Web - User Agent (UA)
1 - About
user agent is software (a software agent) that is acting on behalf of a user.
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