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Hyperglass supports configurable rate limiting of both site loads and queries. By default, users are able to reach the site up to 120 times per minute, and submit up to 5 queries per minute. When the site limit is reached, users are directed to a separate error page until the timer expires. When the query limit is reached, an error message is displayed, and no further queries are allowed until the timer expires.
Hyperglass uses Flask-Limiter to handle application rate limiting. In Flask, the /lg route, which is used for actual queries, is associated with the query rate limit, while the default / route is associated with the site rate limit. Both of these limits are configurabale in hyperglass/hyperglass/configs/config.toml. See here for more information.