RFR: 7105350: HttpExchange's attributes are the same as HttpContext's attributes [v2]

[Michael McMahon]

On Wed, 8 Oct 2025 02:29:54 GMT, Josiah Noel <duke at openjdk.org> wrote:

>> src/jdk.httpserver/share/classes/sun/net/httpserver/ExchangeImpl.java line 65:
>> 
>>> 63:     private static final boolean perExchangeAttributes =
>>> 64:         !System.getProperty("jdk.httpserver.attributes", "")
>>> 65:               .equals("context");
>> 
>> The property will have to be documented somewhere such as the jdk.httpserver module-info. But, I'm wondering if fairly obscure properties like this might be better off "buried" in the net.properties config file. I think there's a case for putting all such "compatibility" flags somewhere out of the way like that. If we were to do that, you would need to access the property using  `sun.net.NetProperties`. 
>> 
>> Any other views on this?
>
> I can switch to `sun.net.NetProperties` if you so desire.

Yeah, I think we should put the property in `net.properties` something like this:


  # Prior to JDK 26, the HttpExchange attribute map was shared with the enclosing HttpContext.
  # Since JDK 26, by default, exchange attributes are per-exchange and the context attributes must
  # be accessed by calling getHttpContext().getAttributes(). Uncomment this property to
  # restore the pre JDK 26 behavior.
  #
  # jdk.httpserver.attributes=context

Then I think we should add a sentence at the end of the jdk.httpserver module-info to say that additional
system/networking properties may be defined in `net.properties`

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PR Review Comment: https://git.openjdk.org/jdk/pull/27652#discussion_r2413328557