def log(
	messsage : str
):
	_sys.stderr.write("-- %s\n" % messsage)
	

def path_read(
	thing,
	steps : List[str]
):
	position = thing
	for step in steps:
		if (not (step in position)):
			raise ValueError("missing key '%s'" % ".".join(steps))
		position = position[step]
	return position
	

def path_write(
	thing,
	steps : List[str],
	value
):
	steps_first = steps[:-1]
	step_last = steps[-1]
	position = thing
	for step in steps_first:
		if (not (step in position)):
			position[step] = {}
		position = position[step]
	position[step_last] = value
	

def merge(
	core,
	mantle
):
    result = core.copy()
    result.update(mantle)
    return result
	

def http_call(
	request : dict,
) -> dict:
	connection = (
		{
			"http": (lambda: _http_client.HTTPConnection(request["url"]["host"], request["url"]["port"])),
			"https": (lambda:  _http_client.HTTPSConnection(request["url"]["host"], request["url"]["port"])),
		}[request["url"]["scheme"]]
	)()
	connection.request(
		request["method"],
		("/" + request["url"]["path"]),
		request["data"],
		request["headers"]
	)
	response_ = connection.getresponse()
	response = {
		"status": response_.status,
		"headers": dict(response_.getheaders()),
		"data": response_.read(),
	}
	return response