mod_net_proxy: Use safer util.format for generating description string (thanks tom) It appears that server_event may emit port numbers (src_port() in this case) as strings, rather than integers. This causes string.format() to throw an error. Prosody's util.format is a more forgiving formatter and won't throw an error. The server_event behaviour may be best fixed for the sake of consistency, though.

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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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