SPFX React JS POST REST Call not working - Cannot read property 'post' of undefined

I am trying to authenticate username and password only to a public Authorization.

It is always throwing error - "Cannot read property 'post' of undefined".

I have used

this.context.httpClient.POST( postURL, HttpClient.configurations.v1, httpClientOptions)

Below is the request body and headers

const body: string = JSON.stringify({

'username': value1,

'password': value2,

'options': value3,

});

const requestHeaders: Headers = new Headers();

requestHeaders.append('Content-type', 'application/json');

requestHeaders.append('Accept', 'application/json');

requestHeaders.append('Cache-Control', 'no-cache');

requestHeaders.append('User-Agent', 'PostmanRuntime/7.20.1');

requestHeaders.append('Postman-Token', 'xxxxxxxxxxxxxxxxxxxxxxxxxx');

requestHeaders.append('Host', 'xxxxxx.oktapreview.com');

requestHeaders.append('Accept-Encoding', 'gzip, deflate');

requestHeaders.append('Content-Length', '161');

requestHeaders.append('Cookie', 'xxxxxx=xxxxxxxxxxxxxxxxxxxxx');

requestHeaders.append('Connection', 'keep-alive');

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