我尝试用python获取地图服务的图像。 Google静态地图和mapquestapi.com无效。当我尝试从其他服务器检索静态图像时，一切正常，但在地图服务中，我收到此错误：
ERROR handlers: message: plugins.xxx._scan_for_triggers : coroutine
Traceback (most recent call last):
File "/xxx/handlers.py", line xxx, in run_pluggable_omnibus
yield from function(*_passed)
File "/xxx/plugins/xxx.py", line 54, in _scan_for_triggers
img_id = yield from xxx._client.upload_image(img_data, filename=filename)
File "/usr/local/lib/python3.4/site-packages/xxx/client.py", line 472, in upload_image
upload_url = (json.loads(res1.body.decode())['sessionStatus']
KeyError: 'sessionStatus'
这里是代码：
r = yield from aiohttp.request('get', img_link)
raw = yield from r.read()
img_data = io.BytesIO(raw)
filename = "xxx"
img_id = yield from xxx._client.upload_image(img_data, filename=filename)