Done

android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java

         }
         if (source.hasKey("method")) {
           String method = source.getString("method");
-          if (method.equals(HTTP_METHOD_POST)) {
+          if (method.equalsIgnoreCase(HTTP_METHOD_POST)) {
             byte[] postData = null;
             if (source.hasKey("body")) {
               String body = source.getString("body");

js/WebView.ios.js

  * @flow
  */
 
-'use strict';
-
 import React from 'react';
-
-import ReactNative from 'react-native'
 import {
   ActivityIndicator,
   Linking,
   View,
   requireNativeComponent,
   NativeModules,
-  Image
+  Image,
+  findNodeHandle,
 } from 'react-native';
 
 import invariant from 'fbjs/lib/invariant';
   };
 
   state = {
-    viewState: this.props.startInLoadingState ? WebViewState.LOADING : WebViewState.IDLE,
+    viewState: this.props.startInLoadingState
+      ? WebViewState.LOADING
+      : WebViewState.IDLE,
     lastErrorEvent: null,
   };
 
       'about:blank',
       ...(this.props.originWhitelist || []),
     ].map(WebViewShared.originWhitelistToRegex);
-    const onShouldStartLoadWithRequest = (event) => {
+    const onShouldStartLoadWithRequest = event => {
       let shouldStart = true;
       const { url } = event.nativeEvent;
       const origin = WebViewShared.extractOrigin(url);
    * Returns the native `WebView` node.
    */
   getWebViewHandle = () => {
-    return ReactNative.findNodeHandle(this.webViewRef.current);
+    return findNodeHandle(this.webViewRef.current);
   };
 
   _onLoadingStart = (event: WebViewNavigationEvent) => {

js/WebViewShared.js

 
 const WebViewShared = {
   defaultOriginWhitelist: ['http://*', 'https://*'],
-  extractOrigin: (url: string) => {
+  extractOrigin: (url: string): string => {
     const result = /^[A-Za-z0-9]+:(\/\/)?[^/]*/.exec(url);
     return result === null ? '' : result[0];
   },
-  originWhitelistToRegex: (originWhitelist: string) => {
+  originWhitelistToRegex: (originWhitelist: string): string => {
     return escapeStringRegexp(originWhitelist).replace(/\\\*/g, '.*');
   },
 };