Version: 9.4.20.v20190813 |

Chapter 18. Provided Servlets, Filters, and Handlers
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## Chapter 18. Provided Servlets, Filters, and Handlers

Jetty ships with a bundle of servlets that interact with the key classes. Most are in the org.eclipse.jetty.servlets package. These servlets and filters are among the principle elements of Jetty as a component-based infrastructure that holds and runs J2EE applications. As described, they play a major role in running and maintaining the Jetty server.

Also included are a number of Jetty specific handlers that allow access to internals of jetty that would not normally be exposed and are very useful testing environments and many production scenarios.

## Default Servlet

### Info

- Classname: `org.eclipse.jetty.servlet.DefaultServlet`
- Maven Artifact: org.eclipse.jetty:jetty-servlet
- Javadoc: http://www.eclipse.org/jetty/javadoc/9.4.20.v20190813/org/eclipse/jetty/servlet/DefaultServlet.html

### Usage

The `DefaultServlet` implements the `ResourceFactory` interface and extends the `HttpServlet` abstract class. It is usually mapped to "/" and provides handling for static content, `OPTION` and `TRACE` methods for the context. The `MOVE` method is allowed if `PUT` and `DELETE` are allowed. See the `DefaultServlet` javadoc.

### Init Parameters

Jetty supports the following `initParameters`:

acceptRanges
  If `true`, range requests and responses are supported.
dirAllowed
  If `true`, directory listings are returned if no welcome file is found. Otherwise 403 Forbidden displays.
redirectWelcome
  If `true`, welcome files are redirected rather that forwarded.
welcomeServlets
  If `true`, attempt to dispatch to welcome files that are servlets, but only after no matching static resources could be found. If `false`, then a welcome file must exist on disk. If `exact`, then exact servlet matches are supported without an existing file. Default is `true`. This must be `false` if you want directory listings, but have index.jsp in your welcome file list.
precompressed
  If set to a comma separated list of encoding types (that may be listed in a requests Accept-Encoding header) to file extension mappings to look for and serve. For example: `br=.br,gzip=.gz,bzip2=.bz`. If set to a boolean `true`, then a default set of compressed formats will be used, otherwise no precompressed formats supported.
gzip
  Deprecated. Use `precompressed` instead. If set to `true`, then static content is served as gzip content encoded if a matching resource is found ending with ".gz".
resourceBase
  Set to replace the context resource base.
resourceCache
  If set, this is a context attribute name, which the servlet will use to look for a shared ResourceCache instance.
relativeResourceBase
  Set with a pathname relative to the base of the servlet context root. Useful for only serving static content out of only specific subdirectories.
cacheControl
  If set, all static content will have this value set as the cache-control header.
pathInfoOnly
  If `true`, only the path info will be applied to the resourceBase
stylesheet
  Set with the location of an optional stylesheet that will be used to decorate the directory listing html.
etags
  If `true`, weak etags will be generated and handled.
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.
useFileMappedBuffer
  If set to `true`, mapped file buffer serves static content. Setting this value to `false` means that a direct buffer is used instead of a mapped file buffer. By default, this is set to `true`.
otherGzipFileExtensions
  A comma separated list of other file extensions that signify that a file is gzip compressed. If you don’t explicitly set this, it defaults to `.svgz`.
encodingHeaderCacheSize
  Max entries in a cache of ACCEPT-ENCODING headers

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