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https://issues.apache.org/jira/browse/GROOVY-12287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18106917#comment-18106917
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ASF GitHub Bot commented on GROOVY-12287:
-----------------------------------------
testlens-app[bot] commented on PR #2824:
URL: https://github.com/apache/groovy/pull/2824#issuecomment-5380845436
## ✅ All tests passed ✅
🏷️ Commit: c29289a16eaa199f845f90893e809ebcd5d07c5d
▶️ Tests: 111692 executed
⚪️ Checks: 31/31 completed
---
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> HttpBuilder: retry once on a stale keep-alive connection
> --------------------------------------------------------
>
> Key: GROOVY-12287
> URL: https://issues.apache.org/jira/browse/GROOVY-12287
> Project: Groovy
> Issue Type: Bug
> Reporter: Daniel Sun
> Priority: Major
>
> HttpBuilder follows redirects itself whenever {{followRedirects}} is enabled.
> The next hop goes through the same JDK {{HttpClient}} and may reuse a
> keep-alive connection the peer has already closed.
> JDK {{HttpClient}} retries that failure for GET/HEAD, but not for
> PUT/POST/PATCH. A same-origin 301 of a PUT then fails intermittently:
> {noformat}
> java.lang.RuntimeException: I/O error during HTTP request PUT
> http://127.0.0.1:.../api/put-dst
> Caused by: java.io.IOException: HTTP/1.1 header parser received no bytes
> Caused by: java.io.IOException: Broken pipe
> {noformat}
> Seen on
> {{HttpBuilderTest.confineToBaseUriPreservesNonPostMethodAcrossRedirectOn301}}
> (GROOVY-12182). Redirect following is always manual (GROOVY-12274). GET
> follow-ups do not flake: the JDK client retries them.
> h2. Cause
> A common trigger is {{com.sun.net.httpserver.HttpServer}}:
> {{sendResponseHeaders(status, -1)}} closes the exchange immediately. If the
> request body was never read, that close drops the TCP connection *without*
> sending {{Connection: close}}. The client pools the socket, reuses it for the
> next hop, and PUT is not retried.
> The same class of failure happens against any HTTP/1.1 peer that silently
> drops a keep-alive connection (idle timeout, 3xx of a request with a body,
> etc.).
> h2. Expected
> With {{followRedirects true}}, a PUT that receives 301 should reach the
> {{Location}} target with method and body preserved
> ({{HttpClient.Redirect.NORMAL}}).
> h2. Actual
> The follow-up PUT occasionally throws the I/O error above before any response
> bytes are read.
> h2. Fix
> # Retry *once* in {{HttpBuilder.send}} / {{sendAsync}} when the I/O error
> indicates a stale connection ({{header parser received no bytes}}, broken
> pipe, connection reset). Do not retry timeouts or interrupts.
> # Drain the request body in test {{HttpServer}} redirect handlers *before*
> {{sendResponseHeaders(status, -1)}}, so the mock server does not drop the
> socket without advertising it.
> Regression: {{HttpBuilderStaleConnectionTest}} (peer consumes the request and
> closes with no response; PUT and {{putAsync}} recover on the second
> connection).
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