https://issues.apache.org/bugzilla/show_bug.cgi?id=50413
Summary: Tomcat returns 302 instead of 404 response for static
custom 404 error file
Product: Tomcat 7
Version: 7.0.5
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: minor
Priority: P2
Component: Catalina
AssignedTo: [email protected]
ReportedBy: [email protected]
When using a static html file for 404 errors and the client sends a request to
a file whoch doesn't exist, and adds a "If-Modified-Since" header with a date
that is newer than the modification date of the static error file, then Tomcat
returns "302 Not Modofied" instead of "404 Not Found".
Steps to reproduce:
1) Make a simple webapp that uses a static html file as custom error page for
404 errors, like this (web.xml):
<error-page>
<error-code>404</error-code>
<location>/errorpages/404.html</location>
</error-page>
2) Do a GET request to a URL which points to a file that doesn't exist, and add
a "If-Modified-Since" header with a date that is newer than the modification
date of the 404 error file (the date may also be in the future), e.g.
GET /MyWebApp/AUrlToAFileWhichDoesNotExist.gif HTTP/1.1
Host: localhost
Keep-Alive: 115
Connection: keep-alive
If-Modified-Since: Tue, 08 Nov 2015 15:07:52 GMT
(replace "MyWebApp" with your webapp's name)
3) Tomcat returns "HTTP/1.1 302 Not Modified" instead of "HTTP/1.1 404 Not
Found".
Actual Results: Tomcat returns a "302 Not Modified" response, because it seems
to compare the date of the "If-Modified-Header" with the date of the static 404
error file.
Expected Results: Tomcat returns a "404 Not Found" response, because the
requested file does not exist.
If you omit the "If-Modified-Since" header or use a date that is older than the
date of the error file, Tomcat correctly returns "404 Not Found", but adds an
"Last-Modified" header with the modification date of the 404 file.
This behavior caused invalid 302 responses to be sent over the ISAPI redirector
(bug 50363, with enabled chunked encoding support) when I was viewing my site
in Firefox and pressed F5 to refresh it, because I think as of bug 49591,
Tomcat uses chunked encoding for this response, which the ISAPI redirector
didn't check.
I tested on Tomcat 7.0.5 on 32-Bit Windows XP, with Tomcat Native 1.1.20, on
Java 1.6.0_22.
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