python coinbase pro sandbox authentication request error

Trying to use the example python from the coinbase pro api to do an authenticated request... it doesn't work going to the sandbox. I get the following error. Isn't there a simple request example that works on the web somewhere?

import json, hmac, hashlib, time, requests, base64 from requests.auth import AuthBase #sandbox api keys and url API_KEY='XX...........' API_PASS='XX.........' API_SECRET='XX.............' api_url='https://public.sandbox.pro.coinbase.com/' def jprint(obj): # create a formatted string of the Python JSON object text = json.dumps(obj, sort_keys=True, indent=4) print(text) # Create custom authentication for Exchange class CoinbaseExchangeAuth(AuthBase): def __init__(self, api_key, secret_key, passphrase): self.api_key = api_key self.secret_key = secret_key self.passphrase = passphrase def __call__(self, request): timestamp = str(time.time()) message = timestamp + request.method + request.path_url + (request.body or b'').decode() hmac_key = base64.b64decode(self.secret_key) signature = hmac.new(hmac_key, message.encode(), hashlib.sha256) signature_b64 = base64.b64encode(signature.digest()).decode() request.headers.update({ 'CB-ACCESS-SIGN': signature_b64, 'CB-ACCESS-TIMESTAMP': timestamp, 'CB-ACCESS-KEY': self.api_key, 'CB-ACCESS-PASSPHRASE': self.passphrase, 'Content-Type': 'application/json' }) return request api_url = 'https://api.pro.coinbase.com/' #sandbox url api_url='https://public.sandbox.pro.coinbase.com/' auth = CoinbaseExchangeAuth(API_KEY, API_SECRET, API_PASS) # Get accounts r = requests.get(api_url + 'accounts', auth=auth) print(r.status_code) jprint(r.json()) # Place an order order = { 'size': 1.0, 'price': 1.0, 'side': 'buy', 'product_id': 'BTC-USD', } r = requests.post(api_url + 'orders', json=order, auth=auth) print(r.status_code) jprint(r.json()) 

Here is what I get back....

200

Traceback (most recent call last):

File "/Users/rockie12_us/PythonScriptsDeanO/SandBoxClientTest/test9.py", line 46, in jprint(r.json())

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/requests/models.py", line 897, in json return complexjson.loads(self.text, **kwargs)

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/init.py", line 346, in loads return _default_decoder.decode(s) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end())

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[Finished in 0.6s with exit code 1]