使用 reqwest 发送附件

Question

我正在尝试使用 reqwest 执行 POST 请求。我需要在请求中发送附件。我正在寻找

的等价物

curl -F attachment=@file.txt

在旧版本中（参见 here）它就像

一样简单

let file = fs::File::open("much_beauty.png")?;
let client = reqwest::Client::new();
let res = client.post("http://httpbin.org/post")
    .headers(construct_headers())
    .body(file)
    .send()?;

但对于较新的版本（参见 here），该功能似乎已被删除。我收到错误：

21 |         .body(file)
   |          ^^^^ the trait `From<File>` is not implemented for `Body`
   |
   = help: the following implementations were found:
             <Body as From<&'static [u8]>>
             <Body as From<&'static str>>
             <Body as From<Response>>
             <Body as From<String>>
           and 2 others
   = note: required because of the requirements on the impl of `Into<Body>` for `File`

尽管official documentation声称

The basic one is by using the body() method of a RequestBuilder. This lets you set the exact raw bytes of what the body should be. It accepts various types, including String, Vec<u8>, and File.

Answer 1

新的 API 可能不再为 Body 实现 From<File> 但确实为 Body 实现了 From<Vec<u8>> 我们可以轻松转换 File 变成 Vec<u8>.

事实上，标准库中已经有一个名为 std::fs::read 的方便函数，它将读取整个文件并将其存储在 Vec<u8> 中。这是更新后的工作示例：

let byte_buf: Vec<u8> = std::fs::read("much_beauty.png")?;
let client = reqwest::Client::new();
let res = client.post("http://httpbin.org/post")
    .headers(construct_headers())
    .body(byte_buf)
    .send()?;

使用 reqwest 发送附件

Sending attachment with reqwest

http

asynchronous

post

rust

reqwest