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Clients in Zulip
zerver.models.Client is Zulip's analogue of the HTTP User-Agent
header (and is populated from User-Agent). It exists for use in
analytics and other places to provide human-readable summary data
about "which Zulip client" was used for an operation (e.g. was it the
Android app, the desktop app, or a bot?).
In general, it shouldn't be used for anything controlling the behavior of Zulip; it's primarily intended to assist debugging.
Analytics
A Client is used to sort messages into client categories such as
ZulipElectron on the /stats
page. For more information see,
Analytics.
Integrations
Generally, integrations in Zulip should declare a unique User-Agent, so that it's easy to figure out which integration is involved when debugging an issue. For incoming webhook integrations, we do that convenentialy via the auth decorators (as we will describe shortly); other integrations generally should set the first User-Agent element on their HTTP requests to something of the form ZulipIntegrationName/1.2 so that they are categorized properly.
The webhook_view auth decorator, used for most incoming
webhooks, accepts the name of the integration as an argument and uses
it to generate a client name that it adds to the request (Django
HttpRequest)
object as request.client.
In most integrations, request.client is then passed to
check_send_stream_message, where it is used to keep track of which client
sent the message (which in turn is used by analytics). For more
information, see the incoming webhook walkthrough.