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annotate mod_compression_unsafe/README.markdown @ 4838:fd2e48d4ac94

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mod_bookmarks2: Advertise XEP-0049 support In the case mod_private isn’t loaded, some clients (like poezio) won’t even attempt to use Private XML Storage unless this feature is advertised. This is on the domain JID and not on the account JID!
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sun, 26 Dec 2021 14:51:35 +0100
parents 4b7e6c01aa1c
children
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1 **NOTE:** XMPP compression has unresolved [security concerns](https://mail.jabber.org/pipermail/standards/2014-October/029215.html),
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2 and this module has been removed from Prosody and renamed.
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3
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4 While the bandwidth usage of XMPP isn't that much, compressing the data
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5 sent to/from your server can give significant benefits to those on slow
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6 connections, such as dial-up or mobile networks. Prosody supports
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7 compression for client-to-server (if your client supports it) and
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8 server-to-server streams using the mod\_compression plugin.
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9
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10 # Details
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11
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12 mod\_compression implements [XEP-0138], and supports the zlib compression
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13 algorithm.
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14
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15 ## Dependencies
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16
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17 The XMPP protocol specifies that all clients and servers supporting
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18 compression must support the "zlib" compression method, and this is what
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19 Prosody uses. However you will need to install zlib support for Lua on
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20 your system. There are different ways of doing this depending on your
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21 system. If in doubt whether it is installed correctly, the command
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22 `lua -lzlib` in a console should open a Lua prompt with no errors.
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23
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24 Debian/Ubuntu
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25 : `apt-get install lua-zlib`
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27 LuaRocks
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28 : `luarocks install lua-zlib`
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30 Source
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31 : <https://github.com/brimworks/lua-zlib>
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32
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33 # Usage
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34
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35 ``` lua
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36 modules_enabled = {
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37 -- Other modules
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38 "compression_unsafe"; -- Enable mod_compression_unsafe
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39 }
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40 ```
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41
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42 ## Configuration
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43
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44 The compression level can be set using the `compression_level` option
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45 which can be a number from 1 to 9. Higher compression levels will use
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46 more resources but less bandwidth.
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47
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48 ## Example
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49
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50 ``` lua
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51 modules_enabled = {
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52 -- Other modules
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53 "compression_unsafe"; -- Enable mod_compression_unsafe
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54 }
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55  
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56 compression_level = 5
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57 ```