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Apache Tomcat Configuration Reference - The AJP Connector

    The Apache Tomcat Servlet/JSP Container

The Apache Tomcat Servlet/JSP Container

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Apache Tomcat Configuration Reference

The AJP Connector

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Introduction

The AJP Connector element represents a Connector component that communicates with a web connector via the AJP protocol. This is used for cases where you wish to invisibly integrate Tomcat 5 into an existing (or new) Apache installation, and you want Apache to handle the static content contained in the web application, and/or utilize Apache's SSL processing.

This connector supports load balancing when used in conjunction with the jvmRoute attribute of the Engine.

The native connectors supported with this Tomcat release are:

  • JK 1.2.x with any of the supported servers
  • mod_proxy on Apache httpd 2.x (included by default in Apache HTTP Server 2.2), with AJP enabled

Other native connectors supporting AJP may work, but are no longer supported.

Attributes
Common Attributes

All implementations of Connector support the following attributes:

AttributeDescription
allowTrace

A boolean value which can be used to enable or disable the TRACE HTTP method. If not specified, this attribute is set to false.

emptySessionPath

If set to true, all paths for session cookies will be set to /. This can be useful for portlet specification implementations, but will greatly affect performance if many applications are accessed on a given server by the client. If not specified, this attribute is set to false.

enableLookups

Set to true if you want calls to request.getRemoteHost() to perform DNS lookups in order to return the actual host name of the remote client. Set to false to skip the DNS lookup and return the IP address in String form instead (thereby improving performance). By default, DNS lookups are enabled.

maxPostSize

The maximum size in bytes of the POST which will be handled by the container FORM URL parameter parsing. The feature can be disabled by setting this attribute to a value less than or equal to 0. If not specified, this attribute is set to 2097152 (2 megabytes).

maxSavePostSize

The maximum size in bytes of the POST which will be saved/buffered by the container during FORM or CLIENT-CERT authentication. For both types of authentication, the POST will be saved/buffered before the user is authenticated. For CLIENT-CERT authentication, the POST is buffered for the duration of the SSL handshake and the buffer emptied when the request is processed. For FORM authentication the POST is saved whilst the user is re-directed to the login form and is retained until the user successfully authenticates or the session associated with the authentication request expires. The limit can be disabled by setting this attribute to -1. Setting the attribute to zero will disable the saving of POST data during authentication. If not specified, this attribute is set to 4096 (4 kilobytes).

protocol

This attribute value must be AJP/1.3 to use the AJP handler.

proxyName

If this Connector is being used in a proxy configuration, configure this attribute to specify the server name to be returned for calls to request.getServerName(). See Proxy Support for more information.

proxyPort

If this Connector is being used in a proxy configuration, configure this attribute to specify the server port to be returned for calls to request.getServerPort(). See Proxy Support for more information.

redirectPort

If this Connector is supporting non-SSL requests, and a request is received for which a matching <security-constraint> requires SSL transport, Catalina will automatically redirect the request to the port number specified here.

request.registerRequests

This attribute controls request registration for JMX monitoring of the Connector. It is enabled by default, but may be turned it off to save a bit of memory.

scheme

Set this attribute to the name of the protocol you wish to have returned by calls to request.getScheme(). For example, you would set this attribute to "https" for an SSL Connector. The default value is "http". See SSL Support for more information.

secure

Set this attribute to true if you wish to have calls to request.isSecure() to return true for requests received by this Connector (you would want this on an SSL Connector). The default value is false.

URIEncoding

This specifies the character encoding used to decode the URI bytes, after %xx decoding the URL. If not specified, ISO-8859-1 will be used.

useBodyEncodingForURI

This specifies if the encoding specified in contentType should be used for URI query parameters, instead of using the URIEncoding. This setting is present for compatibility with Tomcat 4.1.x, where the encoding specified in the contentType, or explicitely set using Request.setCharacterEncoding method was also used for the parameters from the URL. The default value is false.

useIPVHosts

Set this attribute to true to cause Tomcat to use the ServerName passed by the native web server to determine the Host to send the request to. The default value is false.

xpoweredBy

Set this attribute to true to cause Tomcat to advertise support for the Srevlet specification using the header recommended in the specification. The default value is false.

Standard Implementation

To use AJP, you must specify the protocol attribute (see above).

This implementation supports the AJP 1.3 protocol.

It supports the following additional attributes (in addition to the common attributes listed above):

AttributeDescription
address

For servers with more than one IP address, this attribute specifies which address will be used for listening on the specified port. By default, this port will be used on all IP addresses associated with the server. A value of 127.0.0.1 indicates that the Connector will only listen on the loopback interface.

backlog

The maximum queue length for incoming connection requests when all possible request processing threads are in use. Any requests received when the queue is full will be refused. The default value is 10.

bufferSize

The size of the output buffer to use. If less than or equal to zero, then output buffering is disabled. The default value is -1 (i.e. buffering disabled)

connectionTimeout

The number of milliseconds this Connector will wait, after accepting a connection, for the request URI line to be presented. The default value is infinite (i.e. no timeout).

minProcessors deprecated

The minimum number of processors to start at initialization time. If not specified, this atttribute is set to 5.

maxProcessors deprecated

The maximum number of processors allowed. This should be set to a value that is greater than or equal to the maximum number of concurrent connections the remote web server can open to Tomcat simultaneously. For example, if the web server is Apache 1.x or 2.x Tomcat's maxProcessors should be set to the value of Apache's maxClients directive.

A maxProcessors value of zero (0) signifies that the number of processors is unlimited. If not specified, this atttribute defaults to 20.

maxSpareThreads

The maximum number of unused request processing threads that will be allowed to exist until the thread pool starts stopping the unnecessary threads. The default value is 50.

maxThreads

The maximum number of request processing threads to be created by this Connector, which therefore determines the maximum number of simultaneous requests that can be handled. If not specified, this attribute is set to 200.

minSpareThreads

The number of request processing threads that will be created when this Connector is first started. The connector will also make sure it has the specified number of idle processing threads available. This attribute should be set to a value smaller than that set for maxThreads. The default value is 4.

port

The TCP port number on which this Connector will create a server socket and await incoming connections. Your operating system will allow only one server application to listen to a particular port number on a particular IP address.

tcpNoDelay

If set to true, the TCP_NO_DELAY option will be set on the server socket, which improves performance under most circumstances. This is set to true by default.

tomcatAuthentication

If set to true, the authetication will be done in Tomcat. Otherwise, the authenticated principal will be propagated from the native webaserver and used for authorization in Tomcat. The default value is true.

Nested Components

None at this time.


Copyright © 1999-2006, Apache Software Foundation

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java 1.6, Tomcat 6, MySQL 5, Apache 2.2 and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


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