If the body is a string, Axios will add a double quotation mark to it.

Describe the bug

A clear and concise description of what the bug is. If your problem is not a bug, please file under Support or Usage Question

If the body is a string, Axios will add a double quotation mark to it.

To Reproduce

Code snippet to reproduce, ideally that will work by pasting into something like https://npm.runkit.com/axios, a hosted solution, or a repository that illustrates the issue. If your problem is not reproducible, please file under Support or Usage Question

axios({
    url: 'http://10.23.7.12:9090/api/service',
    headers: {
        'Content-Type': 'application/json'
    },
    method: 'post',
    data: 'ggg'
})

The content received by the backend is "\" ggg \ ""

Expected behavior

A clear and concise description of what you expected to happen.

Environment

• Axios Version [e.g. 0.18.0] 0.21.4
• Adapter [e.g. XHR/HTTP] XHR
• Browser [e.g. Chrome, Safari] Chrome
• Browser Version [e.g. 22] 93.0.4577.63
• Node.js Version [e.g. 13.0.1] v16.7.0
• OS: [e.g. iOS 12.1.0, OSX 10.13.4] macOS Big Sur 11.2.3
• Additional Library Versions [e.g. React 16.7, React Native 0.58.0]

Additional context/Screenshots

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