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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
Software acting on behalf of a user
like cURL. The user agent is the client in a client–server system. The HTTP User-Agent header is intended to clearly identify the agent to the server.
User_agent
Computer program used to access and manage a user's email
client, email reader, message user agent (MUA), or mail user agent is a computer program used to access and manage a user's email. A web application which
Email_client
Software to transfer electronic mail
Email#Message header for the format of an email message. Many MUAs allow users to see the raw message source directly, thereby allowing header inspection
Message_transfer_agent
Software designed to prevent scraping
application supports inspecting request elements such as headers like the User-Agent header to determine if the request should require proof of work.
Anubis_(software)
the Pragma: no-cache header field has the same purpose. The behavior of no-cache in a response is not specified yet some user agents support it. HTTP/1
List_of_HTTP_header_fields
Extension to the HTTP protocol
privacy-focused 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
Client_Hints
Software used to access websites
this reason, a web browser is often referred to as an HTTP client or a user agent. Requisite materials, including text, style sheets, images, and other
Web_browser
multimedia capabilities and more. This XML data is keyed on the User-Agent: header in a web request. Another approach to the problem is to combine real-time
UAProf
HTTP header field
HTTP header field designed to allow internet users to opt out of tracking by websites, which includes the collection of data regarding a user's activity
Do_Not_Track
Mail sent using electronic means
envelope and content; the content consists of a header and a body. Computer-based messaging between users of the same system became possible after the advent
Access control method for the HTTP network communication protocol
user agent (e.g. a web browser) to provide a user name and password when making a request. In basic HTTP authentication, a request contains a header field
Basic_access_authentication
Security-focused, Android-based mobile operating system
privacy of PSDS on devices using Qualcomm GNSS hardware by removing the User-Agent header containing unique hardware identifiers, such as the serial number
GrapheneOS
Software that extracts images in bulk from websites
referrer and user agent headers sent by the requesting client software to prevent their images from being "fuskered", or require users to log in. However
Fusker
SIP user agent; user agents are divided into clients (UACs), which initiate requests, and servers (UASes), which respond to them. A single user agent may
List_of_SIP_response_codes
Website code to determine a user's browser
used to view the website in a User-Agent header. Extensive browser techniques enable persistent user tracking even if users try to stay anonymous. See device
Browser_sniffing
Malicious website exploit where unauthorized commands are transmitted from a trusted user
of an end user's account. The term "CSRF" is also used as an abbreviation in defences against CSRF attacks, such as techniques that use header data, form
Cross-site_request_forgery
Website protection mechanism
the user agent via an HTTP response header field named Strict-Transport-Security. HSTS Policy specifies a period of time during which the user agent should
HTTP Strict Transport Security
HTTP_Strict_Transport_Security
Application layer protocol
websites, is the server. A web browser is an example of a user agent (UA). Other types of user agent include the indexing software used by search providers
HTTP
Voice-over-IP communications protocol
as smartphones. In SIP, as in HTTP, the user agent may identify itself using a message header field (User-Agent), containing a text description of the
Session_Initiation_Protocol
Data item stored in a browser by a website
field of the HTTP request header, but cookies allow for greater precision. This can be demonstrated as follows: If the user requests a page of the site
HTTP_cookie
A user agent may carry out the additional action with no user interaction if the method used in the additional request is GET or HEAD. A user agent should
List_of_HTTP_status_codes
Rewriting an email message sender address
delivery agent (MDA), putting the mail into the mailbox of the recipient. The MDA transforms the reverse path into the known Return-Path header field: Return-Path:<@news
Sender_Rewriting_Scheme
Automated message from an email system
delivered mail as header field Return-Path inserted by the SMTP mail delivery agent (MDA) (which is usually combined with a mail transfer agent, or MTA). The
Bounce_message
HTTP header field
website address. Some web browsers give their users the option to turn off referrer fields in the request header. Most web browsers do not send the referrer
HTTP_referer
Computer program acting for a user
science, a software agent is a computer program that acts for a user or another program in a relationship of agency. The term agent is derived from the
Software_agent
Defunct mobile browser
Tablet Browser". EFF Deeplinks blog. Retrieved 30 December 2013. User-Agent headers for Nokia devices - Nokia Developer Wiki Archived 2013-02-25 at the
Nokia_Xpress
File indicating parts for web crawling
demonstrating multiple user-agents: User-agent: googlebot # all Google services Disallow: /private/ # disallow this directory User-agent: googlebot-news #
Robots.txt
Serving multiple documents at the same:;URI
ratings of how well it understands them. More precisely, the user agent provides HTTP headers that lists acceptable aspects of the resource and quality factors
Content_negotiation
Simple email-validation system designed to detect email spoofing
field of the mail header, which is actually displayed to the recipient rather than only processed by the recipient's message transfer agent (MTA). SPF (or
Sender_Policy_Framework
it, with three header fields: Accept-Contact to describe the desired destination user agents, Reject-Contact to state the user agents to avoid, and Request-Disposition
SIP extensions for the IP Multimedia Subsystem
SIP_extensions_for_the_IP_Multimedia_Subsystem
Obsolete Internet security mechanism
Transparency. The server communicates the HPKP policy to the user agent via an HTTP response header field named Public-Key-Pins (or Public-Key-Pins-Report-Only
HTTP_Public_Key_Pinning
submission agent (MSA) or mail submission agent is a computer program or software agent that receives electronic mail messages from a mail user agent (MUA)
Message_submission_agent
Multipurpose Internet Mail Extensions
used by the reader's mail user agent to store the attachment. The following example is taken from RFC 2183, where the header field is defined: Content-Disposition:
MIME
Internet protocol used for relaying e-mails
transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients typically use SMTP only for
Simple_Mail_Transfer_Protocol
Computer security standard to prevent cross-site scripting and related attacks
Note: User agents may allow users to modify or bypass policy enforcement through user preferences, bookmarklets, third-party additions to the user agent, and
Content_Security_Policy
Mobile version of the Internet Explorer web browser by Microsoft
shipped with a browser that identified itself as "IEMobile 6.12" in the User-Agent header "Internet Explorer Mobile 6". Microsoft Learn Archive. 2008-11-11
Internet_Explorer_Mobile
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
Proposed web cryptography standard
resource, the user agent should send the JWT, typically in the Authorization HTTP header using the Bearer schema. The content of the header might look like
JSON_Web_Token
Computer software that delivers email to a mailbox
message delivery agents with the message transfer agent component, providing for site customization of the specifics of mail delivery to a user. On Unix-like
Message_delivery_agent
Method of instructing a browser to automatically refresh a web page
lead to user dissatisfaction or raise concerns about security. Meta refresh uses the http-equiv meta tag to emulate the Refresh HTTP header, and as such
Meta_refresh
Email authentication method designed to associate a domain with a message stream
canonicalization algorithm(s) for header and body q (optional), default query method i (optional), Agent or User Identifier (AUID) t (recommended), signature
DomainKeys_Identified_Mail
Techniques aimed at providing verifiable information about the origin of email messages
delivery of a message, it inserts this field at the top of the header. A mail user agent (MUA) knows the outgoing mail SMTP server from its configuration
Email_authentication
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
Tool used to overcome the lack of IPv4 address availability
In case a user agent is located behind a NAT then it will use a private IP address as its contact address in the contact and via headers as well as the
NAT traversal with session border controllers
NAT_traversal_with_session_border_controllers
Computer network management and monitoring protocol
protocol suite. All SNMP messages are transported via User Datagram Protocol (UDP). The SNMP agent receives requests on UDP port 161. The manager may send
Simple Network Management Protocol
Simple_Network_Management_Protocol
System to prevent email fraud
DMARC reject using the Sender field on the non-technical basis that many user agents do not display this to the recipient. A draft DMARC specification has
DMARC
HTML Metadata
response headers, but no web servers currently implement this behavior. Instead, the user agent emulates the behavior for some HTTP headers as if they
Meta_element
System for dealing with email spam
implement in mail user agents and spam filters. No central server is needed. Hashcash can be incrementally deployed—the extra Hashcash header is ignored when
Hashcash
Technique used by websites to prevent loading in frames
useless: The user agent does not support JavaScript. The user agent supports JavaScript but the user has turned support off. The user agent's JavaScript
Framekiller
HTML element
user is not expected to need the audio stream, or that minimizing unnecessary traffic is desirable. "metadata": Hints to the User-Agent that the user
HTML_audio
Artificial intelligence tool
May 2025, GitHub announced "coding agent", which is a more autonomous mode of operation for the Copilot. The user would assign a task or issue to Copilot
GitHub_Copilot
Format for expressing RDF statements in HTML documents
RDFa also enables the extraction of RDF model triples by compliant user agents. The RDFa community runs a wiki website to host tools, examples, and
RDFa
Method of exchanging digital messages
clients Email hosting service Internet mail standards Mail transfer agent Mail user agent Unicode and email Webmail Anonymous remailer Disposable email address
IMail
Cyberattack allowing one to know another's session identifier
for others it does not. Browsers identify themselves by "User-Agent" HTTP headers. This header does not normally change during use; it would be extremely
Session_fixation
Network admission control system
machine's operating system: By default, the system uses the User-Agent string from the HTTP header to determine the client OS. Release 3.6.0 provides additional
Cisco_NAC_Appliance
Individual component of an HTML document
current. <th>...</th> A <table> header cell; contents are conventionally displayed bold and centered. An aural user agent may use a louder voice for these
HTML_element
Search engine optimization technique
presented to the user's browser. This is done by delivering content based on the IP addresses or the User-Agent HTTP header of the user requesting the page
Cloaking
Technique for making a Web page available under more than one URL address
submissions if the user clicks the refresh button after submitting the form, creating a more intuitive interface for user agents (users). Redirects can be
URL_redirection
Identifier of the destination where email messages are delivered
Protocol (IMAP). When transmitting email messages, mail user agents (MUAs) and mail transfer agents (MTAs) use the domain name system (DNS) to look up a
Email_address
Mechanism by which a mail server sends the emails of one of its users to another address
message are carried out, so as to rather resemble the action of a Mail User Agent submitting a new message, the term forwarding becomes deceptive and remailing
Email_forwarding
Internet Engineering Task Force standard communications protocol
home agent, the home agent redirects these packets towards the remote address through an IP tunnel by encapsulating the datagram with a new IP header using
Mobile_IP
Former brand name for Microsoft online services
according to the time of day and the current weather conditions of the user. The default header theme is a bright sky blue that fades to white downwards, with
Windows_Live
Subject, Date, etc.) many news readers allow users to add optional fields to a header. Adding a header field of X-No-Archive: yes or Archive: no signals
X-No-Archive
Platform for website privacy preferences
management Privacy policy Do Not Track, a formerly official HTTP header allowing users to opt out of tracking Global Privacy Control "The Platform for
P3P
Failed anti-spoofing proposal
based on Resent-* header fields that are often not displayed to the user. To be an effective anti-phishing tool, the MUA (Mail User Agent or Mail Client)
Sender_ID
Internet ecosystem layer that addresses bottlenecks
requesting browser and/or device through analysis of the User-Agent string, HTTP Accept headers, Client-Hints or JavaScript. The following table summarizes
Content_delivery_network
Network device deployed in VoIP networks
between the user agents the proxy’s task is to identify the callee’s location and forward the request to it. The proxy also adds a Via header with its own
Session_border_controller
Library for JavaScript
communication features using audio and video. It makes it possible to build SIP user agents that send and receive audio and video calls as well as and text messages
JsSIP
Email address to which bounce messages are delivered
information, while "2822-From:" refers to the address in the "From:" header seen by end users. Used in RFC 5598. 5321-FROM - Evolution of 2821-FROM as from October
Bounce_address
HTTP extension supporting TLS encryption
the request's URL, query parameters, headers, and cookies (which often contain identifying information about the user). However, because website addresses
HTTPS
Grouping of related messages in digital communications
the Message-ID: header field of each message, e.g. Message-ID: <xNCx2XP2qgUc9Qd2uR99iHsiAaJfVoqj91ocj3tdWT@wikimedia.org> If a user creates message B
Thread_(online_communication)
Computer system that receives and forwards requests
can be beneficial for some users as it hides the originating IP address. Forwarding headers: Some proxies append HTTP headers to disclose client or proxy
Proxy_server
Interface between Web servers and external programs
receives the output from the CGI program and transmits it to the user agent. Then if the user agent clicks the "Edit page" button, the CGI program populates an
Common_Gateway_Interface
Method of identifying remote computing devices via hardware and software configuration
access user information prior to their deprecation. User agents may provide system hardware information, such as phone model, in the HTTP header. Properties
Device_fingerprint
field in the signed header. The sender may also use the Sender Policy Framework to authenticate its domain name. The VBR-Info: header field contains the
Vouch_by_Reference
Computer networking protocol
although the lack of PPPoE switches making routing decisions based on PPPoE headers limits applicability in that respect. In late 1998, the DSL service model
Point-to-Point Protocol over Ethernet
Point-to-Point_Protocol_over_Ethernet
Computer markup language
begins with a request directed at the IdP. The principal (via an HTTP user agent) requests the Inter-site Transfer Service at the identity provider: https://idp
SAML_1.1
takes into account the profile (IP address, User-Agent HTTP header, time of access, and so on) of the agent requesting access to the system to determine
Risk-based_authentication
Computer network protocol
ignored by the Diameter agent. In case of redirecting agents, the Hop-by-Hop Identifier is maintained in the header as the Diameter agent responds with an answer
Diameter_(protocol)
HTTP cookies used principally for web tracking
browsing history of the user across all the websites that have ads from this advertiser, through the use of the HTTP referer header field. As of 2014[update]
Third-party_cookies
Furry-themed imageboard art website
currently used on the navigation bar in the header by default since June 2025. A themes page (e926 link) allows users to change the logo to one of several variants
E621_(website)
Uniform address for services on a website
metadata that any user agent (e.g., web browser) can request. The metadata is useful for various tasks, including directing a web user to use a mobile app
Well-known_URI
Tool for speeding up code compilation
participating machines. The originating machine invokes a preprocessor to handle header files, preprocessing directives (such as #ifdef) and the source files and
Distcc
Programming language learning environment
children as an educational tool, with a target audience of ages 5 to 16. Users can create projects on the website using a block-like interface. Scratch
Scratch (programming language)
Scratch_(programming_language)
Internet protocol for HTTP payments
renewals: Autonomous execution of recurring payments by software agents on behalf of users. A simple Node.js example using x402 middleware: app.use( paymentMiddleware(
X402
Website content based on a visitor's location
delivery is different from cloaking via "user agent". While IP address spoofing is harder and more reliable than user-agent spoofing, it is also harder to keep
Geotargeting
Notification of email message status
the e-mail header, with the email return address specified. The first time a user opens an email message containing this field in the header, the client
Return_receipt
Computer software that distributes web pages
protocol created to distribute web content) or its secure variant HTTPS. A user agent, commonly a web browser or web crawler, initiates communication by making
Web_server
Type of web vulnerability
through a directory traversal attack. An attacker can modify a HTTP header (such as User-Agent) in this attack to be PHP code to exploit remote code execution
File_inclusion_vulnerability
video and audio streaming. NZB downloader – binary grabber client without header support – cannot browse groups or read/post text messages; can only load
List_of_Usenet_newsreaders
Text-based user interface API
open-source software portal conio.h – A C header file used mostly with MS-DOS compilers to create text user interfaces Curses Development Kit Dialog (software)
Ncurses
Input fields on a Web page
page allows a user to enter data that is sent to a server for processing. Forms can resemble paper or database forms because web users fill out the forms
HTML_form
Programming language
documents refer to this as running in the cloud. User-facing programs would consist of a number of such agents, which might run locally, on the provider's
Telescript (programming language)
Telescript_(programming_language)
Open-source e-mail spam filter
headers and can be used in post-processing for less severe actions, such as tagging the mail as suspicious. Apache SpamAssassin allows for a per-user
Apache_SpamAssassin
Computer networking protocol
the endpoint (16 bytes) and the signature is an SHA1 hash (20 bytes). The header has a total of 8 + 16 + 20 = 44 bytes. Encapsulated in UDP and IPv4, the
Anything_In_Anything
Style sheet language
lower priority, such as the user agent style. The process is called cascading. One of the goals of CSS is to allow users greater control over presentation
CSS
Suite of computer programs and protocols
be used to send email between machines, with suitable mail user interfaces and delivery agent programs. A simple UUCP mail address was formed from the adjacent
UUCP
Procedures examining network data
multiple headers for IP packets; network equipment only needs to use the first of these (the IP header) for normal operation, but use of the second header (such
Deep_packet_inspection
forms the primary information contained in an ETV Application. An ETV User Agent acquires, decodes, presents (widgets), and executes (actions) contained
Enhanced TV Binary Interchange Format
Enhanced_TV_Binary_Interchange_Format
USER AGENT-HEADER
USER AGENT-HEADER
Surname or Lastname
English
English : from Old French argent ‘silver’, hence probably a nickname for someone with silver-gray hair, or possibly an occupational nickname for a silversmith or moneyer.
Female
Egyptian
, the Hidden.
Male
Yiddish
Variant spelling of Yiddish Isser, ISER means "God prevails" or "contender; soldier of God."
Female
Egyptian
, the wife of Uer-mu.
Surname or Lastname
English
English : variant of Essary. Compare Ussery.
Surname or Lastname
English, Scottish, and Irish
English, Scottish, and Irish : occupational name for a janitor or gatekeeper, Middle English usher (Anglo-Norman French usser, Old French ussier, huissier, from Late Latin ustiarius, a derivative of classical Latin ostium ‘door’, ‘gate’). The term was also used in the Middle Ages of a court official charged with accompanying a person of rank on ceremonial occasions, and this may be a partial souce of the surname. This surname has been recorded in Ireland since the 14th century, and has sometimes been used as an equivalent of Hession.Jewish (from Poland and Ukraine) : from a southern Yiddish pronunciation of the Yiddish male personal name Osher (Hebrew Asher).Hezekiah Usher (d. 1676) is buried in King’s Chapel Burying Ground, Boston, MA.
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : probably from a reduced form of the Anglo-Norman French personal name or nickname Avenant ‘suitable’ or ‘handsome’.Family historians record an Isham Avent in the Carolinas in the 1760s. His father was Colonel Thomas Avent from England.
Boy/Male
Australian, Danish, Dutch, German, Swedish
Eagle Ruler
Surname or Lastname
English
English : from an Old French personal name Amand, Amant (from Latin Amandus meaning ‘loveable’).German : variant spelling of Amend.
Girl/Female
Muslim
Agent
Girl/Female
British, English
A Beautiful Girl
Male
Turkish
Turkish unisex name ESER means "achievement."
Boy/Male
Muslim
Life name of the second caliph
Female
Egyptian
, the wife of Ra-er, and mother of Uer-mu.
Boy/Male
French
Born during Advent.
Boy/Male
African, Arabic, Australian, Muslim
Life; Name of the Second Caliph
Female
Egyptian
, the daughter of Merenpthah I.
Surname or Lastname
English and French
English and French : nickname, possibly sometimes applied ironically, from Middle English gente, Old French gent(il) ‘well born’, ‘noble’, ‘courteous’. Compare Gentle.German and English : habitational name for someone from Ghent in Flanders, French name Gand.
Boy/Male
Christian, Hindu, Indian
Gentleman
Female
Egyptian
, the sister of the royal scribe User-hat.
USER AGENT-HEADER
USER AGENT-HEADER
USER AGENT-HEADER
USER AGENT-HEADER
USER AGENT-HEADER
USER AGENT-HEADER
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