Improved: Change 'restMethod' by '_method' in request parameters

(OFBIZ-11332)

When we analyse a request method, we currently check the parameter "restMethod".
Mathieu Lirzin propose [1] to use "_method" instead to use a parameter name more generic

I create a new function UtilHttp.getRequestMethod() to centralize the request method resolution.

[1] https://issues.apache.org/jira/browse/OFBIZ-11007?focusedCommentId=17012712&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17012712

framework/base/src/main/java/org/apache/ofbiz/base/util/UtilHttp.java

@@ -695,6 +695,17 @@ public static String getFullRequestUrl(HttpServletRequest request) {
         return requestUrl.toString();
     }
 
+    /** Resolve the method send with the request.
+     *  check first the parameter _method before return the request method
+     * @param request
+     * @return
+     */
+    public static String getRequestMethod(HttpServletRequest request) {
+        return request.getParameter("_method") != null ?
+                request.getParameter("_method") :
+                request.getMethod();
+    }
+
     public static Locale getLocale(HttpServletRequest request, HttpSession session, Object appDefaultLocale) {
         // check session first, should override all if anything set there
         Object localeObject = session != null ? session.getAttribute("locale") : null;

framework/webapp/src/main/java/org/apache/ofbiz/webapp/control/RequestHandler.java

@@ -260,8 +260,7 @@ public void doRequest(HttpServletRequest request, HttpServletResponse response,
         // The "overriddenView" attribute is set by resolveURI when necessary.
         String overrideViewUri = (String) request.getAttribute("overriddenView");
 
-        String restMethod = request.getParameter("restMethod");
-        String method = (restMethod != null) ? restMethod : request.getMethod();
+        String method = UtilHttp.getRequestMethod(request);
         RequestMap requestMap = resolveMethod(method, rmaps).orElseThrow(() -> {
             String msg = UtilProperties.getMessage("WebappUiLabels", "RequestMethodNotMatchConfig",
                     UtilMisc.toList(requestUri, method), UtilHttp.getLocale(request));