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Chapter 5. Configuring Contexts
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## Chapter 5. Configuring Contexts

This chapter discusses various options for configuring Jetty contexts.

## Setting a Context Path

The context path is the prefix of a URL path that is used to select the context(s) to which an incoming request is passed. Typically a URL in a Java servlet server is of the format `http://hostname.com/contextPath/servletPath/pathInfo`, where each of the path elements can be zero or more / separated elements. If there is no context path, the context is referred to as the root context. The root context must be configured as `/` but is reported as the empty string by the servlet API `getContextPath()` method.

How you set the context path depends on how you deploy the web application (or `ContextHandler`).

### Using Embedded Deployment

If you run Jetty from code as an embedded server (see Embedding), setting the context path is a matter of calling the `setContextPath` method on the `ContextHandler` instance (or `WebAppContext` instance).

### By naming convention

If a web application is deployed using the WebAppProvider of the DeploymentManager without an XML IoC file, then the name of the WAR file is used to set the context path:

- If the WAR file is named myapp.war, then the context will be deployed with a context path of `/myapp`
- If the WAR file is named ROOT.WAR (or any case insensitive variation), then the context will be deployed with a context path of `/`
- If the WAR file is named ROOT-foobar.war ( or any case insensitive variation), then the context will be deployed with a context path of `/` and a virtual host of "foobar"

### By Deployer configuration

If a web application is deployed using the `WebAppProvider` of the `DeploymentManager` with an XML IoC file to configure the context, then the `setContextPath` method can be called within that file. For example:

    <Configure class="org.eclipse.jetty.webapp.WebAppContext">
      <Set name="contextPath">/test</Set>
      ...
    </Configure>

### Embedding a WEB-INF/jetty-web.xml File

You can also set the context path for webapps by embedding a `WEB-INF/jetty-web.xml` file in the WAR, which uses the same XML IoC format as the deployer example above. However this is not the preferred method as it requires the web application to be modified.

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