Check account exists

How i can check if account exists ?

i tried send this stanza to search account:

<iq type="get" xmlns="jabber:client" id="e484ad16-0ecf-4253-a1d0-c64de4238aae:sendIQ">
<query xmlns="jabber:iq:search"/>

and get response error:

<iq xmlns="jabber:client" to="juju@" from="juju@" type="error" id="52827ab6-ddbc-40c2-90a2-bcc88af68eab:sendIQ">
<query xmlns="jabber:iq:search"/>
<error code="503" type="cancel">
<service-unavailable xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/>
<text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas">No module is handling this query</text>

how can solve this ? or how can check account exists ?

If the server has mod_vcard

If the server has mod_vcard enabled, with the option search: true, and the account published his vCard, then you can search for it:

<iq id='37:561031' type='set' to='vjud.localhost'>
  <query xmlns='jabber:iq:search'>
    <x type='submit' xmlns='jabber:x:data'>
      <field var='user'>

mod_vcard is disabled.

mod_vcard is disabled.

to search account needs

to search account needs v_card enabled ?

Account existence is

Account existence is considered a private information, so in Jabber/XMPP it is NOT revealed if an account exists or not.

There is an alternative, a trick: enable mod_vcard, enable search, and tell users to publish their vcard; then it is possible to search for those vcards.

search belongs to a v_card or

search belongs to a v_card or is an separaed feature ?

search in vcard requires

search in vcard requires mod_vcard enabled, and requires that the user publishes his vcard

how i can do user publish his

how i can do user publish his vcard on create account?

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