I cannot get HttpServletResponse.sendRedirect() to work correctly. This only happens to me with Wildfly. It works on previous versions of JBoss EAP/AS and several other app servers where I tested the scenario.

The sample app has two servlet. I navigate from one to the other using sendRedirect. The key seems to be relative path in the form "../whatever/whatever" is not working.

To test this, I enter my app's URL like this-
http://localhost:8080/helloworld/hello

Then, inside the first servlet, I do a redirect -
String url = "../goodbye/bye";
response.sendRedirect(response.encodeRedirectURL(url));

wildfly 8 gives me a HTTP Status 404. wildfly 8.1 CR1 gives me a HTTP Status 403. All other app server works. It takes me to this url:

http://localhost:8080/goodbye/bye

JBoss eap-6-1-0
Status Host Path
302 localhost:8080 /helloworld/hello
200 localhost:8080 /goodbye/bye/

WildFly 8.0 Final
Status Host Path
302 localhost:8080 /helloworld/hello
404 localhost:8080 /helloworld/

WildFly 8.1.0 CR1 Final
Status Host Path
302 localhost:8080 /helloworld/hello
403 localhost:8080 /helloworld/

This behavior also appears to be different than that of java.net.URL,
public URL(URL context, String spec)
throws MalformedURLException
which states this: If the spec's path component begins with a slash character "/" then the path is treated as absolute and the spec path replaces the context path.

Otherwise, the path is treated as a relative path and is appended to the context path, as described in RFC2396. Also, in this case, the path is canonicalized through the removal of directory changes made by occurences of ".." and ".".