Force TLS > 1.0 on AppEngine local development server in Java

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慢半拍i
慢半拍i 2021-01-18 10:03

we need to connect to an external service using at least TLS 1.1, which doesn\'t work on the local development server using the Java SDK v. 1.9.32. Is there a way to force t

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  • 2021-01-18 10:36

    Adding to the above answer, since TLS 1.1 and 1.2 are disabled by default on JDK 7, if you don't want to use JDK 8 you can also try modifying the last line of dev_appserver.sh with the following flags:

    exec "${RUN_JAVA}" "${SCRIPT_NAME}" \
        -Ddeployment.security.TLSv1.1=true -Ddeployment.security.TLSv1.2=true -ea -cp "${JAR_FILE}" \
        com.google.appengine.tools.KickStart \
        com.google.appengine.tools.development.DevAppServerMain "$@"
    

    Or dev_appserver.cmd on Windows:

    java -Ddeployment.security.TLSv1.1=true -Ddeployment.security.TLSv1.2=true -cp "%~dp0\..\lib\appengine-tools-api.jar" ^
        com.google.appengine.tools.KickStart ^
        com.google.appengine.tools.development.DevAppServerMain %*
    
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  • 2021-01-18 10:53

    My local Appengine development server started to use TLS 1.2 once I installed JDK 8 (before I was using JDK 7). JDK 8 uses TLS 1.2 by default.

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