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502 Bad Gateway on site: https://kingsumo.com/giveaways/confirm/kk4w40y/c55d0eb7cb064ad68a3874f0a2cdcda221f5105c3958fd170271941c1295da95

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502 Bad Gateway on lots of kingsumo.com sites such as: https://kingsumo.com/giveaways/confirm/kk4w40y/c55d0eb7cb064ad68a3874f0a2cdcda221f5105c3958fd170271941c1295da95 why? It does not happen on Chrome

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here is another kingsumo site with 502 Bad Gateway; https://kingsumo.com/g/gslltf/sweet-romances-and-sweet-candies