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https://issues.apache.org/jira/browse/HTTPCLIENT-896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12841541#action_12841541
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Jörgen Rydenius commented on HTTPCLIENT-896:
--------------------------------------------

Oleg, you are correct that the Netscape Draft specification 
(http://curl.haxx.se/rfc/cookie_spec.html) specifies clearly that the date 
format is "Wdy, DD-Mon-YYYY HH:MM:SS GMT". But on the other hand, in the 
examples section of the same document, the only example header that contains 
"Expires" is the following:

Set-Cookie: CUSTOMER=WILE_E_COYOTE; path=/; expires=Wednesday, 09-Nov-99 
23:12:40 GMT

Note that the weekday is fully spelled out and that the year is written as two 
digits only. I would say that the specification therefore makes the 2 or 4 
digit year optional. I think NetscapeDraftSpec should reflect this. An example 
of a product that uses the 2 digit version is jetty. When using httpclient 4 
talking to a jetty server, any Set-Cookie headers for persistent cookies will 
be interpreted as a 4 digit year in the date and the cookie will immediately be 
disregarded as expired by some 2,000 years or so. Httpclient 3 on the other 
hand had no problem understanding the persistent cookies from jetty. I filed a 
bug report https://bugs.eclipse.org/bugs/show_bug.cgi?id=304698 on jetty to 
change their date format, but on the other hand I also think httpclient 4 is 
too strict about the date format when even the original specification uses two 
alternatives.

Workaround is easy by setting CookieSpecPNames.DATE_PATTERNS, but I really 
think that products like jetty and httpclient should be compatible by default. 
Also, since the date format used by jetty is parsable but misinterpreted and 
disregarded by httpclient makes it especially hard to detect the first time on 
encounters the problem.

> CLONE -Parsing expires
> ----------------------
>
>                 Key: HTTPCLIENT-896
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-896
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpCookie
>            Reporter: Fuad Efendi
>
> Seeing this very often:
>  Invalid cookie header: "Set-Cookie: _asid=011e7014f5e7718e02d893335aa5a16e; 
> path=/; expires=Wed, 16 May 2018 17:13:32 GMT". Unable to parse expires 
> attribute: Wed, 16 May 2018 17:13:32 GMT

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