Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_slice_module.xml @ 2699:8b96520ca495
Linux packages: clarified supported SLES versions
author | Konstantin Pavlov <thresh@nginx.com> |
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date | Tue, 30 Mar 2021 19:37:13 +0300 |
parents | 6299f9cabfe4 |
children | 4add6ae1296f |
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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) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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8 |
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9 <module name="Module ngx_http_slice_module" |
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10 link="/en/docs/http/ngx_http_slice_module.html" |
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11 lang="en" |
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12 rev="3"> |
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13 |
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14 <section id="summary"> |
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15 |
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16 <para> |
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17 The <literal>ngx_http_slice_module</literal> module (1.9.8) is a filter |
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18 that splits a request into subrequests, |
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19 each returning a certain range of response. |
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20 The filter provides more effective caching of big responses. |
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21 </para> |
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22 |
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23 <para> |
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24 This module is not built by default, it should be enabled with the |
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25 <literal>--with-http_slice_module</literal> |
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26 configuration parameter. |
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27 </para> |
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28 |
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29 </section> |
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30 |
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31 |
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32 <section id="example" name="Example Configuration"> |
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33 |
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34 <para> |
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35 <example> |
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36 location / { |
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37 <emphasis>slice</emphasis> 1m; |
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38 proxy_cache cache; |
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39 proxy_cache_key $uri$is_args$args<emphasis>$slice_range</emphasis>; |
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40 proxy_set_header Range <emphasis>$slice_range</emphasis>; |
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41 proxy_cache_valid 200 206 1h; |
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42 proxy_pass http://localhost:8000; |
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43 } |
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44 </example> |
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45 In this example, |
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46 the response is split into 1-megabyte cacheable slices. |
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47 </para> |
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48 |
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49 </section> |
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50 |
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51 |
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52 <section id="directives" name="Directives"> |
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53 |
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54 |
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55 <directive name="slice"> |
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56 <syntax><value>size</value></syntax> |
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57 <default>0</default> |
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58 <context>http</context> |
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59 <context>server</context> |
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60 <context>location</context> |
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61 |
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62 <para> |
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63 Sets the <value>size</value> of the slice. |
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64 The zero value disables splitting responses into slices. |
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65 Note that a too low value may result in excessive memory usage |
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66 and opening a large number of files. |
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67 </para> |
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68 |
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69 <para> |
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70 In order for a subrequest to return the required range, |
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71 the <var>$slice_range</var> variable should be |
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72 <link doc="ngx_http_proxy_module.xml" id="proxy_set_header">passed</link> to |
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73 the proxied server as the <literal>Range</literal> request header field. |
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74 If |
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75 <link doc="ngx_http_proxy_module.xml" id="proxy_cache">caching</link> |
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76 is enabled, <var>$slice_range</var> should be added to the |
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77 <link doc="ngx_http_proxy_module.xml" id="proxy_cache_key">cache key</link> |
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78 and caching of responses with 206 status code should be |
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79 <link doc="ngx_http_proxy_module.xml" id="proxy_cache_valid">enabled</link>. |
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80 </para> |
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81 |
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82 </directive> |
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83 |
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84 </section> |
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85 |
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86 |
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87 <section id="variables" name="Embedded Variables"> |
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88 |
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89 <para> |
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90 The <literal>ngx_http_slice_module</literal> module |
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91 supports the following embedded variables: |
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92 <list type="tag"> |
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93 |
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94 <tag-name id="var_slice_range"><var>$slice_range</var></tag-name> |
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95 <tag-desc> |
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96 the current slice range in |
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97 <link url="https://tools.ietf.org/html/rfc7233#section-2.1">HTTP |
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98 byte range</link> format, |
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99 for example, <literal>bytes=0-1048575</literal>. |
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100 |
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101 </tag-desc> |
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102 |
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103 </list> |
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104 </para> |
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105 |
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106 </section> |
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107 |
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108 </module> |