mod_vcard_muc: Add an alternative method of signaling avatar change When the avatar has been changed, a signal is sent that the room configuration has changed. Clients then do a disco#info query to find the SHA-1 of the new avatar. They can then fetch it as before, or not if they have it cached already. This is meant to be less disruptive than signaling via presence, which caused problems for some clients. If clients transition to the new method, the old one can eventually be removed. The namespace is made up while waiting for standardization. Otherwise it is very close to what's described in https://xmpp.org/extensions/inbox/muc-avatars.html

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summary: HTTP request logging
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Introduction
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This module logs *outgoing* requests that go via the internal net.http API.

Output format liable to change.

Configuration
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One option is required, set `log_http_file` to the file path you would like to log to.

Compatibility
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  0.10   Works (requires 375cf924fce1 or later)
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