What is the expected behavior?

common.isJSONContent('application/json; charset=utf-8') === true

What is the actual behavior?

common.isJSONContent('application/json; charset=utf-8') === false

Possible solution
Change implementation to:

return contentType.startsWith('application/json');
// or contentType.indexOf('application/json') === 0

How to reproduce the issue
Use the recorder to capture a request using an HTTP client that uses the charset directive in the Content-Type header. E.g., ms-rest

Does the bug have a test case?

Runkit

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