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');