https://issues.apache.org/bugzilla/show_bug.cgi?id=52586
Bug #: 52586
Summary: When requests are forwarded, the request attribute
javax.servlet.forward.path_info is assigned an
incorrect value.
Product: Tomcat 7
Version: 7.0.23
Platform: PC
OS/Version: Linux
Status: NEW
Severity: major
Priority: P2
Component: Servlet & JSP API
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
As per the servlet spec, the values for:
javax.servlet.forward.request_uri
javax.servlet.forward.context
javax.servlet.forward.servlet_path
javax.servlet.forward.path_info
javax.servlet.forward.query_string
MUST be set to the values from the very first servlet that serviced the current
request. However, it seems that Tomcat is populating path_info with the value
of the LAST path_info serviced in the request (i.e. the final servlet that
serviced the request). It's possible the other value assignments are afflicted
by similar defects, I've not explicitly tested for this.
Because of this issue, it's impossible to correctly reconstruct the original
request's URI piecemeal by concatenating
context+servlet_path+path_info+?+query_string, since path_info will contain the
path to another servlet and thus this concatenation will produce a probably
invalid URI target.
Therefore, creating "click here to retry" links is impossible without
workaround code.
The critical issue here is the deviation from the servlet spec, which spells
out the behavior of those attributes.
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