score:0

keep the ref of webview and initially don't load any url

<webview autosize={true} ref={(input) => { this.webview = input; }} src="data:text/plain" />

in your componentdidupdate() load url with extra headers

if (this.webview) {
  this.webview.loadurl(url, {
    extraheaders: ""
  });
}

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