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# Protocol::HTTP
Provides abstractions for working with the HTTP protocol.
[](https://github.com/socketry/protocol-http/actions?workflow=Test)
## Features
- General abstractions for HTTP requests and responses.
- Symmetrical interfaces for client and server.
- Light-weight middleware model for building applications.
## Usage
Please see the [project documentation](https://socketry.github.io/protocol-http/) for more details.
- [Getting Started](https://socketry.github.io/protocol-http/guides/getting-started/index) - This guide explains how to use `protocol-http` for building abstract HTTP interfaces.
- [Message Body](https://socketry.github.io/protocol-http/guides/message-body/index) - This guide explains how to work with HTTP request and response message bodies using `Protocol::HTTP::Body` classes.
- [Headers](https://socketry.github.io/protocol-http/guides/headers/index) - This guide explains how to work with HTTP headers using `protocol-http`.
- [Middleware](https://socketry.github.io/protocol-http/guides/middleware/index) - This guide explains how to build and use HTTP middleware with `Protocol::HTTP::Middleware`.
- [Streaming](https://socketry.github.io/protocol-http/guides/streaming/index) - This guide gives an overview of how to implement streaming requests and responses.
- [Design Overview](https://socketry.github.io/protocol-http/guides/design-overview/index) - This guide explains the high level design of `protocol-http` in the context of wider design patterns that can be used to implement HTTP clients and servers.
## Releases
Please see the [project releases](https://socketry.github.io/protocol-http/releases/index) for all releases.
### v0.55.0
- **Breaking**: Move `Protocol::HTTP::Header::QuotedString` to `Protocol::HTTP::QuotedString` for better reusability.
- **Breaking**: Handle cookie key/value pairs using `QuotedString` as per RFC 6265.
- Don't use URL encoding for cookie key/value.
- **Breaking**: Remove `Protocol::HTTP::URL` and `Protocol::HTTP::Reference` – replaced by `Protocol::URL` gem.
- `Protocol::HTTP::URL` -\> `Protocol::URL::Encoding`.
- `Protocol::HTTP::Reference` -\> `Protocol::URL::Reference`.
### v0.54.0
- Introduce rich support for `Header::Digest`, `Header::ServerTiming`, `Header::TE`, `Header::Trailer` and `Header::TransferEncoding`.
- [Improved HTTP Trailer Security](https://socketry.github.io/protocol-http/releases/index#improved-http-trailer-security)
### v0.53.0
- Improve consistency of Body `#inspect`.
- Improve `as_json` support for Body wrappers.
### v0.52.0
- Add `Protocol::HTTP::Headers#to_a` method that returns the fields array, providing compatibility with standard Ruby array conversion pattern.
- Expose `tail` in `Headers.new` so that trailers can be accurately reproduced.
- Add agent context.
### v0.51.0
- `Protocol::HTTP::Headers` now raise a `DuplicateHeaderError` when a duplicate singleton header (e.g. `content-length`) is added.
- `Protocol::HTTP::Headers#add` now coerces the value to a string when adding a header, ensuring consistent behaviour.
- `Protocol::HTTP::Body::Head.for` now accepts an optional `length` parameter, allowing it to create a head body even when the body is not provided, based on the known content length.
### v0.50.0
- Drop support for Ruby v3.1.
### v0.48.0
- Add support for parsing `accept`, `accept-charset`, `accept-encoding` and `accept-language` headers into structured values.
### v0.46.0
- Add support for `priority:` header.
### v0.33.0
- Clarify behaviour of streaming bodies and copy `Protocol::Rack::Body::Streaming` to `Protocol::HTTP::Body::Streamable`.
- Copy `Async::HTTP::Body::Writable` to `Protocol::HTTP::Body::Writable`.
### v0.31.0
- Ensure chunks are flushed if required, when streaming.
## See Also
- [protocol-http1](https://github.com/socketry/protocol-http1) — HTTP/1 client/server implementation using this
interface.
- [protocol-http2](https://github.com/socketry/protocol-http2) — HTTP/2 client/server implementation using this
interface.
- [protocol-url](https://github.com/socketry/protocol-url) — URL parsing and manipulation library.
- [async-http](https://github.com/socketry/async-http) — Asynchronous HTTP client and server, supporting multiple HTTP
protocols & TLS.
- [async-websocket](https://github.com/socketry/async-websocket) — Asynchronous client and server WebSockets.
## Contributing
We welcome contributions to this project.
1. Fork it.
2. Create your feature branch (`git checkout -b my-new-feature`).
3. Commit your changes (`git commit -am 'Add some feature'`).
4. Push to the branch (`git push origin my-new-feature`).
5. Create new Pull Request.
### Developer Certificate of Origin
In order to protect users of this project, we require all contributors to comply with the [Developer Certificate of Origin](https://developercertificate.org/). This ensures that all contributions are properly licensed and attributed.
### Community Guidelines
This project is best served by a collaborative and respectful environment. Treat each other professionally, respect differing viewpoints, and engage constructively. Harassment, discrimination, or harmful behavior is not tolerated. Communicate clearly, listen actively, and support one another. If any issues arise, please inform the project maintainers.
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