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  1. Jenkins
  2. JENKINS-53131

"ALPN callback dropped" log line

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Minor
    • Resolution: Won't Fix
    • Component/s: github-api-plugin
    • Labels:
      None
    • Environment:
      Jenkins 2.135
      blueocean plugin: 1.7.1
    • Similar Issues:

      Description

      I'm getting the following couple of lines quite a lot in my running Jenkins log

      Aug 20, 2018 10:32:29 AM INFO com.squareup.okhttp.internal.Platform$JdkWithJettyBootPlatform getSelectedProtocolALPN callback dropped: SPDY and HTTP/2 are disabled. Is alpn-boot on the boot class path? Aug 20, 2018 10:32:40 AM INFO com.squareup.okhttp.internal.Platform$JdkWithJettyBootPlatform getSelectedProtocolALPN callback dropped: SPDY and HTTP/2 are disabled. Is alpn-boot on the boot class path?

      Any ideas what does that line trying to say?

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          allan_burdajewicz Allan BURDAJEWICZ added a comment -

          This message is logged by the okhttp library when an HTTP connection is made to an HTTP server that supports HTTP 2 but the platform on which okhttp is running on does not support ALPN.

          Jenkins currently supports JDK 8. ALPN has been added in JDK 9. So ALPN is not currently supported in Jenkins. Hence the warning.

          Some plugins - like for example GitHub API - uses okhttp library and GitHub supports HTTP2. So you might see these INFO messages.

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          allan_burdajewicz Allan BURDAJEWICZ added a comment - This message is logged by the okhttp library when an HTTP connection is made to an HTTP server that supports HTTP 2 but the platform on which okhttp is running on does not support ALPN . Jenkins currently supports JDK 8. ALPN has been added in JDK 9. So ALPN is not currently supported in Jenkins. Hence the warning. Some plugins - like for example GitHub API - uses okhttp library and GitHub supports HTTP2. So you might see these INFO messages.
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          bitwiseman Liam Newman added a comment -

          This is not a issue that can be fixed in our code.

          Show
          bitwiseman Liam Newman added a comment - This is not a issue that can be fixed in our code.

            People

            Assignee:
            Unassigned Unassigned
            Reporter:
            eslam Eslam ElHusseiny
            Votes:
            3 Vote for this issue
            Watchers:
            9 Start watching this issue

              Dates

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              Updated:
              Resolved: