1 Overview of Oracle WebLogic Server Proxy Plug-In

This chapter describes the plug-ins provided by Oracle for use with WebLogic Server:

What are Oracle WebLogic Server Proxy Plug-Ins?

Web server plug-ins allow requests to be proxied from Oracle HTTP Server, Oracle iPlanet Web Server, Apache HTTP Server, or Microsoft Internet Information Server (IIS) to Oracle WebLogic Server. In this way, plug-ins enable the HTTP server to communicate with applications deployed on the WebLogic Server.

The plug-in enhances an HTTP server installation by allowing Oracle WebLogic Server to handle requests that require dynamic functionality. In other words, you typically use a plug-in where the HTTP server serves static pages such as HTML pages, while Oracle WebLogic Server serves dynamic pages such as HTTP Servlets and Java Server Pages (JSPs).

Oracle WebLogic Server may be operating in a different process, possibly on a different host. To the end user—the browser—the HTTP requests delegated to Oracle WebLogic Server still appear to be coming from the HTTP server.

In addition, the HTTP-tunneling facility of the WebLogic client/server protocol also operates through the plug-in, providing access to all Oracle WebLogic Server services.

Connection Pooling and Keep-Alive

The plug-ins improve performance using a pool of connections from the plug-in to Oracle WebLogic Server. The plug-in implements HTTP 1.1 keep-alive connections between the plug-in and Oracle WebLogic Server by reusing the same connection for subsequent requests from the same plug-ins. If the connection is inactive for more than 20 seconds, (or a user-defined amount of time), the connection is closed. See KeepAliveEnabled.


The web server manages client connections.

Proxying Requests

The plug-in proxies requests to Oracle WebLogic Server based on a configuration that you specify.

  • You can proxy requests based on the URL of the request or a portion of the URL. This is called proxying by path.

  • You can also proxy a request based on the MIME type of the requested file, which is called proxying by file extension.

You can also enable both methods. If you enable both methods and a request matches both criteria, the request is proxied by path.

You can also specify additional parameters for each of these types of requests that define additional behavior of the plug-in.

Availability of Oracle WebLogic Server Proxy Plug-In

Oracle WebLogic Server Proxy Plug-Ins are available for the following web servers:

Table 1-1 Availability of Version 12c ( Plug-Ins

Web Server Plug-In Availability More Information

Oracle HTTP Server 12c

The plug-in is included in the Oracle HTTP Server installation.

For information about configuring this plug-in, see Configuring the Plug-In for Oracle HTTP Server.

Oracle iPlanet Web Server (7.0.9 and later releases)

Apache HTTP Server 2.2.x

Microsoft Internet Information Server (IIS) 7.0 and later

The plug-ins are available for download on the My Oracle Support (http://support.oracle.com) and Software Delivery Cloud (http://edelivery.oracle.com) web sites as zip files containing the necessary binary and helper files.

For example, the following directories are included in the mod_wl.so plug-in distribution.

  • lib/mod_wl.so (Apache HTTP Server plug-in)

  • lib/*.so (native libraries)

  • bin/orapki or bin\orapki.bat (orapki tool)

  • jlib/*.jar (Java helper libraries for orapki)

For information about installing and configuring the plug-ins for Apache HTTP Server, Oracle iPlanet, and Microsoft IIS Web Servers, see the following:

Upgrading from 1.0 Plug-Ins

The version 1.0 plug-ins are deprecated and are not guaranteed to be available for future versions of Oracle WebLogic Server. The version 12c ( plug-ins are the recommended replacement.


For Apache HTTP Server 1.3.x or 2.0.x, continue to use the version 1.0 plug-in.

This section contains the following information:

Upgrade Instructions

For upgrading from 11g plug-ins to the Oracle WebLogic Server Proxy Plug-Ins 12c (, use installation instructions included in the specific chapter for your web server, as listed in Table 1-2.

Table 1-2 Upgrade Instructions by Plug-In

To upgrade to the 12c ( plug-ins for: See:

Oracle HTTP Server

Configuring the Plug-In for Oracle HTTP Server

Apache HTTP Server

Configuring the Plug-In for Apache HTTP Server

iPlanet Web Server

Configuring the Plug-In for iPlanet Web Server

Microsoft IIS Web Server

Configuring the Plug-In for Microsoft IIS Web Server

Considerations for Upgrading From Oracle WebLogic Server Proxy Plug-Ins Version 1.0 to 12c (

The version 12c ( plug-ins are a superset of the version 1.0 plug-ins and support the existing features. However, when you upgrade, keep the following considerations in mind:

  • The list of supported platforms has changed. See Oracle Fusion Middleware Supported System Configurations at:


  • Because the version 1.0 plug-ins supported both 40- and 128-bit encryption standards, the plug-in file names needed to identify which standard was supported. For example, mod_wl_22.so indicated 40-bit encryption and mod_wl128_22.so indicated 128-bit encryption. However, the version 12c ( plug-ins support only 128-bit encryption, and the plug-in names are now simplified. For example, mod_wl.so is the only file name required.


    If you upgrade from the 1.0 plug-ins and had been using 128-bit encryption, you must change your configuration file to reflect the new naming convention. For example, you must change mod_wl128_22.so to mod_wl.so.

Features of the Version Plug-Ins

This section describes the additional features of the version 12c ( plug-ins.

Oracle WebLogic Server Proxy Monitoring

The current release adds support for monitoring the performance of the Oracle HTTP Server. The performance metrics are specific to the Oracle WebLogic Server Proxy Plug-In where a request is proxied to the backend WebLogic server. See Understanding Oracle WebLogic Server Proxy Plug-In Performance Metrics.

Support for Multi-tenancy and Partitions

In the current release, Oracle WebLogic Server Proxy Plug-Ins can be made partition-aware. This plays a role in support of Oracle WebLogic Server MT (multi-tenancy). See Working with Partitions.

SSL Support for IPlanet Web Server

In the current release, support has been added for using SSL with the iPlanet Web Server. See Configuring SSL with the Plug-In for iPlanet Web Server.

Documentation for Using the Plug-In with Microsoft IIS

Instructions have been added to use Oracle WebLogic Server Proxy Plug-Ins with Microsoft IIS Web Server. See Installing and Configuring the Plug-In for Microsoft Internet Information Server.

Deprecated Support for Certificates Signed Using the MD5 Algorithm

Support for certificates signed with MD5 is deprecated. See Replacing Certificates Signed Using the MD5 Algorithm.

Support and Patching

When you encounter issues with a plug-in, always report the version of the plug-in you are using. You can find this information in the apache log or the plug-in debug log (if configured). The version information looks like the following snippet:

WebLogic Server Plug-in version <WLSPLUGINS_XXXX_XXXX_XXXXX.XXXX>


On the Apache Web Server for Linux, you can also obtain the plug-in version by issuing the following command:

$ strings ${PLUGIN_HOME}/lib/mod_wl.so | grep -i wlsplugins

A patch for a plug-in typically will contain one or more shared objects to be replaced. Ensure to backup your original files as you replace them with those in the patch. Validate that the patch has been correctly updated by checking the version string in the logs.