# Functions
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# Constants
DNS01 is the "dns-01" ACME challenge https://www.rfc-editor.org/rfc/rfc8555.html#section-8.4 Note: GetRecord returns a DNS record which will fulfill this challenge.
HTTP01 is the "http-01" ACME challenge https://www.rfc-editor.org/rfc/rfc8555.html#section-8.3 Note: ChallengePath returns the URL path to fulfill this challenge.
TLSALPN01 is the "tls-alpn-01" ACME challenge https://www.rfc-editor.org/rfc/rfc8737.html.
# Interfaces
Provider enables implementing a custom challenge provider.
ProviderTimeout allows for implementing a Provider where an unusually long timeout is required when waiting for an ACME challenge to be satisfied, such as when checking for DNS record propagation.
# Type aliases
Type is a string that identifies a particular challenge type and version of ACME challenge.