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Document devtools influence on HTTP cache headers

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This commits documents the fact that, amongst its property defaults,
devtools is disabling the HTTP cache headers when serving static
resources with Spring MVC.

Fixes gh-7516
This commit is contained in:
Brian Clozel 2016-12-15 17:14:19 +01:00
parent 26643ef428
commit 37605e3576
1 changed files with 6 additions and 3 deletions
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9
spring-boot-docs/src/main/asciidoc/using-spring-boot.adoc
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@ -776,10 +776,13 @@ supported with both the Maven and Gradle plugins.
[[using-boot-devtools-property-defaults]]
=== Property defaults
Several of the libraries supported by Spring Boot use caches to improve performance. For
example, Thymeleaf will cache templates to save repeatedly parsing XML source files.
example, <<spring-boot-features#boot-features-spring-mvc-template-engines,template engines>>
will cache compiled templates to avoid repeatedly parsing template files.
Also, Spring MVC can add HTTP caching headers to responses when serving static resources.
Whilst caching is very beneficial in production, it can be counter productive during
development. If you make a change to a template file in your IDE, you'll likely want to
immediately see the result.
development, preventing you from seeing the changes you just made in your application.
For this reason, spring-boot-devtools will disable those caching options by default.
Cache options are usually configured by settings in your `application.properties` file.
For example, Thymeleaf offers the `spring.thymeleaf.cache` property. Rather than needing