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https://issues.apache.org/jira/browse/FLINK-40088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-40088:
-----------------------------------
Labels: pull-request-available (was: )
> RestClientITCase.testHttpsConnectionWithDefaultCerts is flaky due to GitHub
> rate limiting (HTTP 429)
> ----------------------------------------------------------------------------------------------------
>
> Key: FLINK-40088
> URL: https://issues.apache.org/jira/browse/FLINK-40088
> Project: Flink
> Issue Type: Bug
> Components: Runtime / REST
> Reporter: Martijn Visser
> Priority: Major
> Labels: pull-request-available
>
> RestClientITCase#testHttpsConnectionWithDefaultCerts
> (flink-end-to-end-tests-restclient) verifies that RestClient completes a TLS
> handshake against a public CA-signed endpoint using the default JDK
> truststore. It does so by fetching a JSON file from raw.githubusercontent.com
> and requiring the response to be valid JSON.
> On GitHub Actions the runners share egress IPs, so GitHub periodically
> returns "429 Too Many Requests" as a plain-text body. RestClient then fails
> with:
> {code:java}
> org.apache.flink.runtime.rest.util.RestClientException: Response was not
> valid JSON, but plain-text: 429: Too Many Requests
> at
> org.apache.flink.runtime.rest.RestClientITCase.testHttpsConnectionWithDefaultCerts(RestClientITCase.java:61)
> {code}
> even though the TLS handshake - the thing under test - succeeded. Example:
> master run [https://github.com/apache/flink/actions/runs/28791132983]
> (2026-07-06, commit 9661ab549b, leg "Default (Java 17) / E2E (group 4)").
> A 429 (or any HTTP error response) is produced in RestClient#readRawResponse
> only after a full HTTP response has been received, i.e. after a successful
> handshake. A genuine certificate/trust failure instead surfaces as an
> SSLException from Netty's SslHandler and never produces a
> RestClientException. The two cases are cleanly distinguishable.
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