def get_request_param(request: web.Request, name: str, error_if_missing: bool = True) -> Optional[str]:
"""Get a single value from a request GET parameter.
Optionally error if it is missing.
"""
if name not in request.rel_url.query:
if error_if_missing:
raise errors.NotFound()
else:
return None
ret = request.rel_url.query[name]
return ret
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