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annotate xml/en/docs/faq/variables_in_config.xml @ 196:aafe530e7d6f

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- Added faq/ and more q&a as previously agreed
author Andrey Alexeev <andrew@nginx.com>
date Wed, 23 Nov 2011 15:32:04 +0000
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1 <!DOCTYPE article SYSTEM "../../../dtd/article.dtd">
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2
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3 <article name="Is there a proper way to use nginx variables to
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4 make sections of the configuration shorter,
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5 using them as macros for making
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6 parts of configuration work as templates?"
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7 link="/en/docs/faq/variables_in_config.html"
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8 lang="en">
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9
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10 <section>
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11
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12 <para>
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13 <initial>Q:</initial>
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14 Is there a proper way to use nginx variables to make sections of
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15 the configuration shorter, using them as macros for making
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16 parts of configuration work as templates?
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17 </para>
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18
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19 <para>
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20 &nbsp;
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21 </para>
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22
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23 <para>
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24 <initial>A:</initial>
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25 Variables should not be used as template macros. Variables are
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26 evaluated in the run-time during the processing of each
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27 request, so they are rather costly compared to plain static
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28 configuration. Using variables to store static strings is also
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29 a bad idea. Instead, a macro expansion should be used to
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30 generate configs more easily and it can be done with the
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31 external tools, e.g. sed + make or any other common template
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32 mechanism.
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33 </para>
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34
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35 </section>
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36
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37 </article>