RFR: 8301964: Expensive fillInStackTrace operation in HttpURLConnection.getLastModified when no last-modified in response [v3]

[Andrey Turbanov]

On Wed, 8 Feb 2023 14:15:09 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

>> [JDK-8297211](https://bugs.openjdk.org/browse/JDK-8297211) (#11258) missed one case with date headers: `last-modified`, `date`, `expires`. We can avoid expensive NPE.
>
> Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8301964: Expensive fillInStackTrace operation in HttpURLConnection.getLastModified when no last-modified in response
>   
>   update copyright year

Javadoc of the `Date.parse` method does not mention which exceptions could be thrown. That's why I decided to be on the safe side and do not change exception type.

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PR: https://git.openjdk.org/jdk/pull/12451