Payload Identification for RequestRecord and ResponseRecord is hardwired to HTTP about warcprotocol HOT 8 CLOSED

using var writer = new WarcWriter("your file");
var record = new RequestRecord(
    version: "1.1",
    recordId: new Uri("urn:uuid:e540b81b-09f6-4aff-a818-4a132778a3f6"),
    date: DateTime.Now,
    new PayloadTypeIdentifier(),
    contentBlock: Encoding.UTF8.GetBytes($"gemini://gemi.dev/why- gemini.gmi{WarcParser.CrLf}"),
    contentType: "application/gemini; msgtype=request",
    infoId: new Uri("urn:uuid:d1905d86-66a1-4910-8c69-81ec8f9c2c95"),
    targetUri: new Uri("gemini://gemi.dev/why-gemini.gmi"));
writer.Write(record);

var content = $"20 text/gemini\r\n# 🤓 Gemini Space for hacking \r\n\r\nAs of January 2022, there are only about there’s only around 200,000 pages across 1200 domains. This is small enough to be manageable, but large enough to be interesting to work on. To put things in perspective, Gemini space is roughly the size of WWW in 1992 right now.\r\n\r\nFun areas to hack on:\r\n* How can I surface cool and interesting content?\r\n* How do you search this space? How do you keep that up-to-date? This is great excuse to play around with full text search, reverse indexes, and hashtags?\r\n* How can you find meaningful meta data with a spartian protocol?\r\n* What does a graphic of Gemini space look like? How can we visualize the world of content?\r\n* How interconnecting are capsules and pages? How smol is this smol space?\r\n\r\nSome ideas in my head:\r\n* Antenna is freaking amazing! How can we better discovery content like this automatically? Polling gemlogs, etc.\r\n* Searching Gemini: This is a big one. We have a few search engines, but the results can be hit or miss. How can we improve this?\r\n* Gemini space is dynamic (e.g. ☠️ the Mailing List ☠️). Should we archive content? How would a Wayback machine for Geminispace work?\r\n* Capsule linter: Crawling gemini I see a lot of problems with various capsules. Broken links, bad Mimetypes, invalid gemtext, content in other languages missing \"lang=\" attributes, etc.{WarcParser.CrLf}";
using var writer = new WarcWriter("your file");
var concurrentTos = new HashSet<Uri>
{
    new Uri("urn:uuid:e540b81b-09f6-4aff-a818-4a132778a3f6"),
};

var record = new ResponseRecord(
    version: "1.1",
    recordId: new Uri("urn:uuid:2f66d487-3130-4b2b-a227-9dfa2bc8247f"),
    date: DateTime.Now,
    new CustomPayloadTypeIdentifier(),
    contentBlock: Encoding.UTF8.GetBytes(content),
    contentType: "application/gemini; msgtype=response",
    infoId: new Uri("urn:uuid:d1905d86-66a1-4910-8c69-81ec8f9c2c95"),
    targetUri: new Uri("gemini://gemi.dev/why-gemini.gmi"),
    // payloadDigest: "manually computed sha", // Uncomment to get the WARC-Payload-Digest header
    concurrentTos: concurrentTos,
    digestFactory: new DigestFactory("sha1"));
writer.Write(record);

....

//  This will produce the `WARC-Identified-Payload-Type: foobar` header
private class CustomPayloadTypeIdentifier : PayloadTypeIdentifier
{
    public override string? Identify(byte[] payload)
    {
        return "foobar";
    }
}

var content = $"20 text/gemini\r\n# A test file that doesn't have a double CRLF anywhere.\nJust A Test";
using(var writer = new WarcWriter("path-to-warc.warc")) {
    var concurrentTos = new HashSet<Uri>
{
    new Uri("urn:uuid:e540b81b-09f6-4aff-a818-4a132778a3f6"),
};

    var record = new ResponseRecord(
        version: "1.1",
        recordId: new Uri("urn:uuid:2f66d487-3130-4b2b-a227-9dfa2bc8247f"),
        date: DateTime.Now,
        new CustomPayloadTypeIdentifier(),
        contentBlock: Encoding.UTF8.GetBytes(content),
        contentType: "application/gemini; msgtype=response",
        infoId: new Uri("urn:uuid:d1905d86-66a1-4910-8c69-81ec8f9c2c95"),
        targetUri: new Uri("gemini://gemi.dev/why-gemini.gmi"),
        // payloadDigest: "manually computed sha", // Uncomment to get the WARC-Payload-Digest header
        concurrentTos: concurrentTos,
        digestFactory: new DigestFactory("sha1"));
    writer.Write(record);
}

//  This will produce the `WARC-Identified-Payload-Type: foobar-payload-length-` and the length of the byte array received
public class CustomPayloadTypeIdentifier : PayloadTypeIdentifier
{
    public override string? Identify(byte[] payload)
    {
        return $"foobar-payload-length-{payload.Length}";
    }
}

WARC/1.1
WARC-Type: response
WARC-Record-ID: <urn:uuid:2f66d487-3130-4b2b-a227-9dfa2bc8247f>
WARC-Date: 2023-04-26T15:20:02Z
Content-Length: 83
Content-Type: application/gemini; msgtype=response
WARC-Concurrent-To: <urn:uuid:e540b81b-09f6-4aff-a818-4a132778a3f6>
WARC-Block-Digest: sha1:A2D708682D4A6534EA21B7A3E82BFA223C7215BD
WARC-Target-URI: gemini://gemi.dev/why-gemini.gmi
WARC-Warcinfo-ID: <urn:uuid:d1905d86-66a1-4910-8c69-81ec8f9c2c95>
WARC-Identified-Payload-Type: foobar-payload-length-0

20 text/gemini
# A test file that doesn't have a double \r\n anywhere.
Just A Test