ACME RFC 8555 support

20191014

Update dependency to include RFC 8555 impementation of acme protocol

20190816

Version built with Go 1.12.9 addressing http2 DoS vulnerability.

ACME http-01 challenge response support

Letsencrypt shuts down tls-sni challenge support advising clients to use http-01 / dns-01 challenges instead. This version adds support of http-01 challenge and enables http endpoint listening on port 80 by default (-http flag now has non-empty default value).

20170317: Add "X-Forwarded-Proto: https" header

Add X-Forwarded-Proto: https header which some backends expect to see to properly assemble URLs.

20161029

This release breaks backwards compatibity by changing usage flags: now instead of -cache flag pointing to single file it takes -cacheDir flag pointing to directory where generated key file and certificates are stored as separate files:

# find /var/cache/letsencrypt -type f
/var/cache/letsencrypt/acme_account.key
/var/cache/letsencrypt/example.org

20160716-1

Configurable read/write timeouts

20160715-1: Fix backend misusage

Fix a bug that could lead to using only the last backend for all
hostnames due to variable redefining.

See https://play.golang.org/p/yjiEENusQs as an illustration

20160519-1

Specifying -hsts flag would add Strict-Transport-Security: max-age=31536000; includeSubDomains header.

20160516-1

Add support for static sites handling