RFR: 8303682: Simplify HttpClient DebugLogger

[Jaikiran Pai]

On Tue, 7 Mar 2023 10:16:24 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

> The HttpClient internal DebugLogger could be simplified if its configuration was held in a record. Some of the methods in Utils that return a debug logger could also be simplified/removed. The system property that configures the debug logging could be extended to choose between System.err, System.out, System.Logger, or any of these configurations.
> Passing -Djdk.internal.httpclient.debug=true still works as before.

src/java.net.http/share/classes/jdk/internal/net/http/common/DebugLogger.java line 70:

> 68:         // true if at least on of the three levels is not Level.OFF
> 69:         public boolean on() {
> 70:             return minSeverity() <= Level.OFF.getSeverity();

I suspect this should instead be `return minSeverity() < Level.OFF.getSeverity();` i.e. if min severity if `OFF` then on() shouldn't return `true`.

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PR: https://git.openjdk.org/jdk/pull/12900