# I/O HTTP [](https://docs.rs/io-http/latest/io_http) [](https://matrix.to/#/#pimalaya:matrix.org)
Set of **I/O-free** Rust coroutines to manage HTTP streams, based on [io-stream](https://github.com/pimalaya/io-stream).
This library allows you to manage HTTP streams using an I/O-agnostic approach, based on 3 concepts:
### Coroutine
A coroutine is an *I/O-free*, *resumable* and *composable* state machine that **emits I/O requests**. A coroutine is considered *terminated* when it does not emit I/O requests anymore.
*See available coroutines at [./src/coroutines](https://github.com/pimalaya/io-http/tree/master/src).*
### Runtime
A runtime contains all the I/O logic, and is responsible for **processing I/O requests** emitted by coroutines.
*See available runtimes at [io-stream](https://github.com/pimalaya/io-stream/tree/master/src/runtimes).*
### Loop
The loop is the glue between coroutines and runtimes. It makes the coroutine progress while allowing runtime to process I/O.
## Examples
### Send HTTPS request via rustls synchronously
```rust,ignore
use std::{net::TcpStream, sync::Arc};
use http::Request;
use io_http::v1_1::coroutines::send::{SendHttp, SendHttpResult};
use io_stream::runtimes::std::handle;
use rustls::{ClientConfig, ClientConnection, StreamOwned};
use rustls_platform_verifier::ConfigVerifierExt;
// build TLS stream
let domain = "github.com"
let config = ClientConfig::with_platform_verifier().unwrap();
let server_name = domain.to_string().try_into().unwrap();
let conn = ClientConnection::new(Arc::new(config), server_name).unwrap();
let tcp = TcpStream::connect((domain, 443)).unwrap();
let tls = StreamOwned::new(conn, tcp);
// send request send receive response
let request = Request::get("/").body(vec![]).unwrap();
let mut arg = None;
let mut send = SendHttp::new(request);
let response = loop {
match send.resume(arg.take()) {
SendHttpResult::Ok(result) => break result.response,
SendHttpResult::Err(err) => panic!("{err}"),
SendHttpResult::Io(io) => arg = Some(handle(&mut stream, io).unwrap()),
}
};
```
*See complete example at [./examples/send.rs](https://github.com/pimalaya/io-http/blob/master/examples/send.rs).*
## More examples
Have a look at projects built on the top of this library:
- [io-addressbook](https://github.com/pimalaya/io-addressbook): Set of I/O-free coroutines to manage contacts
- [io-oauth](https://github.com/pimalaya/io-oauth): Set of I/O-free Rust coroutines to manage OAuth flows
- [io-starttls](https://github.com/pimalaya/io-starttls): I/O-free Rust coroutine to upgrade any plain stream to a secure one
- [Cardamum](https://github.com/pimalaya/cardamum): CLI to manage contacts
- [Ortie](https://github.com/pimalaya/ortie): CLI to manage OAuth access tokens
## License
This project is licensed under either of:
- [MIT license](LICENSE-MIT)
- [Apache License, Version 2.0](LICENSE-APACHE)
at your option.
## Sponsoring
[](https://nlnet.nl/)
Special thanks to the [NLnet foundation](https://nlnet.nl/) and the [European Commission](https://www.ngi.eu/) that helped the project to receive financial support from various programs:
- [NGI Assure](https://nlnet.nl/project/Himalaya/) in 2022
- [NGI Zero Entrust](https://nlnet.nl/project/Pimalaya/) in 2023
- [NGI Zero Core](https://nlnet.nl/project/Pimalaya-PIM/) in 2024 *(still ongoing)*
If you appreciate the project, feel free to donate using one of the following providers:
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