Allow for non-relative redirects for buggy servlet containers
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Key: WICKET-3258
URL: https://issues.apache.org/jira/browse/WICKET-3258
Project: Wicket
Issue Type: Improvement
Components: wicket
Affects Versions: 1.5-M3, 1.4.14
Environment: Websphere
Reporter: Jeremy Thomerson
Assignee: Jeremy Thomerson
Priority: Minor
There appears to be a bug in the way WebSphere handles relative URLs. The
servlet spec
(http://jcp.org/aboutJava/communityprocess/final/jsr154/index.html), page 260
specifies the behavior for relative URLs, which Wicket uses, but WebSphere
appears to ignore. If we send a relative URL like "../../Something.html" to
HttpServletResponse#sendRedirect, the relative path should be relative *to the
requested URI* (the page I was requesting that resulted in the redirect).
WebSphere isn't implementing this behavior correctly. Instead, it appears to
interpret it as relative *to the app context and servlet mapping*.
More details:
We request a page like:
http://[server]:[serverport]/[appcontext]/[servletmapping]/somefolder/someotherfolder/foo.html
That page results in an error, and Wicket tries to redirect to an unmounted
bookmarkable page by doing
sendRedirect("../../?wicket:bookmarkablePage=:com.FooPage"). This is correct
according to the servlet spec, because the url passed to sendRedirect should be
relative *to the requested URI* (<--- this is the key). So, we expect the
container to redirect to
http://[server]:[serverport]/[appcontext]/[servletmapping]/?wicket:bookmarkable=com.FooPage
. Jetty does (and Tomcat and others). But, WebSphere does not.
Although I cannot look at the Websphere code, I suspect that it is interpreting
this relative URL as being relative to the root of the servlet mapping. It is
then removing two folders, which takes us back to the server root (instead of
the servlet mapping, like it should), removing the app context and servlet
mapping (i.e. http://[server]:[serverport]/?wicket:bookmarkable=com.FooPage)
This is obviously incorrect.
We have tried this compatibility setting (true and false), but it didn't work:
https://publib.boulder.ibm.com/infocenter/wasinfo/v6r1/index.jsp?topic=/com.ibm.websphere.nd.doc/info/ae/ae/xrun_jvm_sendredirect.html
There are a lot of reports about the problem:
http://www.mail-archive.com/[email protected]/msg68864.html
https://issues.apache.org/jira/browse/STR-1843?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel
http://www.mail-archive.com/[email protected]/msg06308.html
Although we obviously can't fix the issue, we should provide a way for users of
these servlet containers to redirect to an absolute URL rather than a relative
URL.
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