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Define /http-path #164

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Jun 5, 2024
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Define /http-path #164

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a20267c
Define httppath component
MarcoPolo Aug 24, 2023
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Expand reserved character set
MarcoPolo Aug 25, 2023
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Update protocols/httppath.md
MarcoPolo Aug 25, 2023
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Rephrase and use examples
MarcoPolo Aug 26, 2023
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Rename to http-path
MarcoPolo Apr 15, 2024
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1 change: 1 addition & 0 deletions protocols.csv
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ code, size, name, comment
465, 0, webtransport,
466, V, certhash,
480, 0, http, HyperText Transfer Protocol
481, V, http-path, Percent-encoded path to an HTTP resource
443, 0, https, Deprecated alias for /tls/http
477, 0, ws, WebSockets
478, 0, wss, Deprecated alias for /tls/ws
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37 changes: 37 additions & 0 deletions protocols/httppath.md
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# `http-path`

This protocol encodes an HTTP Path to a resource. In the string representation,
the path is encoded in a way consistent with a single URI Path segment per [RFC 3986 Section
3.3](https://datatracker.ietf.org/doc/html/rfc3986#autoid-23). Specifically
following the grammar of a single `segment-nz`. In the binary
representation, no encoding is needed as the value is length prefixed.

When comparing multiaddrs, implementations should compare their binary
representation to avoid ambiguities over which characters were escaped.

## Examples

The following is a table of examples converting some common HTTP paths to their Multiaddr string form.

| HTTP Path | Multiaddr string form |
| --------------- | --------------------------------- |
| / | n/a. This is implied. |
| /user | `/http-path/user` |
| /api/v0/login | `/http-path/api%2Fv0%2Flogin` |
| /tmp/foo/../bar | `/http-path/tmp%2Ffoo%2F..%2Fbar` |
| a%20space | `/http-path/a%2520space` |
| a%2Fslash | `/http-path/a%252Fslash` |

## Usage

`/http-path` should be appended to the end of an existing multiaddr, including after the peer id component (p2p). As an example, here's a multiaddr referencing the `.well-known/libp2p` HTTP resource along with a way to reach that peer:

```
/ip4/1.2.3.4/tcp/443/tls/http/p2p/12D.../http-path/.well-known%2Flibp2p
```

The `/http-path` component can also be appended to just the `/p2p/...` component, and rely on a separate peer discovery mechanism to actually identify the peer's address:

```
/p2p/12D.../http-path/.well-known%2Flibp2p
```
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