curl/docs/cmdline-opts/user-agent.md
2026-05-01 10:27:17 +02:00

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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Short: A
Long: user-agent
Arg: <name>
Help: Send User-Agent <name> to server
Protocols: HTTP
Category: important http
Added: 4.5.1
Multi: single
See-also:
- header
- proxy-header
Example:
- -A "Agent 007" $URL
---
# `--user-agent`
Specify the User-Agent string to send to the HTTP server. To encode blanks in
the string, surround the string with single or double quote marks. This header
can also be set with the --header or the --proxy-header options.
If you give an empty argument to --user-agent (""), it removes the header
completely from the request. If you prefer a blank header, you can set it to a
single space (" ").
By default, curl uses curl/VERSION, such as User-Agent: curl/`%VERSION`.