forward incoming error when decoding fails

qiskit_transpiler_service/wrappers/base.py

@@ -180,7 +180,7 @@ def _raise_transpiler_error_and_log(msg: str):
 
 
 def _get_error_msg_from_response(exc: requests.exceptions.HTTPError):
-    if exc.response.status_code == HTTPStatus.UNPROCESSABLE_ENTITY.value:
+    try:
         resp = exc.response.json()
         detail = resp.get("detail")
         # Default message
@@ -194,6 +194,8 @@ def _get_error_msg_from_response(exc: requests.exceptions.HTTPError):
 
             if detail_input and detail_msg:
                 msg = f"Wrong input '{detail_input}'. {detail_msg}"
-    else:
+    except:
+        # If something fails decoding the error
+        # just show the incoming error
         msg = f"Internal error: {str(exc)}"
     return msg

tests/test_transpiler_service.py

@@ -175,26 +175,6 @@ def test_transpile_non_valid_backend():
         )
 
 
-def test_wrong_url():
-    random_circ = random_circuit(5, depth=2, seed=42)
-    transpiler_service = TranspilerService(
-        backend_name="ibm_kyoto",
-        ai="false",
-        optimization_level=3,
-    )
-
-    transpiler_service.transpiler_service.url = "https://cloud-transpiler-experimental.quantum.ibm.com/INVALID"
-
-    try:
-        transpiler_service.run(random_circ)
-        pytest.fail("Error expected")
-    except Exception as e:
-        assert (
-            "Internal error: 404 Client Error: Not Found for url:" in
-            str(e)
-        )
-
-
 def test_transpile_exceed_circuit_size():
     circuit = EfficientSU2(120, entanglement="full", reps=5).decompose()
     transpiler_service = TranspilerService(
@@ -259,8 +239,11 @@ def test_transpile_wrong_url():
         transpiler_service.run(circuit)
         pytest.fail("Error expected")
     except Exception as e:
-        assert "Expecting value: line 1 column 1 (char 0)" in str(e)
-        assert type(e).__name__ == "JSONDecodeError"
+        assert (
+            "Internal error: 404 Client Error: Not Found for url: https://www.ibm.com/transpile"
+            in str(e)
+        )
+        assert type(e).__name__ == "TranspilerError"
 
 
 @pytest.mark.disable_monkeypatch