MQ4 no caching of information from internet directory

Beginner Questions
1

Hello
I have some mq4 software that runs on my windows 7 pc and obtains info from a file in a web directory.
The issue I am having is that once the file is read, the function keeps on returning the same info, even when the file is deleted or changed.
I am assuming that I need to add some kind of no cache code?

Here is my code:

#import "wininet.dll"
   int InternetOpenW(string,int,string,string,int);
   int InternetConnectW(int,string,int,string,string,int,int,int);
   int InternetOpenUrlW(int,string,string,int,int,int);
   int InternetReadFile(int hFile,uchar &sBuffer[],int lNumBytesToRead,int &lNumberOfBytesRead[]);   
   int InternetCloseHandle                 ( int hInet );
#import

string GrabWeb(string strUrl) {//>4
   string result;
   int HttpOpen=InternetOpenW(" ",0," "," ",0);
   int HttpConnect = InternetConnectW(HttpOpen, "", 80, "", "", 3, 0, 1);
   int HttpRequest = InternetOpenUrlW(HttpOpen,strUrl, NULL, 0, 0, 0);
        
   int read[1];
   int sz=0;   
   uchar buffer[1024];
   bool isOk;
   while(true) {
      isOk = InternetReadFile(HttpRequest,buffer,1024,read);
      sz += read[0];
      if(read[0]>0) result=CharArrayToString(buffer,0,read[0],CP_UTF8);
      else break;
   }

   if(HttpRequest>0)InternetCloseHandle(HttpRequest);
   if(HttpConnect>0) InternetCloseHandle(HttpConnect);
   if(HttpOpen>0) InternetCloseHandle(HttpOpen);

   if (sz>0) Print("res",result);return (result);
   // else
   return("");
}

Thank you in advance

Antony