sap1.inputHttpHeaders_x = new Map<String, String>();

           //Setting a basic authentication header

           String username = 'SFDCUSER';
           String password = 'xxxxxxc1';
           Blob headerValue = Blob.valueOf(username + ':' + password);
           String authorizationHeader = 'BASIC ' +EncodingUtil.base64Encode(headerValue);
           sap1.inputHttpHeaders_x.put('Authorization',authorizationHeader);