RFR: 8349670: HttpServer: sending interim responses fails after JDK-7026262 [v12]

[eolcoderllc]

On Thu, 9 Oct 2025 14:04:58 GMT, Josiah Noel <duke at openjdk.org> wrote:

>> Following the guideline of the last comment on [JDK-8349670](https://bugs.openjdk.org/browse/JDK-8349670?focusedId=14794649&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14794649), resolves the issue where sending a 1xx status code would close the input stream, preventing the server from reading the body. 
>> 
>> - When a 1xx status code is sent by `sendResponseHeaders`, the input/output streams will not be closed prematurely.
>> - sentHeaders will not be set to true when sending 1xx status codes
>> - 100-continue will be sent automatically when trying to read the inputstream if `Expect: 100-continue` header is present
>
> Josiah Noel has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Update InputRead100Test.java
>  - actually fail if sent twice

The rfc implies that the can send multiple 100 Continue interim responses. A client is supposed to ignore unexpected 1xx codes. A second 190 Continue would be unexpected.

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PR Comment: https://git.openjdk.org/jdk/pull/27069#issuecomment-3386192800