diff --git a/src/service/service/tools/OpticalTools.py b/src/service/service/tools/OpticalTools.py
index ad2f8cbeca0edbb6511c1b0ee1aec70183a806ca..1837bf688c3ab4f61d49c4f481928896a6f4dbd7 100644
--- a/src/service/service/tools/OpticalTools.py
+++ b/src/service/service/tools/OpticalTools.py
@@ -109,11 +109,11 @@ def add_lightpath(src, dst, bitrate, bidir, ob_band) -> str:
         if ob_band is None:
             if bidir is None:
                 bidir = 1
-            urlx = "{:s}/AddFlexLightpath/{:s}/{:s}/{:s}/{:s}".format(base_url, src, dst, bitrate, bidir)
+            urlx = "{:s}/AddFlexLightpath/{:s}/{:s}/{:s}/{:s}".format(base_url, src, dst, str(bitrate), str(bidir))
         else:
             if bidir is None:
                 bidir = 1
-            urlx = "{:s}/AddFlexLightpath/{:s}/{:s}/{:s}/{:s}/{:s}".format(base_url, src, dst, bitrate, bidir, ob_band)
+            urlx = "{:s}/AddFlexLightpath/{:s}/{:s}/{:s}/{:s}/{:s}".format(base_url, src, dst, str(bitrate), str(bidir), str(ob_band))
         r = requests.put(urlx, headers=headers)
         reply = r.text 
         return reply
@@ -127,7 +127,7 @@ def add_lightpath(src, dst, bitrate, bidir, ob_band) -> str:
 def get_optical_band(idx) -> str:
     if not TESTING:
         base_url = get_optical_controller_base_url()
-        urlx = "{:s}/GetOpticalBand/{:s}".format(base_url, idx)
+        urlx = "{:s}/GetOpticalBand/{:s}".format(base_url, str(idx))
         headers = {"Content-Type": "application/json"}
         r = requests.get(urlx, headers=headers)
         reply = r.text 
@@ -143,7 +143,7 @@ def delete_lightpath(flow_id, src, dst, bitrate) -> str:
     reply = "200"
     if not TESTING:
         base_url = get_optical_controller_base_url()
-        urlx = "{:s}/DelLightpath/{:s}/{:s}/{:s}/{:s}".format(base_url, flow_id, src, dst, bitrate)
+        urlx = "{:s}/DelLightpath/{:s}/{:s}/{:s}/{:s}".format(base_url, str(flow_id), src, dst, str(bitrate))
 
         headers = {"Content-Type": "application/json"}
         r = requests.delete(urlx, headers=headers)