--- a
+++ b/functions/adminfunc/plugin_urlreadwrite.m
@@ -0,0 +1,99 @@
+function [urlConnection,errorid,errormsg] = plugin_urlreadwrite(fcn,urlChar)
+%URLREADWRITE A helper function for URLREAD and URLWRITE.
+
+%   Adapted by A. Delorme from 
+%   Matthew J. Simoneau, June 2005
+%   Copyright 1984-2011 The MathWorks, Inc.
+%   $Revision: 1.1.6.7 $ $Date: 2011/10/22 22:05:21 $
+
+% Default output arguments.
+urlConnection = [];
+errorid = '';
+errormsg = '';
+
+% Determine the protocol (before the ":").
+protocol = urlChar(1:min(find(urlChar==':'))-1);
+
+% Try to use the native handler, not the ice.* classes.
+switch protocol
+    case 'http'
+        try
+            handler = sun.net.www.protocol.http.Handler;
+        catch exception %#ok
+            handler = [];
+        end
+    case 'https'
+        try
+            handler = sun.net.www.protocol.https.Handler;
+        catch exception %#ok
+            handler = [];
+        end
+    otherwise
+        handler = [];
+end
+
+%Try to fix proxy
+useNewProxyInfo = 0;
+try
+    if exist('OCTAVE_VERSION', 'builtin') == 0
+        [matlabversion matlabdate] = version;
+        matlabversion2 = regexp(matlabversion,'R20(\d\d)([abcd])','match');
+        if ~isempty(matlabversion2)
+            matlabyear = regexp(matlabversion2,'20(\d\d)','match');
+            if ~isempty(matlabyear)
+                matlabyear = str2double(matlabyear{1,1});
+                %matlabsubversion = regexp(matlabversion2,strcat(num2str(matlabyear), "([abcd])"),'match','once');
+                useNewProxyInfo = matlabyear>=2018;
+            end
+        end
+    end
+catch
+    warning('An error occurred when checking MATLAB/Octave version');
+end
+
+try
+    if useNewProxyInfo == 1
+        s = settings;
+        proxyHost = s.matlab.web.ProxyHost.ActiveValue;
+        proxyPort = s.matlab.web.ProxyPort.ActiveValue;
+        switch protocol
+            case 'http'
+                java.lang.System.setProperty('http.proxyHost',proxyHost);
+                java.lang.System.setProperty('http.proxyPort',proxyPort);
+            case 'https'
+                s = settings;
+                proxyHost = s.matlab.web.ProxyHost.ActiveValue;
+                proxyPort = s.matlab.web.ProxyPort.ActiveValue;
+                java.lang.System.setProperty('https.proxyHost',proxyHost);
+                java.lang.System.setProperty('https.proxyPort',proxyPort);
+            otherwise
+                warning('Unknown web protocol');
+        end
+    end
+catch
+    warning('An error occurred when checking proxy information using new format');
+end
+
+% Create the URL object.
+try
+    if isempty(handler)
+        url = java.net.URL(urlChar);
+        % url = javaObject('java.net.URL', urlChar); % Octave
+    else
+        url = java.net.URL([],urlChar,handler);
+        % url = javaObject('java.net.URL', [],urlChar,handler); % Octave
+    end
+catch exception %#ok
+    errorid = ['MATLAB:' fcn ':InvalidUrl'];
+    errormsg = 'Either this URL could not be parsed or the protocol is not supported.';
+    return
+end
+
+% Open a connection to the URL.
+urlConnection = url.openConnection;
+
+% build up the MATLAB User Agent
+mlUserAgent = ['MATLAB R' version('-release') ' '  version('-description')];
+
+% set User-Agent
+urlConnection.setRequestProperty('User-Agent', mlUserAgent);