Hi there. I'd like to get back to the topic
"Investigate introducing an API on the HttpClient which allows applications to get access to "interim" HTTP responses" -- https://bugs.openjdk.org/browse/JDK-8294196 To avoid confusion: the *bugs* with respect to handling 1xx responses have been thankfully fixed (see https://github.com/openjdk/jdk/pull/10229 and https://github.com/openjdk/jdk/pull/10169). What's still missing is a way to actually inspect the contents of the 1xx messages while waiting for a final response (status >= 200). That could be a callback that provides the status code and the response header fiels when 1xx messages are received. This would be useful when processing 103 messages (Early Hints - RFC 8297) or 104 messages (Upload Resumption Supported - used for "draft-ietf-httpbis-resumable-upload"). Use cases are summarized over here: https://github.com/greenbytes/java-http-1xx-tests (tests live here as well). Let me know if more information is needed. Best regards, Julian
