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WebRequest with Content-Type: application/x-www-form-urlencoded returns 403 Forbidden error

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Hi all!


I use the following code :

   int lastErrorTemp = -1;
   string headers,result_headers; 
   char post[],result[]; 
   string url = urlPar; //-- Valid URL

   string payload= "parameterA=testA&parameterB=testB";  //-- Valid Parameters    
   StringToCharArray(payload,post,0,WHOLE_ARRAY,CP_UTF8);
   headers = "Content-Type: application/x-www-form-urlencoded\r\n";      
   //--- Reset the last error code 
   ResetLastError(); 
   int timeout=5000; 
   //--
   int res=WebRequest("POST",url,headers,timeout,post,result,result_headers); 
   if(res==-1){ 
      int errorTemp = GetLastError();
      Print("Error : "+(string)errorTemp); 
      return; 
   }
   ///-- convert from char to string
   string strTemp = "";
   for(int i = 0; i < ArraySize(result); i++){
      strTemp += CharToString(result[i]);
   }
   
   Print("---------------------------------------");
   string resultStr = "url : "+url+" - ";
   resultStr += "\n Result : "+strTemp;
   resultStr += "\n Headers : "+result_headers;
   Print(resultStr);
   Print("---------------------------------------");


   

And for some reason it returns 403 Forbidden error.

If i use other programming language like python or the postman it works properly. So it doesn't a server-side issue.

Last, when i leave the char array post empty then it returns 200 OK.

Any help will be appreciated!

Thanks.




urlPar; //-- Valid URL

Is not a valid url.

Remember you can only use post 80 for HTTP and 443 for HTTPS.

And the link has to be added to the list of allowed url's in the settings.

Marco vd Heijden:

Is not a valid url.

Remember you can only use post 80 for HTTP and 443 for HTTPS.

And the link has to be added to the list of allowed url's in the settings.

Thanks for the reply.

I wrote in comment 'valid url' because i successfully completed the request with WebRequest function but i had to remove the line 'StringToCharArray(payload,post,0,WHOLE_ARRAY,CP_UTF8);'.

Which means that i left the char array post empty. So when i fill that array i have the 403 Forbidden error. 

D3nn1s:

Thanks for the reply.

I wrote in comment 'valid url' because i successfully completed the request with WebRequest function but i had to remove the line 'StringToCharArray(payload,post,0,WHOLE_ARRAY,CP_UTF8);'.

Which means that i left the char array post empty. So when i fill that array i have the 403 Forbidden error. 

Try

StringToCharArray(payload,post,0,StringLen(payload),CP_UTF8);
Alain Verleyen:

Try

Thank you Alain!

That was the problem. 
Do you know why the change from WHOLE_ARRAY to StringLen(payload) solve that issue ?

Regards!

D3nn1s:

Thank you Alain!

That was the problem. 
Do you know why the change from WHOLE_ARRAY to StringLen(payload) solve that issue ?

Regards!

Because string in mql are terminated by '\0' and you using WHOLE_ARRAY you get a 0 at the end of your array. The server don't like it.
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