POST /acme/authz/PAniVnsZcis HTTP/1.1
Host: example.com
Content-Type: application/jose+json

{
    "protected": base64url({
        "alg": "ES256",
        "kid": "https://example.com/acme/acct/evOfKhNU60wg",
        "nonce": "uQpSjlRb4vQVCjVYAyyUWg",
        "url": "https://example.com/acme/authz/PAniVnsZcis"
    }),
    "payload": "",
    "signature": "nuSDISbWG8mMgE7H...QyVUL68yzf3Zawps"
}

HTTP/1.1 200 OK
Content-Type: application/json
Link: <https://example.com/acme/directory>;rel="index"

{
    "status": "pending",
    "expires": "2016-01-02T14:09:30Z",

    "identifier": {
        "type": "dns",
        "value": "www.example.org"
    },

    "challenges": [
        {
            "type": "http-01",
            "url": "https://example.com/acme/chall/prV_B7yEyA4",
            "token": "DGyRejmCefe7v4NfDGDKfA"
        },
        {
            "type": "dns-01",
            "url": "https://example.com/acme/chall/Rg5dV14Gh1Q",
            "token": "DGyRejmCefe7v4NfDGDKfA"
        }
    ]
}