Table of Contents
As listed in the Contents above, Jetty provides several types of connectors that allow you to tailor the server setup to suit your circumstances.
This connector uses efficient NIO buffers with a non-blocking threading model. Jetty uses Direct NIO buffers, and allocates threads only to connections with requests. Synchronization simulates blocking for the servlet API, and any unflushed content at the end of request handling is written asynchronously. See the javadoc. This connector is best used when there are a many connections that have idle periods.
When used with [[Jetty/Feature/Continuations|Continuations]], //TODO xref// threadless waits are supported.
When a filter or servlet calls getEvent
on a Continuation, a runtime exception is thrown to allow the
thread to exit the current request handling. Jetty catches this exception and does not send a response to the
client. Instead Jetty releases the thread and places the Continuation on the timer queue. If the Continuation
timeout expires, or its resume method is called, then Jetty again allocates a thread to the request, and the
request retries. The limitation of this approach is that request content is not available on the retried request,
thus if possible it should be read after the Continuation or saved as a request attribute or as the associated
object of the Continuation instance.
This connector implements a traditional blocking IO and threading model. Jetty uses Normal JRE sockets and allocates a thread per connection. Jetty allocates large buffers to active connections only. You should use this Connector only if NIO is not available. See the javadoc.
This is an SSL connector that uses NIO. For more information about its configuration, see [[Jetty/Reference/SSL Connectors|SSL Connector Reference]]. //TODO xref//See also the javadoc.
This is a blocking IO connector that supports SSL. See the javadoc.
This connector implements the AJP13 protocol. See [[Jetty/Howto/Configure AJP13|How to Configure Ajp13]] //TODO xref//for more information, and also take a look at [[JETTY/Howto/Configure mod_proxy|How to Configure mod_proxy]] //TODOxref// for alternatives to using the AJP13 protocol. See also the javadoc.
You can fine tune your connector configuration using the following parameters.
Table 3. Connector Configuration Parameters
Parameter | Description |
---|---|
acceptors | The number of threads dedicated to accepting incoming connections. |
acceptQueueSize | Number of connection requests that can be queued up before the operating system starts to send rejections. |
acceptorPriority | Sets the priority of the acceptor threads relative to the other threads. |
confidentialPort | The port to redirect to if there is a security constraint of CONFIDENTIAL. |
confidentialScheme | https by default |
forwarded | If true use <tt>hostHeader</tt>or else check the headers for retrieving information from the original request to control what <tt>ServletRequest#getServerName()</tt>and <tt>ServletRequest#getServerPort()</tt>and <tt>ServletRequest#getRemoteAddr()</tt>return. Default is false. See [[Jetty/Howto/Configure mod_proxy|How to Configure mod_proxy]]. |
forwardedHostHeader | The forwarded <tt>Host</tt>header to use. Default is <tt>X-Forwarded-Host</tt>. This value is used only if <tt>forwarded</tt>is true. |
forwardedServerHeader | The forwarded server name header to use. Default is <tt>X-Forwarded-Server</tt>. This value is used only if <tt>forwarded</tt>is true. |
forwardedForHeader | The forwarded for header to use. Default is <tt>X-Forwarded-For</tt>. This value is used only if <tt>forwarded</tt>is true. |
headerBufferSize | Sets the size of the buffer for request and response headers. An idle connection at most has one buffer of this size allocated. Default is 4K. |
hostHeader | Set a forced valued for the <tt>Host</tt>header to control what <tt>ServletRequest#getServerName()</tt>and <tt>ServletRequest#getServerPort()</tt>return. This value is used only if <tt>forwarded</tt>is true. |
host | The particular interface to listen on. If not set or 0.0.0.0, Jetty listens on <tt>port</tt>on all interfaces. |
integralPort | The port to redirect to if there is a security constraint of INTEGRAL. |
lowResourcesConnections | Sets the number of connections, which if exceeded places this connector in a low resources state. This is not an exact measure as the connection count is averaged over the select sets. When in a low resources state, different idle timeouts can apply on connections. See <tt>lowResourcesMaxIdleTime</tt>. |
lowResourcesMaxIdleTime | Sets the period in ms that a connection is allowed to be idle when this there are more than <tt>lowResourcesConnections</tt>connections. This allows the server to rapidly close idle connections in order to gracefully handle high load situations. |
maxIdleTime | Set the maximum Idle time for a connection, which roughly translates to the Socket.setSoTimeout(int) call, although with NIO implementations other mechanisms may be used to implement the timeout. The max idle time is applied: when waiting for a new request to be received on a connection; when reading the headers and content of a request; when writing the headers and content of a response. Jetty interprets this value as the maximum time between some progress being made on the connection. So if a single byte is read or written, then the timeout (if implemented by Jetty) is reset. However, in many instances, the reading/writing is delegated to the JVM, and the semantic is more strictly enforced as the maximum time a single read/write operation can take. Note that as Jetty supports writes of memory-mapped file buffers, a write may take many 10s of seconds for large content written to a slow device. |
name | The name of the connector. Can be used to make a WebAppContext respond only to requests on the named connector via the <tt>WebAppContext.setConnectorNames(String[])</tt>method |
port | The port to listen on. See also <tt>host</tt>. |
requestBufferSize | Sets the size of the content buffer for receiving requests. These buffers are used only for active connections that have requests with bodies that do not fit within the header buffer (see <tt>headerBufferSize</tt>). Default is 8K. |
responseBufferSize | Sets the size of the content buffer for sending responses. These buffers are used only for active connections that are sending responses with bodies that will not fit within the header buffer. Default is 32K. |
resolveNames | If true, request IP addresses will be resolved to host names. |
reuseAddress | True if the the server socket will be opened in SO_REUSEADDR mode. |
soLingerTime | Sets SO_LINGER on the connection socket. Disabled by default. |
statsOn | If true, enables statistics collection on connections. See [[Jetty/Feature/Statistics|Statistics]]. |
useDirectBuffers | For nio connectors, determines whether direct byte buffers will be used or not. The default is true. |
threadPool | Sets the thread pool instance. By default this is the thread pool set on the org.eclipse.jetty.server.Server instance, and is a org.eclipse.jetty.util.thread.QueuedThreadPool instance. |