betteravatar — fast avatar fetcher

GET /<username>                 avatar image (40+ social providers raced)
GET /<username>?style=NAME      fallback style when no avatar is found
GET /<username>?provider=NAME   use only one provider (e.g. ?provider=github)
GET /<username>?providers=A,B   race only the listed providers
GET /_providers                 JSON list of providers
GET /_health                    ok

Fallback styles: gradient, flowers, smile, initials, shapes  (default: gradient)
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