Add DNS provider for "HTTP request".

[ldez]

The server must provide:

• POST /present
• POST /cleanup

The URL of the server must be define by HTTPREQ_ENDPOINT.

Mode

There are 2 modes (HTTPREQ_MODE):

• default mode:

{
  "fqdn": "_acme-challenge.domain.",
  "value": "LHDhK3oGRvkiefQnx7OOczTY5Tic_xZ6HcMOc_gmtoM"
}

• RAW

{
  "domain": "domain",
  "token": "token",
  "keyAuth": "key"
}

Authentication

Basic authentication (optional) can be set with some environment variables:

• HTTPREQ_USERNAME and HTTPREQ_PASSWORD
• both values must be set, otherwise basic authentication is not defined.

Additional information

Thanks to @mdbraber.
Related to #708

[mdbraber]

I've been trying to figure out if I can actually push to an unmerged PR I don't own, but I don't think I can?

Anyway: you've got "client" in places where it should say "present" (in the README). Also, I'd change the fqdn example to say '_acme-challenge.domain.tld.' to make it look less like an unqualified domainname.

(P.S. if you can explain if I could push these changes I'd be happy to do so if you can explain how ;-)

[ldez]

You cannot push on PR because you are not a maintainer, but you can do a review.

• https://help.github.com/articles/about-pull-request-reviews/

[ayang64]

Checks out.