RFR : 8007315 HttpURLConnection.filterHeaderField method returns null where empty string is expected

[Seán Coffey]

8007315 deals with an issue in SAAJ code where a NullPointerException is 
seen.

The SAAJ code makes the assumption that non-null keys obtained from a 
httpURLConnection header will contain non-null values :

294                     key = httpConnection.getHeaderFieldKey(i);
295                     value = httpConnection.getHeaderField(i);  --> 
assumed to be non-null

A behavioural change came into jdk7u4 with the 7095980 fix. With the 
filtering of httpOnly cookies, when cookieHandler is set, the code 
returns null if no other values are present in the values returned for a 
header key. I'm proposing to change that to be an empty string instead ("").

I've added extra scenarios to the original 7095980 unit testcase also to 
cover this scenario.

bug : http://bugs.sun.com/view_bug.do?bug_id=8007315
webrev : http://cr.openjdk.java.net/~coffeys/webrev.8007315.jdk8/

regards,
Sean.


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