RFR: 8355572: Support HTTP Range requests in Simple Web Server [v6]

[Peyang]

On Fri, 31 Oct 2025 12:09:59 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Peyang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add documentation for HTTP range requests support in SimpleFileServer
>
> src/jdk.httpserver/share/classes/sun/net/httpserver/simpleserver/FileServerHandler.java line 310:
> 
>> 308:             return true;
>> 309:         }
>> 310:         servePartialContents(exchange, path, ranges);
> 
> The RFC says:
> 
>> A server that supports range requests MAY ignore or reject a [Range](https://www.rfc-editor.org/rfc/rfc9110.html#field.range) header field that contains an invalid [ranges-specifier](https://www.rfc-editor.org/rfc/rfc9110.html#rule.ranges-specifier) ([Section 14.1.1](https://www.rfc-editor.org/rfc/rfc9110.html#range.specifiers)), a [ranges-specifier](https://www.rfc-editor.org/rfc/rfc9110.html#rule.ranges-specifier) with more than two overlapping ranges, or a set of many small ranges that are not listed in ascending order, since these are indications of either a broken client or a deliberate denial-of-service attack ([Section 17.15](https://www.rfc-editor.org/rfc/rfc9110.html#overlapping.ranges)).
> 
> I would expect a validation of the ranges list before we serve them.

I recall reading this part of the RFC before. 
Since it says *MAY*, and given that this is a simple web server, I wasn't sure if such validations are strictly required,
so I didn't implement them.
But if you think it's necessary, I can add them now.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28021#discussion_r2481541467