Rust:如何对大文件进行 HTTP PUT？

Question

在 Rust 中，我使用 ureq执行 HTTP 请求。这是一个有效的 HEAD 请求:

let resp = ureq::head(&url).timeout_connect(5_000).call();
if !resp.ok() {
    return false;
}

我看到 ureq supports动词 PUT,pub fn put(path: &str) -> Request 只是不确定如何使用它。如何向其传递文件/文件句柄/完整路径？

这是我在 bash 中执行此操作的方法:

$ curl -v http://192.168.1.100:9193/  -T deleteme.mp4
* Expire in 0 ms for 6 (transfer 0x1102880)
*   Trying 192.168.1.100...
* TCP_NODELAY set
* Expire in 200 ms for 4 (transfer 0x1102880)
* Connected to 192.168.1.100 (192.168.1.100) port 9193 (#0)
> PUT /deleteme.mp4 HTTP/1.1
> Host: 192.168.1.100:9193
> User-Agent: curl/7.64.0
> Accept: */*
> Content-Length: 779189
> Expect: 100-continue
>
* Expire in 1000 ms for 0 (transfer 0x1102880)
< HTTP/1.1 100 Continue
* We are completely uploaded and fine
< HTTP/1.1 200 OK
< Date: Fri, 03 Jan 2020 23:57:41 GMT
< Content-Length: 0
<
* Connection #0 to host 192.168.1.100 left intact

$ curl -I http://192.168.1.100:9193/deleteme.mp4
HTTP/1.1 200 OK
Content-Length: 779189
Date: Fri, 03 Jan 2020 23:57:44 GMT

编辑 1

由于我的文件很大，我无法将其全部读入内存(耗尽)，而是需要 bufio reader 之类的东西。下面是我尝试的代码，但它失败了。在接收器上创建一个空文件。

响应[状态:500，status_text:网络错误] PUT deleteme.mp4 写入:0 字节，花费:70.4μs

use std::error::Error;
use std::fs::File;
use std::io::{BufRead, BufReader};

const FILE_NAME: &str = "/tmp/deleteme.mp4";

fn main() -> Result<(), Box<dyn Error>> {
    println!("Hello, world!");
    let f = File::open(FILE_NAME)?;
    let mut buffered_reader = BufReader::new(f);
    let r = ureq::put("http://192.168.1.100:9193/deleteme.mp4").send(buffered_reader);
    println!("{:?}", r);

    println!("Bye!");

    Ok(())
}

如何使 BufReader 和 ureq 之间的管道工作？

Answer 1

对于具有非空正文的 HTTP 请求，您必须设置 Content-Length 或 Transfer-Encoding header 。例如，您的curl session 中有一个Content-Length header 。

ureq::Request::send_bytes和 ureq::Request::send_string将为您设置此 header ，但是 ureq::Request::send惯于。你必须自己做:

use std::error::Error;
use std::fs::File;
use std::io::BufReader;

fn main() -> Result<(), Box<dyn Error>> {
    let f = File::open("/tmp/deleteme.mp4")?;
    let metadata = f.metadata()?;
    let buffered_reader = BufReader::new(f);
    let r = ureq::put("http://192.168.1.100:9193/deleteme.mp4")
        .set("Content-Length", &metadata.len().to_string())
        .send(buffered_reader);
    println!("{:?}", r);

    Ok(())
}