routingpy: MapboxOSRM: CloudFront error when 2 requests follow each other

Here’s what I did

from routingpy.routers import MapboxOSRM
from pprint import pprint

# Some locations in Berlin
coords = [[13.413706, 52.490202], [13.421838, 52.514105],
          [13.453649, 52.507987], [13.401947, 52.543373]]

client = MapboxOSRM(api_key='token')

route = client.directions(locations=coords, profile='walking')
isochrones = client.isochrones(locations=coords[0], profile='walking', intervals=[600, 1200])

pprint((route.geometry, route.duration, route.distance, route.raw))
pprint((isochrones.raw, isochrones[0].geometry, isochrones[0].center, isochrones[0].interval))

---

Here’s what I got

---------------------------------------------------------------------------
JSONDecodeError                           Traceback (most recent call last)
File ~/.virtualenvs/middler-api/lib/python3.8/site-packages/requests/models.py:971, in Response.json(self, **kwargs)
    970 try:
--> 971     return complexjson.loads(self.text, **kwargs)
    972 except JSONDecodeError as e:
    973     # Catch JSON-related errors and raise as requests.JSONDecodeError
    974     # This aliases json.JSONDecodeError and simplejson.JSONDecodeError

File /usr/lib/python3.8/json/__init__.py:357, in loads(s, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    354 if (cls is None and object_hook is None and
    355         parse_int is None and parse_float is None and
    356         parse_constant is None and object_pairs_hook is None and not kw):
--> 357     return _default_decoder.decode(s)
    358 if cls is None:

File /usr/lib/python3.8/json/decoder.py:337, in JSONDecoder.decode(self, s, _w)
    333 """Return the Python representation of ``s`` (a ``str`` instance
    334 containing a JSON document).
    335 
    336 """
--> 337 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    338 end = _w(s, end).end()

File /usr/lib/python3.8/json/decoder.py:355, in JSONDecoder.raw_decode(self, s, idx)
    354 except StopIteration as err:
--> 355     raise JSONDecodeError("Expecting value", s, err.value) from None
    356 return obj, end

JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

JSONDecodeError                           Traceback (most recent call last)
File ~/.virtualenvs/middler-api/src/routingpy/routingpy/client_default.py:235, in Client._get_body(response)
    234 try:
--> 235     body = response.json()
    236 except json.decoder.JSONDecodeError:

File ~/.virtualenvs/middler-api/lib/python3.8/site-packages/requests/models.py:975, in Response.json(self, **kwargs)
    972 except JSONDecodeError as e:
    973     # Catch JSON-related errors and raise as requests.JSONDecodeError
    974     # This aliases json.JSONDecodeError and simplejson.JSONDecodeError
--> 975     raise RequestsJSONDecodeError(e.msg, e.doc, e.pos)

JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

JSONParseError                            Traceback (most recent call last)
Cell In[47], line 2
      1 route = client.directions(locations=coords, profile='walking')
----> 2 isochrones = client.isochrones(locations=coords[0], profile='walking', intervals=[600, 1200])
      3 #matrix = client.matrix(locations=coords, profile='walking')

File ~/.virtualenvs/middler-api/src/routingpy/routingpy/routers/mapbox_osrm.py:413, in MapboxOSRM.isochrones(self, locations, profile, intervals, contours_colors, polygons, denoise, generalize, dry_run)
    408     params["generalize"] = generalize
    410 profile = profile.replace("mapbox/", "")
    412 return self.parse_isochrone_json(
--> 413     self.client._request(
    414         "/isochrone/v1/mapbox/" + profile + "/" + locations_string,
    415         get_params=params,
    416         dry_run=dry_run,
    417     ),
    418     intervals,
    419     locations,
    420 )

File ~/.virtualenvs/middler-api/src/routingpy/routingpy/client_default.py:200, in Client._request(self, url, get_params, post_params, first_request_time, retry_counter, dry_run)
    197     return self._request(url, get_params, post_params, first_request_time, retry_counter + 1)
    199 try:
--> 200     result = self._get_body(response)
    202     return result
    204 except exceptions.RouterApiError:

File ~/.virtualenvs/middler-api/src/routingpy/routingpy/client_default.py:237, in Client._get_body(response)
    235     body = response.json()
    236 except json.decoder.JSONDecodeError:
--> 237     raise exceptions.JSONParseError("Can't decode JSON response:{}".format(response.text))
    239 if status_code == 429:
    240     raise exceptions.OverQueryLimit(status_code, body)

JSONParseError: Can't decode JSON response:<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>ERROR: The request could not be satisfied</TITLE>
</HEAD><BODY>
<H1>403 ERROR</H1>
<H2>The request could not be satisfied.</H2>
<HR noshade size="1px">
Bad request.
We can't connect to the server for this app or website at this time. There might be too much traffic or a configuration error. Try again later, or contact the app or website owner.
<BR clear="all">
If you provide content to customers through CloudFront, you can find steps to troubleshoot and help prevent this error by reviewing the CloudFront documentation.
<BR clear="all">
<HR noshade size="1px">
<PRE>
Generated by cloudfront (CloudFront)
Request ID: iEXFhiP_CsxoQhlfeCQf6c12ZikAJBNqsftyZtYi_7fbDnoYBr9u0Q==
</PRE>
<ADDRESS>
</ADDRESS>
</BODY></HTML>

---

Here’s what I was expecting

Result of the 2 requests

---

Here’s what I think could be improved

At first I thought the calls must be too close together. So I added a time.sleep between them, but without success.