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Edwin,
On 6/20/2011 5:01 PM, Edwin Eversdijk wrote:
> When I send a 304 response status, i send also the lastmodified header. It
> shows
> on tomcat directly via 8080. But via mod_jk/apache http server it's
> missing...
I see the same behavior with this simple JSP in Tomcat 6.0.32:
<%
response.setHeader("Last-Modified", "Tue, 15 Nov 1994 12:45:26 GMT");
response.setHeader("X-Test-Header", "12345");
response.setHeader("Connection", "close");
response.setHeader("Content-Location", "http://www.google.com/";);
response.setHeader("Vary", "Content-Length");
response.setHeader("Expires", "Tue, 21 Jun 2011 12:00:00 GMT");
response.setHeader("Cache-Control", "foo");
response.setStatus(304);
%>
Neither Last-Modified nor X-Test-Header come back to my browser, though
I was able to set the Connection, Content-Location, Vary, and Expires
headers.
> Is this correct behaviour or some bug?
Looks like httpd is following the spec while Tomcat is not:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5
Specifically:
"
If the conditional GET used a strong cache validator (see section
13.3.3), the response SHOULD NOT include other entity-headers. Otherwise
(i.e., the conditional GET used a weak validator), the response MUST NOT
include other entity-headers; this prevents inconsistencies between
cached entity-bodies and updated headers.
"
Read that very carefully: basically, no entity-headers other than those
explicitly mentioned in that section (Date, ETag, Content-Location,
Expires, Cache-Control, Vary) "RFC SHOULD" be returned under any
circumstances, and, in most circumstances entity-headers other than
those "RFC MUST NOT" be sent.
If anything, I'd say that Tomcat was out-of-spec by allowing those
additional headers to get through.
- -chris
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