SpringBoot org.springframework.web.reactive.function.client.WebClientRequestException: Unexpected handshake message: certificate

Hello, when trying out the webclient of webflux calling a third-party service, there was an exception with the handshake certificate. Have you ever seen a similar scenario。

org.springframework.web.reactive.function.client.WebClientRequestException: Unexpected handshake message: certificate
    at org.springframework.web.reactive.function.client.ExchangeFunctions$DefaultExchangeFunction.lambda$wrapException$9(ExchangeFunctions.java:136) ~[spring-webflux-6.0.4.jar!/:6.0.4]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    *__checkpoint ⇢ Request to POST https://buy.itunes.apple.com/verifyReceipt [DefaultWebClient]
Original Stack Trace:
        at org.springframework.web.reactive.function.client.ExchangeFunctions$DefaultExchangeFunction.lambda$wrapException$9(ExchangeFunctions.java:136) ~[spring-webflux-6.0.4.jar!/:6.0.4]
        at reactor.core.publisher.MonoErrorSupplied.subscribe(MonoErrorSupplied.java:55) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.Mono.subscribe(Mono.java:4444) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:103) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.FluxPeek$PeekSubscriber.onError(FluxPeek.java:222) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.FluxPeek$PeekSubscriber.onError(FluxPeek.java:222) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.FluxPeek$PeekSubscriber.onError(FluxPeek.java:222) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.MonoNext$NextSubscriber.onError(MonoNext.java:93) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onError(MonoFlatMapMany.java:204) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.SerializedSubscriber.onError(SerializedSubscriber.java:124) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.FluxRetryWhen$RetryWhenMainSubscriber.whenError(FluxRetryWhen.java:225) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.FluxRetryWhen$RetryWhenOtherSubscriber.onError(FluxRetryWhen.java:274) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onError(FluxContextWrite.java:121) ~[reactor-core-3.5.2.jar!/:3.5.2]
        at reactor.core.publisher.FluxConcatMapNoPrefetch$FluxConcatMapNoPrefetchSubscriber.maybeOnError(FluxConcatMapNoPrefetch.java:326) ~[reactor-core-3.5.2.jar!/:3.5.2]

Comment From: wilkinsona

To debug SSL problem on the JVM, I would recommend running your application with -Djavax.net.debug=ssl,handshake or similar.

If you have any further questions, please follow up on Stack Overflow or Gitter. As mentioned in the guidelines for contributing, we prefer to use GitHub issues only for bugs and enhancements.

Comment From: bclozel

Duplicates https://github.com/spring-projects/spring-framework/issues/31287

Please avoid cross posting.