IBM Support

PH30071: CONFLICT BETWEEN MOD_DEFLATE AND THE WAS PLUGIN

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APAR status

  • Closed as program error.

Error description

  • Websockets connections through the WAS Plug-in may fail with
    the following message in the browsers developer console:
    
    "A
    server must not mask any frames that it sends to the client."
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server web        *
    *                  server plugin users with websockets         *
    *                  applications                                *
    ****************************************************************
    * PROBLEM DESCRIPTION: Websocket requests will fail when the   *
    *                      web server is configured with           *
    *                      mod_deflate for all conten-types.       *
    ****************************************************************
    * RECOMMENDATION:  Problem can be address with web server      *
    *                  configuration. Modify the webserver         *
    *                  configuration, add:                         *
    *                  SetEnvIfNoCase Upgrade .+ no-gzip           *
    *                  after the deflate output filter statement.  *
    ****************************************************************
    The web server plugin does not support the use of mod_deflate
    with websocket traffic.
    

Problem conclusion

  • Code has been corrected so that websocket connections disable
    web server compression.
    
    The fix for this APAR is targeted for inclusion in fix pack
    8.5.5.19 and 9.0.5.7. For more information, see 'Recommended
    Updates for WebSphere Application Server':
    https://www.ibm.com/support/pages/node/715553
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH30071

  • Reported component name

    IBM HTTP SERVER

  • Reported component ID

    5724J0801

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-09-30

  • Closed date

    2020-10-07

  • Last modified date

    2020-10-07

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    WEBSPHERE APP S

  • Fixed component ID

    5724J0800

Applicable component levels

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850"}]

Document Information

Modified date:
08 October 2020