How do I set SSL protocol version in java? And how do I know which one? javax.net.ssl.SSLException: Received fatal alert: protocol_version

Question

I am using Apache HttpClient 4.3 to interact with the API of hubic.com. My minimal reproducable example is just a one liner:

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Answer 1

HttpClient can take an SSLContext for its SSLConnectionSocketFactory.

You can set the appropriate TLS version in the properties for the SSLContext with the getInstance static method.

Something like SSLContext context = SSLContext.getInstance("TLSv1");

If you need to force just one protocol (as getInstance can return one that supports multiple protocols), you can use the setEnabledProtocols method (which takes a String[]) on the context you retrieved using getInstance.