Plug-in log reports: WARNING: ESI: esiParseDate: unrecognized date format: 'Fri, Jan 25 2099 23:59:59 GMT'
 Technote (troubleshooting)
 
Problem(Abstract)
The IBM® WebSphere® Application Server plug-in log reports that the date supplied in the If-Modified-Since header field of a request from the client, or the Last-Modified header field of a response from WebSphere Application Server, is in an unrecognizable date format.
 
Cause
The application does not use the Requests for Comments (RFC) compliant date formats when setting values for the following header fields:
  • If-Modifed-Since
  • Last-Modified
 
Resolving the problem
The unrecognized date format warning could be logged when processing the request from the client and also a response from the WebSphere Application Server.
The general recommendation is to revise the custom application so that it uses an RFC compliant format in the header fields Last-Modified and If-Modified-Since.

Below are the 3 RFC compliant formats:
  • Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
  • Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
  • Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
 
 
Cross Reference information
Segment Product Component Platform Version Edition
Application Servers Runtimes for Java Technology Java SDK
 
 


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > Plug-in
Operating system(s): Windows
Software version: 6.1
Software edition:
Reference #: 1252155
IBM Group: Software Group
Modified date: Sep 3, 2007