
Update `JarUrlConnection` and `NestedUrlConnection` so that calls to `getLastModified()` and `getHeaderFieldDate("last-modified", 0)` always return a result. Fixes gh-38204
Update `JarUrlConnection` and `NestedUrlConnection` so that calls to `getLastModified()` and `getHeaderFieldDate("last-modified", 0)` always return a result. Fixes gh-38204