aiohttp failed response.json() with status 500
<p>Server proxies requests. </p>

<pre><code>@asyncio.coroutine
def send_async_request(method, url, data, timeout):
    with ClientSession() as session:
        response = yield from asyncio.wait_for(
            session.request(method, url, data=data), timeout=timeout
        )
        return response
</code></pre>

<p>Everything works on the response codes 200.
When it comes to 500 response code can not read the json from the response.
Exception ServerDisconnectedError:</p>

<pre><code>response = yield from send_async_request(request.method, url)
response_json = yield from response.json()

Traceback (most recent call last):  

File "C:\Python34\lib\site-packages\aiohttp\server.py", line 285, in start
    yield from self.handle_request(message, payload)
  File "C:\Python34\lib\site-packages\aiohttp\web.py", line 90, in handle_request
    resp = yield from handler(request)
  File "D:/projects/SeleniumGridDispatcher/trunk/application.py", line 122, in proxy_wd
    response_json = yield from response.json()
  File "C:\Python34\lib\site-packages\aiohttp\client_reqrep.py", line 764, in json
    yield from self.read()
  File "C:\Python34\lib\site-packages\aiohttp\client_reqrep.py", line 720, in read
    self._content = yield from self.content.read()
  File "C:\Python34\lib\site-packages\aiohttp\streams.py", line 486, in wrapper
    result = yield from func(self, *args, **kw)
  File "C:\Python34\lib\site-packages\aiohttp\streams.py", line 541, in read
    return (yield from super().read(n))
  File "C:\Python34\lib\site-packages\aiohttp\streams.py", line 261, in read
    block = yield from self.readany()
  File "C:\Python34\lib\site-packages\aiohttp\streams.py", line 486, in wrapper
    result = yield from func(self, *args, **kw)
  File "C:\Python34\lib\site-packages\aiohttp\streams.py", line 549, in readany
    return (yield from super().readany())
  File "C:\Python34\lib\site-packages\aiohttp\streams.py", line 284, in readany
    yield from self._waiter
  File "C:\Python34\lib\asyncio\futures.py", line 358, in __iter__
    yield self  # This tells Task to wait for completion.
  File "C:\Python34\lib\asyncio\tasks.py", line 290, in _wakeup
    future.result()
  File "C:\Python34\lib\asyncio\futures.py", line 274, in result
    raise self._exception
aiohttp.errors.ServerDisconnectedError
</code></pre>

<p>Help to understand what was going on.
Python: 3.4.4
aiohttp: 0.22.5</p>

<p>Please check <code>Content-Length</code> for 500 response.
Looks like aiohttp tries to read json body but the body is shorter than specified in headers.</p>

python json python-asyncio aiohttp