git: openjdk/jdk17u-dev: 8288109: HttpExchangeImpl.setAttribute does not allow null value after JDK-8266897

[Goetz Lindenmaier]

Changeset: 35dbfb2b
Branch: master
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2025-10-08 06:55:10 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/35dbfb2bbe62030eb773fee5800d3b820b2a4b54

8288109: HttpExchangeImpl.setAttribute does not allow null value after JDK-8266897

Backport-of: f9827ad17205ad1cec21bf76f8553f415439b38b

! src/jdk.httpserver/share/classes/sun/net/httpserver/ExchangeImpl.java
+ test/jdk/com/sun/net/httpserver/ExchangeAttributeTest.java