https://issues.apache.org/bugzilla/show_bug.cgi?id=54087
Priority: P2
Bug ID: 54087
Assignee: dev@tomcat.apache.org
Summary: HTTP Connector incorrectly throws Exception on Invalid
If-Modified-Since Header
Severity: normal
Classification: Unclassified
OS: Linux
Reporter: gsex...@mhsoftware.com
Hardware: PC
Status: NEW
Version: 6.0.35
Component: Connectors
Product: Tomcat 6
Given this request:
Frame 6: 988 bytes on wire (7904 bits), 988 bytes captured (7904 bits)
Ethernet II, Src: Adtran_16:34:e9 (00:a0:c8:16:34:e9), Dst: Supermic_34:fe:a8
(00:30:48:34:fe:a8)
Internet Protocol Version 4, Src: 198.58.103.28 (198.58.103.28), Dst:
216.17.130.68 (216.17.130.68)
Transmission Control Protocol, Src Port: 37483 (37483), Dst Port: http (80),
Seq: 1449, Ack: 1, Len: 922
[2 Reassembled TCP Segments (2370 bytes): #4(1448), #6(922)]
Hypertext Transfer Protocol
GET /rss/calendar_id/2.xml HTTP/1.1\r\n
Accept:
application/atom+xml,application/rdf+xml,application/rss+xml,application/xml,text/xml,*/*\r\n
Connection: close\r\n
Accept-Encoding: gzip,deflate\r\n
User-Agent: Superfeedr bot/2.0 http://superfeedr.com - Please get in touch
if we are polling too hard.\r\n
X-Superfeedr-Url: http://startupia.mhsoftware.com/rss/calendar_id/2.xml\r\n
If-None-Match: "1351656000000"\r\n
If-Modified-Since: 2012-10-31 04:00:00 +0000\r\n
host: startupia.mhsoftware.com\r\n
ofu.dpn=ffffffffc3a03c0245525d5f4f58455e445a4a4236
\r\n
[Full request URI: http://startupia.mhsoftware.com/rss/calendar_id/2.xml]
~
Tomcat Throws the Exception:
2012-10-31 15:47:15,381 [http-80-46] ERROR
org.apache.catalina.core.ContainerBase.[Catalina].[startupia.mhsoftware.com].[/].[RSSProcessor]-
Servlet.service() for servlet RSSProcessor threw exception
java.lang.IllegalArgumentException: 2012-10-31 04:00:00 +0000
at
org.apache.catalina.connector.Request.getDateHeader(Request.java:1924)
at
org.apache.catalina.connector.RequestFacade.getDateHeader(RequestFacade.java:632)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:619)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at sun.reflect.GeneratedMethodAccessor72.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
This is because the date for the If-Modified-Since Header (2012-10-31 04:00:00
+0000) is not in the format specified by RFC-2616 Section 3.3.1. However, the
RFC states in section 14.25a:
if the passed If-Modified-Since date is invalid, the response is exactly the
same as for a normal GET. A date which is later than the server's current time
is invalid.
Tomcat is not complying with this aspect of the specification because it throws
a 500 rather than processing it as described by the specification.
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