Web Container (webContainer)

Configuration for the web container.

Name	Type	Default	Description
addStrictTransportSecurityHeader	string		Enables the HTTP Strict Transport Security (HSTS) header for HTTPS responses and allows a value to be set for that header, for example: "max-age=31536000;includeSubDomains". HSTS can also be configured in the web.xml file by setting the "com.ibm.ws.webcontainer.ADD_STS_HEADER_WEBAPP" context parameter.
allowExpressionFactoryPerApp	boolean	false	Toggle to load the ExpressionFactory that is set by the application. Enable this custom property if you are using a custom EL implementation (for example, JUEL) that needs to set its own ExpressionFactory.
allowIncludeSendError	boolean	false	Allow RequestDispatch to send errors on Include methods. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.allowincludesenderror.
allowQueryParamWithNoEqual	boolean		When this property is set to true, if the query parameter in a URL contains only the string name, the server returns an empty string as the value for the request.getParameter(name) query. When this property is set to false, the server returns null as the value for the request.getParameter(name) query. The default value is false, but is true for servlet 5.0 and higher.
asyncMaxSizeTaskPool	int	5000	Maximum size of tasks in the Async task pool before automatically purging canceled tasks. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.asyncmaxsizetaskpool.
asyncPurgeInterval	int	30000	Time interval to wait between each required purge of the cancelled task pool. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.asyncpurgeinterval.
asyncTimeoutDefault	int	30000	Async servlet timeout value used when a timeout value has not been explcitly specified. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.asynctimeoutdefault.
asyncTimerThreads	int	2	Maximum number of threads to use for async servlet timeout processing. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.asynctimerthreads.
copyAttributesKeySet	boolean	false	Web container will return an enumeration of a copy of the list of attributes to the servlet to avoid a concurrent access error by the servlet. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.copyattributeskeyset.
decodeUrlAsUtf8	boolean	true	Decode URLs using an encoding setting of UTF-8.
decodeUrlPlusSign	boolean		Decode the plus sign when it is part of the URL. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.decodeurlplussign. For servlet-5.0 and newer Servlet features, the default value is false.
defaultHeadRequestBehavior	boolean	false	Restore the behavior where the HEAD request is not subject to the security constraint defined for the GET method. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.DefaultHeadRequestBehavior.
defaultTraceRequestBehavior	boolean	false	Restore HTTP TRACE processing. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.DefaultTraceRequestBehavior.
deferServletLoad	boolean	true	Defer servlet loading from application server startup.
deferServletRequestListenerDestroyOnError	boolean		Toggle if you want to defer ServletRequestListener destroy when there is an error serving the request. The default value is false, but is true for servlet 5.0 and later. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.deferServletRequestListenerDestroyOnError.
directoryBrowsingEnabled	boolean	false	Enable directory browsing of an application.
disableXPoweredBy	boolean		When this property is set to true, the X-Powered-By header is not set. In servlet-5.0 and later, the default value is true. In servlet-4.0 and earlier, the X-Powered-By header is set by default. This property is configurable only in servlet-5.0 and earlier. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.disablexpoweredby.
disallowAllFileServing	boolean	false	Disables all file serving by applications. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.disallowAllFileServing.
disallowServeServletsByClassName	boolean	true	Disallows the use of serveServletsByClassnameEnabled on the application server level. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.disallowserveservletsbyclassname.
dispatcherRethrowsEr	boolean	true	Web container will re-throw errors allowing interested resources to process them. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.dispatcherRethrowser.
doNotServeByClassName	string		A semi-colon delimited list of classes to be completely disallowed from being served by classname. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.donotservebyclassname.
emptyServletMappings	boolean	false	Toggle if you want to return an empty collection, instead of null, when no servlet mappings are added. The default value is false. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.emptyservletmappings.
enableDefaultIsElIgnoredInTag	boolean	false	Always evaluate whether to ignore EL expressions in tag files. If parent JSP files have different isELIgnored settings, the setting will be re-evaluated in the tag file. The equivalent custom property in the full profile application server is com.ibm.ws.jsp.enabledefaultiselignoredintag.
enableErrorExceptionTypeFirst	boolean	false	Web container is updated to search and use the exception-type before the error-code. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.enableErrorExceptionTypeFirst.
enableJspMappingOverride	boolean	false	Allow the JSP mapping to be overridden so that the application can serve the JSP contents itself. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.enablejspmappingoverride.
enableMultiReadOfPostData	boolean	false	Retain post data for multiple read accesses. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.enablemultireadofpostdata.
excludeAllHandledTypesClasses	boolean		When this property is set to true, during startup, ServletContainerInitializer implementors that use the HandlesTypes annotation do not receive classes that are specified as HandlesTypes parameters.
exposeWebInfOnDispatch	boolean	false	When this property is set to true, a servlet can access static files in the WEB-INF directory. When this property is set to false, which is the default, a servlet cannot access static files in the WEB-INF directory.
fileServingEnabled	boolean	true	Enable file serving if this setting was not explicitly specified for the application.
fileWrapperEvents	boolean	false	Web container will generate SMF and PMI data when serving the static files. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.fileWrapperEvents.
getRealPathReturnsQualifiedPath	boolean	true	Return non-null paths from the ServletContext.getRealPath(String) method, even if no resource exists at the given path. The default is true. If applications expect the getRealPath method to return null when given a path for which no resource exists, set the property to false.
httpsIndicatorHeader	string		For SSL offloading, set to the name of the HTTP header variable inserted by the SSL accelerator/proxy/load balancer.
ignoreSemiColonOnRedirectToWelcomePage	boolean	false	Toggle to ignore the trailing semicolon when redirecting to the welcome page. The default value is false. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.ignoreSemiColonOnRedirectToWelcomePage.
ignoreSessiononStaticFileRequest	boolean	false	Improves performance by preventing the web container from accessing a session for static file requests involving filters. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.IgnoreSessiononStaticFileRequest.
invokeFilterInitAtStartup	boolean	true	Web container will call the filter's init() method at application startup. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.invokeFilterInitAtStartup.
listeners	string		A comma separated list of listener classes.
logServletContainerInitializerClassLoadingErrors	boolean	false	Log servlet container class loading errors as warnings rather than logging them only when debug is enabled. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.logservletcontainerinitializerclassloadingerrors.
metaInfResourcesCacheSize	int	20	Initial size (number of entries) of the meta-inf resource cache. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.metainfresourcescachesize.name.
parseUtf8PostData	boolean	false	Web container will detect non URL encoded UTF-8 post data and include it in the parameter values. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.parseutf8postdata.
redirectToRelativeUrl	boolean	false	Send redirect response to a relative URL location without processing it. Set this property to true to send redirect response without converting the URL to an absolute location.
serveServletsByClassnameEnabled	boolean	false	Enable servlets to be accessed in a web application using a class name if not explicitly specified.
servletDestroyWaitTime	int	60	Wait time in seconds for an active request to complete when the owning application is stopped. The default value is 60 seconds. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.servletDestroyWaitTime.
servletPathForDefaultMapping	string		Set the servlet path value to the request URI minus the context path. The path information is null when a servlet is used as a default mapping. The default value is true for version 4.0 or later of the servlet feature. It is false for other servlet features. When mapping is to the /* pattern, the servlet path is empty and the path information starts with a leading slash (/).
setContentLengthOnClose	boolean	true	Toggle to set content length when an application explicitly closes the response. The default value is true; however, set this value to false if an application response contains double-byte characters.
setHtmlContentTypeOnError	boolean	true	When this property is false, the webcontainer will not set the response's content type header during the error handling process. An application is responsible to set the response's content type. The default value (true) sets the content type to "text/html".
skipEncodedCharVerification	boolean	false	A request is rejected if the request URI contains the %23, %2E, %2F, or %5C encoded characters. When this property is set to true, the request URI is not checked for these encoded characters. This property is available starting in servlet 6.0, and default value is false.
skipMetaInfResourcesProcessing	boolean	false	Do not search the meta-inf directory for application resources. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.skipmetainfresourcesprocessing.
stopAppStartUponListenerException	boolean		Some web applications depend on context listeners for setup before the web application starts. When this property is set to true, the application stops starting up when an unhandled exception is thrown from the context listeners. For servlet-5.0 and newer Servlet features, the default value is true.
symbolicLinksCacheSize	int	1000	Initial size of the symbolic link cache. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.SymbolicLinksCacheSize.
throwExceptionWhenUnableToCompleteOrDispatch	boolean	true	Throw an illegal state exception when an asynchronous request cannot be completed or dispatched. The default is true. If the asynchronous request must complete or the dispatch method must return, even if the call does not succeed, set the property to false.
tolerateSymbolicLinks	boolean	false	Enables the web container to support the use of symbolic links. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.TolerateSymbolicLinks.
useSemiColonAsDelimiterInURI	boolean	false	Toggle to use the semicolon as a delimiter in the request URI. The default value is false. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.useSemiColonAsDelimiterInURI.
xPoweredBy	string		Alternative string for the X-Powered-By header setting. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.xpoweredby. There is no default value for this property. If the property is not set, the value of the X-Powered-By header is set to Servlet/<servlet spec version>, as defined by the Servlet specification.

Name

Type

Default

Description

addStrictTransportSecurityHeader

string

Enables the HTTP Strict Transport Security (HSTS) header for HTTPS responses and allows a value to be set for that header, for example: "max-age=31536000;includeSubDomains". HSTS can also be configured in the web.xml file by setting the "com.ibm.ws.webcontainer.ADD_STS_HEADER_WEBAPP" context parameter.

allowExpressionFactoryPerApp

boolean

false

Toggle to load the ExpressionFactory that is set by the application. Enable this custom property if you are using a custom EL implementation (for example, JUEL) that needs to set its own ExpressionFactory.

allowIncludeSendError

boolean

false

Allow RequestDispatch to send errors on Include methods. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.allowincludesenderror.

allowQueryParamWithNoEqual

boolean

When this property is set to true, if the query parameter in a URL contains only the string name, the server returns an empty string as the value for the request.getParameter(name) query. When this property is set to false, the server returns null as the value for the request.getParameter(name) query. The default value is false, but is true for servlet 5.0 and higher.

asyncMaxSizeTaskPool

int

5000

Maximum size of tasks in the Async task pool before automatically purging canceled tasks. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.asyncmaxsizetaskpool.

asyncPurgeInterval

int

30000

Time interval to wait between each required purge of the cancelled task pool. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.asyncpurgeinterval.

asyncTimeoutDefault

int

30000

Async servlet timeout value used when a timeout value has not been explcitly specified. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.asynctimeoutdefault.

asyncTimerThreads

int

Maximum number of threads to use for async servlet timeout processing. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.asynctimerthreads.

copyAttributesKeySet

boolean

false

Web container will return an enumeration of a copy of the list of attributes to the servlet to avoid a concurrent access error by the servlet. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.copyattributeskeyset.

decodeUrlAsUtf8

boolean

true

Decode URLs using an encoding setting of UTF-8.

decodeUrlPlusSign

boolean

Decode the plus sign when it is part of the URL. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.decodeurlplussign. For servlet-5.0 and newer Servlet features, the default value is false.

defaultHeadRequestBehavior

boolean

false

Restore the behavior where the HEAD request is not subject to the security constraint defined for the GET method. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.DefaultHeadRequestBehavior.

defaultTraceRequestBehavior

boolean

false

Restore HTTP TRACE processing. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.DefaultTraceRequestBehavior.

deferServletLoad

boolean

true

Defer servlet loading from application server startup.

deferServletRequestListenerDestroyOnError

boolean

Toggle if you want to defer ServletRequestListener destroy when there is an error serving the request. The default value is false, but is true for servlet 5.0 and later. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.deferServletRequestListenerDestroyOnError.

directoryBrowsingEnabled

boolean

false

Enable directory browsing of an application.

disableXPoweredBy

boolean

When this property is set to true, the X-Powered-By header is not set. In servlet-5.0 and later, the default value is true. In servlet-4.0 and earlier, the X-Powered-By header is set by default. This property is configurable only in servlet-5.0 and earlier. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.disablexpoweredby.

disallowAllFileServing

boolean

false

Disables all file serving by applications. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.disallowAllFileServing.

disallowServeServletsByClassName

boolean

true

Disallows the use of serveServletsByClassnameEnabled on the application server level. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.disallowserveservletsbyclassname.

dispatcherRethrowsEr

boolean

true

Web container will re-throw errors allowing interested resources to process them. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.dispatcherRethrowser.

doNotServeByClassName

string

A semi-colon delimited list of classes to be completely disallowed from being served by classname. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.donotservebyclassname.

emptyServletMappings

boolean

false

Toggle if you want to return an empty collection, instead of null, when no servlet mappings are added. The default value is false. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.emptyservletmappings.

enableDefaultIsElIgnoredInTag

boolean

false

Always evaluate whether to ignore EL expressions in tag files. If parent JSP files have different isELIgnored settings, the setting will be re-evaluated in the tag file. The equivalent custom property in the full profile application server is com.ibm.ws.jsp.enabledefaultiselignoredintag.

enableErrorExceptionTypeFirst

boolean

false

Web container is updated to search and use the exception-type before the error-code. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.enableErrorExceptionTypeFirst.

enableJspMappingOverride

boolean

false

Allow the JSP mapping to be overridden so that the application can serve the JSP contents itself. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.enablejspmappingoverride.

enableMultiReadOfPostData

boolean

false

Retain post data for multiple read accesses. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.enablemultireadofpostdata.

excludeAllHandledTypesClasses

boolean

When this property is set to true, during startup, ServletContainerInitializer implementors that use the HandlesTypes annotation do not receive classes that are specified as HandlesTypes parameters.

exposeWebInfOnDispatch

boolean

false

When this property is set to true, a servlet can access static files in the WEB-INF directory. When this property is set to false, which is the default, a servlet cannot access static files in the WEB-INF directory.

fileServingEnabled

boolean

true

Enable file serving if this setting was not explicitly specified for the application.

fileWrapperEvents

boolean

false

Web container will generate SMF and PMI data when serving the static files. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.fileWrapperEvents.

getRealPathReturnsQualifiedPath

boolean

true

Return non-null paths from the ServletContext.getRealPath(String) method, even if no resource exists at the given path. The default is true. If applications expect the getRealPath method to return null when given a path for which no resource exists, set the property to false.

httpsIndicatorHeader

string

For SSL offloading, set to the name of the HTTP header variable inserted by the SSL accelerator/proxy/load balancer.

ignoreSemiColonOnRedirectToWelcomePage

boolean

false

Toggle to ignore the trailing semicolon when redirecting to the welcome page. The default value is false. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.ignoreSemiColonOnRedirectToWelcomePage.

ignoreSessiononStaticFileRequest

boolean

false

Improves performance by preventing the web container from accessing a session for static file requests involving filters. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.IgnoreSessiononStaticFileRequest.

invokeFilterInitAtStartup

boolean

true

Web container will call the filter's init() method at application startup. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.invokeFilterInitAtStartup.

listeners

string

A comma separated list of listener classes.

logServletContainerInitializerClassLoadingErrors

boolean

false

Log servlet container class loading errors as warnings rather than logging them only when debug is enabled. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.logservletcontainerinitializerclassloadingerrors.

metaInfResourcesCacheSize

int

Initial size (number of entries) of the meta-inf resource cache. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.metainfresourcescachesize.name.

parseUtf8PostData

boolean

false

Web container will detect non URL encoded UTF-8 post data and include it in the parameter values. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.parseutf8postdata.

redirectToRelativeUrl

boolean

false

Send redirect response to a relative URL location without processing it. Set this property to true to send redirect response without converting the URL to an absolute location.

serveServletsByClassnameEnabled

boolean

false

Enable servlets to be accessed in a web application using a class name if not explicitly specified.

servletDestroyWaitTime

int

Wait time in seconds for an active request to complete when the owning application is stopped. The default value is 60 seconds. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.servletDestroyWaitTime.

servletPathForDefaultMapping

string

Set the servlet path value to the request URI minus the context path. The path information is null when a servlet is used as a default mapping. The default value is true for version 4.0 or later of the servlet feature. It is false for other servlet features. When mapping is to the /* pattern, the servlet path is empty and the path information starts with a leading slash (/).

setContentLengthOnClose

boolean

true

Toggle to set content length when an application explicitly closes the response. The default value is true; however, set this value to false if an application response contains double-byte characters.

setHtmlContentTypeOnError

boolean

true

When this property is false, the webcontainer will not set the response's content type header during the error handling process. An application is responsible to set the response's content type. The default value (true) sets the content type to "text/html".

skipEncodedCharVerification

boolean

false

A request is rejected if the request URI contains the %23, %2E, %2F, or %5C encoded characters. When this property is set to true, the request URI is not checked for these encoded characters. This property is available starting in servlet 6.0, and default value is false.

skipMetaInfResourcesProcessing

boolean

false

Do not search the meta-inf directory for application resources. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.skipmetainfresourcesprocessing.

stopAppStartUponListenerException

boolean

Some web applications depend on context listeners for setup before the web application starts. When this property is set to true, the application stops starting up when an unhandled exception is thrown from the context listeners. For servlet-5.0 and newer Servlet features, the default value is true.

symbolicLinksCacheSize

int

1000

Initial size of the symbolic link cache. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.SymbolicLinksCacheSize.

throwExceptionWhenUnableToCompleteOrDispatch

boolean

true

Throw an illegal state exception when an asynchronous request cannot be completed or dispatched. The default is true. If the asynchronous request must complete or the dispatch method must return, even if the call does not succeed, set the property to false.

tolerateSymbolicLinks

boolean

false

Enables the web container to support the use of symbolic links. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.TolerateSymbolicLinks.

useSemiColonAsDelimiterInURI

boolean

false

Toggle to use the semicolon as a delimiter in the request URI. The default value is false. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.useSemiColonAsDelimiterInURI.

xPoweredBy

string

Alternative string for the X-Powered-By header setting. The equivalent custom property in the full application server profile is com.ibm.ws.webcontainer.xpoweredby. There is no default value for this property. If the property is not set, the value of the X-Powered-By header is set to Servlet/<servlet spec version>, as defined by the Servlet specification.