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  1. Undertow
  2. UNDERTOW-451

Undertow mod_cluster proxy sometimes sends stray bytes to UDP multicast address

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    • Icon: Bug Bug
    • Resolution: Won't Do
    • Icon: Minor Minor
    • None
    • 1.2.6.Final, 1.3.0.Beta1
    • Proxy
    • None

      This is merely an observation of a weird behaviour rather than a functional bug per se. Workers listening to proxy advertisements simply ignore the byte gibberish, so there is no disruption of service. On the other hand, Apache HTTP Server advertisements has never, to my best knowledge, produced anything like this on Linux ~ 3.19.5 OS. The following log was produced with famous ancient test utility Advertize.java.

      received: HTTP/1.0 200 OK
      Date: Wed, 27 May 2015 10:35:56 +0200
      Sequence: 110
      Digest: 604853358c75ba2c2a89832d1d371de1
      Server: 7e2370c8-7fcf-4df9-9baf-e2302142bf1a
      X-Manager-Address: karm.brq.redhat.com:8081
      X-Manager-Url: /
      X-Manager-Protocol: http
      X-Manager-Host: karm.brq.redhat.com
      received from /10.40.4.50:65530
      
      received:  ����������s۩�
      received from /10.40.4.50:65530
      
      received: HTTP/1.0 200 OK
      Date: Wed, 27 May 2015 10:36:06 +0200
      Sequence: 111
      Digest: 2efdfa8aa413a4168a110aab97febb83
      Server: 7e2370c8-7fcf-4df9-9baf-e2302142bf1a
      X-Manager-Address: karm.brq.redhat.com:8081
      X-Manager-Url: /
      X-Manager-Protocol: http
      X-Manager-Host: karm.brq.redhat.com
      received from /10.40.4.50:65530
      
      received: HTTP/1.0 200 OK
      Date: Wed, 27 May 2015 10:36:16 +0200
      Sequence: 112
      Digest: c8b8f3e955d15c14eacbd6db1d800422
      Server: 7e2370c8-7fcf-4df9-9baf-e2302142bf1a
      X-Manager-Address: karm.brq.redhat.com:8081
      X-Manager-Url: /
      X-Manager-Protocol: http
      X-Manager-Host: karm.brq.redhat.com
      received from /10.40.4.50:65530
      
      received:  ���]���������9
      received from /10.40.4.50:65530
      
      received: HTTP/1.0 200 OK
      Date: Wed, 27 May 2015 10:36:26 +0200
      Sequence: 113
      Digest: f1c9e924a0cad62456f5599861bca7a3
      Server: 7e2370c8-7fcf-4df9-9baf-e2302142bf1a
      X-Manager-Address: karm.brq.redhat.com:8081
      X-Manager-Url: /
      X-Manager-Protocol: http
      X-Manager-Host: karm.brq.redhat.com
      received from /10.40.4.50:65530
      

      Until I found out more about or spot any evil side effects, I shall keep the Priority on Minor.

              sdouglas1@redhat.com Stuart Douglas (Inactive)
              mbabacek1@redhat.com Karm Karm
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                Created:
                Updated:
                Resolved: