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WalkerWatch 2017-07-26 12:05:25 -04:00
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jetty-documentation/src/main/asciidoc/reference/jetty-xml/webdefault-xml.adoc
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=== webdefault.xml
The `webdefault.xml` file saves web applications from having to define a lot of house-keeping and container-specific elements in their own `web.xml` files.
For example, you can use it to set up mime-type mappings and JSP servlet-mappings.
Jetty applies `webdefault.xml` to a web application _before_ the application's own `WEB-INF/web.xml`, which means that it cannot override values inside the webapp's `web.xml`.
For example, you can use it to set up MIME-type mappings and JSP servlet-mappings.
Jetty applies `webdefault.xml` to a web application _before_ the application's own `WEB-INF/web.xml`, which means that it *cannot* override values inside the webapp's `web.xml`.
It uses the xref:jetty-xml-config[] syntax.
Generally, it is convenient for all webapps in a Jetty instance to share the same `webdefault.xml` file.
However, it is certainly possible to provide differentiated ` webdefault.xml` files for individual web applications.
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To ensure your `webdefault.xml` files are validated, you will need to set the `validateXml` attribute to true as described link:#jetty-xml-dtd[here.]
____
The `webdefault.xml` link:{GITBROWSURL}/jetty-webapp/src/main/config/etc/webdefault.xml[included with the Jetty Distribution] contains several configuration options, such as init params and servlet mappings, and is separated into sections for easy navigation.
Some of the more common options include, but are not limited to:
dirAllowed::
If true, directory listings are returned if no welcome file is found.
Otherwise 403 Forbidden displays.
precompressed::
If set to a comma separated list of file extensions, these indicate compressed formats that are known to map to a MIME-type that may be listed in a requests Accept-Encoding header.
If set to a boolean True, then a default set of compressed formats will be used, otherwise no pre-compressed formats.
maxCacheSize::
Maximum total size of the cache or 0 for no cache.
maxCachedFileSize::
Maximum size of a file to cache.
maxCachedFiles::
Maximum number of files to cache.
[[creating-custom-webdefault-xml-one-webapp]]
===== Creating a Custom webdefault.xml for One WebApp