Web - User Agent (UA)
Table of Contents
1 - About
A user agent is software (a software agent) that is acting on behalf of a user.
The most well-known user agent is a web browser but it can also be a bot
A user agent may:
- display a document,
- read it aloud,
- cause it to be printed,
- convert it to another format, etc.
When software agent operates in a network protocol, it often identifies itself, its application type, operating system, software vendor, or software revision, by submitting a characteristic identification string to its operating peer. In HTTP, SIP, and SMTP/NNTP protocols, this identification is transmitted in a header field User-Agent
2 - Articles Related
3 - String
The user agent string is a a string that represents the identifier of a user-agent.
It's send by the browsers with the User-Agent HTTP headers.