def send_command(self, method, url, body=None):
"""
Send a command to the remote end and validate its success.
:param method: HTTP method to use in request.
:param uri: "Command part" of the HTTP request URL,
e.g. `window/rect`.
:param body: Optional body of the HTTP request.
:return: `None` if the HTTP response body was empty, otherwise
the result of parsing the body as JSON.
:raises error.WebDriverException: If the remote end returns
an error.
"""
response = self.transport.send(method, url, body)
if "value" in response.body:
value = response.body["value"]
else:
raise error.UnknownErrorException(
"No 'value' key in response body:\n%s" %
json.dumps(response.body))
if response.status != 200:
cls = error.get(value.get("error"))
raise cls(value.get("message"))
return value
def from_http_response(cls, http_response):
status = http_response.status
body = http_response.read()
# SpecID: dfn-send-a-response
#
# > 3. Set the response's header with name and value with the following
# > values:
# >
# > "Content-Type"
# > "application/json; charset=utf-8"
# > "cache-control"
# > "no-cache"
if body:
try:
body = json.loads(body)
except:
raise error.UnknownErrorException("Failed to decode body as json:\n%s" % body)
return cls(status, body)