SpFxFlowEmailWebPart sendEmailViaOffice365Outlook method

SpFxFlowEmailWebPart.ts

private sendEmailViaOffice365Outlook(emailaddress: string, emailSubject: string, emailBody: string): Promise<HttpClientResponse> {

    const postURL = this.properties.flowURL;

    const body: string = JSON.stringify({
      'emailaddress': emailaddress,
      'emailSubject': emailSubject,
      'emailBody': emailBody,
    });

    const requestHeaders: Headers = new Headers();
    requestHeaders.append('Content-type', 'application/json');

    const httpClientOptions: IHttpClientOptions = {
      body: body,
      headers: requestHeaders
    };

    console.log("Sending Email");

    return this.context.httpClient.post(
      postURL,
      HttpClient.configurations.v1,
      httpClientOptions)
      .then((response: Response): Promise<HttpClientResponse> => {
        console.log("Email sent.");
        return response.json();
      });
  }