_Protocol_Bitmap_Format
Programming language construct specifying an identifier's properties
C-family of programming languages, declarations are often collected into header files, which are included in other source files that reference and use these
Declaration (computer programming)
Declaration_(computer_programming)
Supplemental data placed after a block of data being transmitted
the block's end. In data transmission, the data following the end of the header and preceding the start of the trailer is called the payload or body. It
Trailer_(computing)
System for exchanging messages between computing systems
divided into two parts called the header and the payload. The actual message is carried in the payload. The header area contains the fields relevant to
Communication_protocol
Serving multiple documents at the same:;URI
In computing, content negotiation refers to mechanisms defined as a part of HTTP that make it possible to serve different versions of a document (or more
Content_negotiation
Network protocol
messages. These messages exist within the Base Transport Header (BTH), Extended Transport Header, (ETH) and payload, followed by an invariant cyclic redundancy
RDMA_over_Converged_Ethernet
Type of wireless telecommunication network
Digital Resource Networks manage digital resources such as bandwidth, computing power, and cloud storage. Participants can earn rewards by contributing
Decentralized physical infrastructure network
Decentralized_physical_infrastructure_network
CAD software interoperability file format
enable CAD data exchange and interoperability between AutoCAD on different computing platforms. DXF was introduced in December 1982 as part of AutoCAD 1.0
AutoCAD_DXF
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
Computer security standard to prevent cross-site scripting and related attacks
browsers. The following header names are in use as part of experimental CSP implementations: Content-Security-Policy – standard header name proposed by the
Content_Security_Policy
Formatted unit of data carried by a packet-switched network
Ethernet frames. The basis of the packet concept is the postal letter: the header is like the envelope, the payload is the entire content inside the envelope
Network_packet
Numeric value with an unclear meaning
Unix, a header was created to describe the executable image components. Also, a branch instruction was inserted as the first word of the header to skip
Magic_number_(programming)
Tool for speeding up code compilation
tool for speeding up compilation of source code by using distributed computing over a computer network. With the right configuration, distcc can dramatically
Distcc
Concurrency-protecting pointer owned by one thread at most at a time
Hazard pointers, in a multithreaded computing environment, are one approach to solving the problems posed by dynamic memory management of the nodes in
Hazard_pointer
English as lingua franca of programming and computer science
the lingua franca of computing. Computer science utilizes English as its primary conduit. The prevalence of English in computing is a consequence of both
English_in_computing
Lossless data compression
PackBits data stream consists of packets with a one-byte header followed by data. The header is a signed byte; the data can be signed, unsigned, or packed
PackBits
Network event logging system and protocol
In computing, syslog (/ˈsɪslɒɡ/) is a standard for message logging. It allows separation of the software that generates messages, the system that stores
Syslog
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
Information describing a problematic situation
In computing, an error message is a relatively short text message that describes a problematic situation. An error message generally indicates that an
Error_message
format begin with an MZ header (the standard DOS executable header) for backward compatibility with DOS systems. Within the MZ header, at offset 0x3C, there
Linear_Executable
Extreme accumulation of broadcast and multicast traffic on a computer network
rebroadcast broadcast messages and flood the network. Since the layer-2 header does not support a time to live (TTL) value, if a frame is sent into a looped
Broadcast_storm
User-definable variable associated with each running process in many operating systems
equals SET $OFF=\033q. See also the related environment variable %$ON%. %$HEADER% This variable can hold an optional control sequence issued before the output
Environment_variable
Optical disc whose functionality varies depending on the device it is used on
and perhaps time-consuming process on older computing hardware. However, with the advent of faster computing hardware and vastly simplified automated extraction
Hybrid_disc
TCP/IP application layer protocol
A Gemini request consists only of such a URL, terminated by CRLF; the header of a Gemini response consists of a two-digit status code, a space, and a
Gemini_(protocol)
Principal protocol used to assign IPv4 addresses on an IPv4 network
IPv4 Header Offset Octet 0 1 2 3 Octet Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 0 0 IPv4 header start
Dynamic Host Configuration Protocol
Dynamic_Host_Configuration_Protocol
Network protocol used by the Web
and most header fields). Decrease latency to improve page loading speed in web browsers by considering: data compression of HTTP headers HTTP/2 Server
HTTP/2
HDT (Header, Dictionary, Triples) is a data structure and format for serialization which optimizes data compression while still making the media available
HDT_(data_format)
Network that allows computers to share resources and communicate with each other
tunnel between the SSL server and the SSL client. Cloud computing Cyberspace Distributed computing History of the Internet Information Age ISO/IEC 11801 –
Computer_network
Publication of the development and standards for the Internet
the RFC is no longer recommended for use, which differs from "Obsoletes" header in a replacement RFC. For example, RFC 821 (SMTP) itself is obsoleted by
Request_for_Comments
Open-source computing hardware project
Novena is an open-source computing hardware project designed by Andrew "bunnie" Huang and Sean "Xobs" Cross. The initial design of Novena started in 2012
Novena_(computing_platform)
Fictional IPv4 header field indicating malicious intent
The evil bit is a fictional IPv4 packet header field proposed in a humorous April Fools' Day RFC from 2003, authored by Steve Bellovin. The Request for
Evil_bit
Malicious archive file designed to disrupt the program or system reading it
In computing, a zip bomb, also known as a decompression bomb or zip of death (ZOD), is a malicious archive file designed with the goal to crash or freeze
Zip_bomb
Programming language learning environment
store projects. An *.sb file is divided into four sections: "header", this 10-byte header contains the ASCII string "ScratchV02" in versions higher than
Scratch (programming language)
Scratch_(programming_language)
Indexing component of Chinese characters
A radical (Chinese: 部首; pinyin: bùshǒu; lit. 'section header'), or indexing component, is a visually prominent component of a Chinese character under which
Chinese_character_radicals
Computer file format
all 2,352 bytes from each sector in an optical disc, including control headers and error correction data in the case of CD-ROMs (unlike ISO images of
Cue_sheet_(computing)
Administrator of an email server
messages through a filter to remove the e-mail's body, preserving only the headers to diagnose issues Since most domains have a postmaster address, it is
Postmaster_(computing)
Signal to a computer processor emitted by hardware or software
implement computer multitasking and system calls, especially in real-time computing. Systems that use interrupts in these ways are said to be interrupt-driven
Interrupt
Medium capable of storing data in a format readable by a machine
In communications and computing, a machine-readable medium (or computer-readable medium) is a medium capable of storing data in a format easily readable
Machine-readable medium and data
Machine-readable_medium_and_data
System for optimizing the Web
caches: freshness, validation, and invalidation. This is specified in the header of HTTP response messages from the server. Freshness allows a response to
Web_cache
Graphics designing computer by Pixar
the 'Pixar storage standard' PXR File format. PXR file have structure: 1. Header (512 bytes) 2. Tile pointer table (8 × numberTiles bytes) 3. Picture data
Pixar_Image_Computer
Discontinued C IDE and compiler
stripped down spreadsheet called mcalc. This version introduced the <conio.h> header file (which provided fast, PC-specific console I/O routines). Version 2
Turbo_C
Computer diagnostic interface card
In computing, a POST card is a plug-in diagnostic interface card that displays progress and error codes generated during power-on self-test (POST) of
POST_card
HEADER COMPUTING
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HEADER COMPUTING