Use switch expressions in jdk.internal.net.http and java.net.http

[Kartik Ohri]

Hi!
I would like to submit this patch https://github.com/openjdk/jdk/pull/1364
with the rationale to improve the readability of the code. Can someone
please take a look at it and create a public issue if the patch is OK to be
included ?
Thanks,
Kartik