ApiException.getMessage throws NullPointerException when IOException occurs

[jlorenzen]

Describe the bug
I'm noticing a NullPointerException when an IO error happens and I attempt to call the ApiException.getMessage method.

To reproduce
Trigger an IOException when using the java sdk. I'm triggering this using mock-server's withDropConnection feature.

Expected behavior
I should not see an NPE.

SDK version
13.0.0

Language version, developer tools
Java 17

OS/platform
M1 Mac

Additional context
I believe the issue is because when an IO errors happens, the headers are null and this line in ApiException is what throws the NPE.

    public String getMessage() {
        return String.format("Message: %s%nHTTP response code: %s%nHTTP response body: %s%nHTTP response headers: %s",
                super.getMessage(), this.getCode(), this.getResponseBody(), this.getResponseHeaders().toString());
    }

[louis-launchdarkly]

Hello @jlorenzen, thank you for reporting this issue. We will look into this and get back to you.

Filed internally as 213590.

[github-actions]

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