diff --git a/data/datasets/testdata+001.nc b/data/datasets/testdata+001.nc
new file mode 100644
index 00000000..e16b3603
Binary files /dev/null and b/data/datasets/testdata+001.nc differ
diff --git a/python/python_fastapi_server/routers/wmswcs.py b/python/python_fastapi_server/routers/wmswcs.py
index c871fec8..b9f7e93f 100644
--- a/python/python_fastapi_server/routers/wmswcs.py
+++ b/python/python_fastapi_server/routers/wmswcs.py
@@ -39,7 +39,9 @@ async def handle_wms(req: Request, ):
         if len(param_parts) == 2 and param_parts[0].upper() == "DATASET":
             query_string += f"&{param_parts[0]}={param_parts[1]}"
         else:
-            query_string += f"&{k}={req.query_params[k]}"
+            query_param=req.query_params[k]
+            query_param = query_param.replace('+', '%2B')
+            query_string += f"&{k}={query_param}"
 
     # Run adaguc-server
     status, data, headers = adaguc_instance.runADAGUCServer(query_string,
diff --git a/tests/AdagucTests/TestWMS.py b/tests/AdagucTests/TestWMS.py
index df029a35..7babe1d2 100644
--- a/tests/AdagucTests/TestWMS.py
+++ b/tests/AdagucTests/TestWMS.py
@@ -101,6 +101,22 @@ def test_WMSGetMap_testdatanc(self):
             data.getvalue(),
             AdagucTestTools().readfromfile(self.expectedoutputsspath +
                                            filename))
+    def test_WMSGetMap_testdatanc_withplus(self):
+        AdagucTestTools().cleanTempDir()
+        filename = "test_WMSGetMap_testdatanc_plus.png"
+        # pylint: disable=unused-variable
+        status, data, headers = AdagucTestTools().runADAGUCServer(
+            "source=testdata%2B001.nc&SERVICE=WMS&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&LAYERS=testdata&WIDTH=256&HEIGHT=256&CRS=EPSG%3A4326&BBOX=30,-30,75,30&STYLES=testdata%2Fnearest&FORMAT=image/png&TRANSPARENT=FALSE&",
+            env=self.env,
+            args=["--report"])
+        AdagucTestTools().writetofile(self.testresultspath + filename,
+                                      data.getvalue())
+        self.assertEqual(status, 0)
+        self.assertEqual(
+            data.getvalue(),
+            AdagucTestTools().readfromfile(self.expectedoutputsspath +
+                                           filename))
+
 
     def test_WMSGetMap_geos(self):
         AdagucTestTools().cleanTempDir()
diff --git a/tests/expectedoutputs/TestWMS/test_WMSGetMap_testdatanc_plus.png b/tests/expectedoutputs/TestWMS/test_WMSGetMap_testdatanc_plus.png
new file mode 100644
index 00000000..a7a3e9c2
Binary files /dev/null and b/tests/expectedoutputs/TestWMS/test_WMSGetMap_testdatanc_plus.png differ