How can I find what UserAgent gets attached to my URL requests?

Question

The documentation for HTTPRequest notes that it is possible to indicate a user agent, and that

The default "UserAgent" is typically "Wolfram HTTPClient xxxx", where xxxx is a version number.

How can I find out what this version number is? Ideally this should be done locally and without outgoing network traffic.
I ask because I am writing code to probe an API and I would like to override the default UserAgent in a way that identifies the queries as coming from the package and giving a contact address, but without destroying existing information that could be useful in diagnosing any problems in the future.

Kuba · Accepted Answer

HTTPRequest[""]["Headers"]

{"user-agent" -> "Wolfram HTTPClient 12.3"}

or
HTTPRequest["www.wolfram.com"] // ExportString[#, "HTTPRequest"] &

GET / HTTP/1.1
host: www.wolfram.com
user-agent: Wolfram HTTPClient 12.3

Carl Lange · Answer

If you have the ability to CloudDeploy functions, you can do it like so:
obj = CloudDeploy[APIFunction[{}, $UserAgentString &], 
  Permissions -> "Public"]

Import[First[obj]]

"Wolfram HTTPClient 12.2"

Make sure to clean up after yourself:
DeleteObject[obj]

What we are doing here is deploying an API endpoint that simply returns the User Agent string in the response body, then querying that API and outputting the body (by Importing the First part of obj, which is the URL of our API).
In any case, the expectation would be that the version in the user agent is going to be the version of the Wolfram Language you use.

How can I find what UserAgent gets attached to my URL requests?

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