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annotate xml/en/docs/http/ngx_http_split_clients_module.xml @ 617:368a449e85b8

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Expanded documentation of what various parameters of the "listen" directive related to socket options do. While here, documented the fact that accept filters also work on NetBSD.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 02 Aug 2012 13:24:07 +0000
parents 764fbac1b8b4
children 813b8349cdbe
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_http_split_clients_module"
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11 link="/en/docs/http/ngx_http_split_clients_module.html"
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12 lang="en"
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13 rev="1">
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14
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15 <section id="summary">
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16
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17 <para>
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18 The <literal>ngx_http_split_clients_module</literal> module creates
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19 variables suitable for A/B testing, also known as split testing.
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20 </para>
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21
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22 </section>
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23
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24
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25 <section id="example" name="Example Configuration">
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26
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27 <para>
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28 <example>
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29 http {
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30 split_clients "${remote_addr}AAA" $variant {
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31 0.5% .one;
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32 2.0% .two;
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33 * "";
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34 }
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35
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36 server {
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37 location / {
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38 index index${variant}.html;
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39 </example>
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40 </para>
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41
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42 </section>
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45 <section id="directives" name="Directives">
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46
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47 <directive name="split_clients">
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48 <syntax block="yes">
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49 <value>string</value>
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50 <value>$variable</value></syntax>
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51 <default/>
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52 <context>http</context>
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53
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54 <para>
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55 Creates a variable for A/B testing, for example:
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56 <example>
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57 split_clients "${remote_addr}AAA" $variant {
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58 0.5% .one;
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59 2.0% .two;
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60 * "";
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61 }
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62 </example>
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63 The value of the original string is hashed using MurmurHash2.
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64 In the example given, hash values from 0 to 21474835 (0.5%)
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65 correspond to the <var>$variant</var> variable taking the
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66 value <literal>".one"</literal>,
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67 hash values from 21474836 to 107374180 (2%) correspond to
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68 the value <literal>".two"</literal>,
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69 and hash values from 107374181 to 4294967295 correspond to
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70 the value <literal>""</literal>.
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71 </para>
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72
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73 </directive>
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74
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75 </section>
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77 </module>