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https://github.com/alexcrichton/curl-rust

Rust bindings to libcurl
https://github.com/alexcrichton/curl-rust

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Rust bindings to libcurl

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# curl-rust



[libcurl] bindings for Rust



[![Latest Version](https://img.shields.io/crates/v/curl.svg)](https://crates.io/crates/curl)

[![Documentation](https://docs.rs/curl/badge.svg)](https://docs.rs/curl)

[![License](https://img.shields.io/github/license/alexcrichton/curl-rust.svg)](LICENSE)

[![Build](https://github.com/alexcrichton/curl-rust/workflows/CI/badge.svg)](https://github.com/alexcrichton/curl-rust/actions)



## Quick Start



```rust

use std::io::{stdout, Write};



use curl::easy::Easy;



// Print a web page onto stdout

fn main() {

    let mut easy = Easy::new();

    easy.url("https://www.rust-lang.org/").unwrap();

    easy.write_function(|data| {

        stdout().write_all(data).unwrap();

        Ok(data.len())

    }).unwrap();

    easy.perform().unwrap();



    println!("{}", easy.response_code().unwrap());

}

```



```rust

use curl::easy::Easy;



// Capture output into a local `Vec`.

fn main() {

    let mut dst = Vec::new();

    let mut easy = Easy::new();

    easy.url("https://www.rust-lang.org/").unwrap();



    let mut transfer = easy.transfer();

    transfer.write_function(|data| {

        dst.extend_from_slice(data);

        Ok(data.len())

    }).unwrap();

    transfer.perform().unwrap();

}

```



## Post / Put requests



The `put` and `post` methods on `Easy` can configure the method of the HTTP

request, and then `read_function` can be used to specify how data is filled in.

This interface works particularly well with types that implement `Read`.



```rust,no_run

use std::io::Read;

use curl::easy::Easy;



fn main() {

    let mut data = "this is the body".as_bytes();



    let mut easy = Easy::new();

    easy.url("http://www.example.com/upload").unwrap();

    easy.post(true).unwrap();

    easy.post_field_size(data.len() as u64).unwrap();



    let mut transfer = easy.transfer();

    transfer.read_function(|buf| {

        Ok(data.read(buf).unwrap_or(0))

    }).unwrap();

    transfer.perform().unwrap();

}

```



## Custom headers



Custom headers can be specified as part of the request:



```rust,no_run

use curl::easy::{Easy, List};



fn main() {

    let mut easy = Easy::new();

    easy.url("http://www.example.com").unwrap();



    let mut list = List::new();

    list.append("Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==").unwrap();

    easy.http_headers(list).unwrap();

    easy.perform().unwrap();

}

```



## Keep alive



The handle can be re-used across multiple requests. Curl will attempt to

keep the connections alive.



```rust,no_run

use curl::easy::Easy;



fn main() {

    let mut handle = Easy::new();



    handle.url("http://www.example.com/foo").unwrap();

    handle.perform().unwrap();



    handle.url("http://www.example.com/bar").unwrap();

    handle.perform().unwrap();

}

```



## Multiple requests



The libcurl library provides support for sending multiple requests

simultaneously through the "multi" interface. This is currently bound in the

`multi` module of this crate and provides the ability to execute multiple

transfers simultaneously. For more information, see that module.



## Building



By default, this crate will attempt to dynamically link to the system-wide

libcurl and the system-wide SSL library. Some of this behavior can be customized

with various Cargo features:



- `ssl`: Enable SSL/TLS support using the platform-default TLS backend. On Windows this is [Schannel], on macOS [Secure Transport], and [OpenSSL] (or equivalent) on all other platforms.  Enabled by default.

- `rustls` Enable SSL/TLS support via [Rustls], a well-received alternative TLS backend written in Rust. Rustls is always statically linked. Disabled by default.



  Note that Rustls support is experimental within Curl itself and may have significant bugs, so we don't offer any sort of stability guarantee with this feature.

- `http2`: Enable HTTP/2 support via libnghttp2. Disabled by default.

- `static-curl`: Use a bundled libcurl version and statically link to it. Disabled by default.

- `static-ssl`: Use a bundled OpenSSL version and statically link to it. Only applies on platforms that use OpenSSL. Disabled by default.

- `spnego`: Enable SPNEGO support. Disabled by default.

- `upkeep_7_62_0`: Enable curl_easy_upkeep() support, introduced in curl 7.62.0. Disabled by default.

- `poll_7_68_0`: Enable curl_multi_poll()/curl_multi_wakeup() support, requires curl 7.68.0 or later. Disabled by default.

- `ntlm`: Enable NTLM support in curl. Disabled by default.

- `windows-static-ssl`: Enable Openssl support on Windows via the static build provided by vcpkg. Incompatible with `ssl` (use `--no-default-features`). Disabled by default.



  Note that to install openssl on windows via vcpkg the following commands needs to be ran:

  ```shell

  git clone https://github.com/microsoft/vcpkg

  cd vcpkg

  ./bootstrap-vcpkg.bat -disableMetrics

  ./vcpkg.exe integrate install

  ./vcpkg.exe install openssl:x64-windows-static-md

  ```



## Version Support



The bindings have been developed using curl version 7.24.0. They should

work with any newer version of curl and possibly with older versions,

but this has not been tested.



## Troubleshooting



### Curl built against the NSS SSL library



If you encounter the following error message:



```

  [77] Problem with the SSL CA cert (path? access rights?)

```



That means most likely, that curl was linked against `libcurl-nss.so` due to

installed libcurl NSS development files, and that the required library

`libnsspem.so` is missing. See also the curl man page: "If curl is built

against the NSS SSL library, the NSS PEM PKCS#11 module (`libnsspem.so`) needs to be available for this option to work properly."



In order to avoid this failure you can either



 * install the missing library (e.g. Debian: `nss-plugin-pem`), or

 * remove the libcurl NSS development files (e.g. Debian: `libcurl4-nss-dev`) and

   rebuild curl-rust.



## License



The `curl-rust` crate is licensed under the MIT license, see [`LICENSE`](LICENSE) for more

details.



[libcurl]: https://curl.haxx.se/libcurl/

[OpenSSL]: https://www.openssl.org/

[Rustls]: https://github.com/ctz/rustls

[Schannel]: https://docs.microsoft.com/en-us/windows/win32/com/schannel

[Secure Transport]: https://developer.apple.com/documentation/security/secure_transport