Sockets 什么会导致生锈'；s TcpSocket:：write（）返回；无效输入“；？

我想在Rust中发出一个简单的HTTP请求。我把它放在一起，效果很好：

use std::io::TcpStream;

fn main() {
    // This just does a "GET /" to www.stroustrup.com
    println!("Establishing connection...");
    let mut stream = TcpStream::connect("www.stroustrup.com:80").unwrap();

    println!("Writing HTTP request...");
    // unwrap() the result to make sure it succeeded, at least
    let _ = stream.write(b"GET / HTTP/1.1\r\n\
                           Host: www.stroustrup.com\r\n\
                           Accept: */*\r\n\
                           Connection: close\r\n\r\n").unwrap();

    println!("Reading response...");
    let response = stream.read_to_string().unwrap();

    println!("Printing response:");
    println!("{}", response);
}

答复是：

Establishing connection...
Writing HTTP request...
Reading response...
Printing response:
HTTP/1.1 200 OK
...and the rest of the long HTTP response with all the HTML as I'd expect...

但是，如果我将请求更改为

/C++.html

，而不是

/

：

use std::io::TcpStream;

fn main() {
    // The only change is to "GET /C++.html" instead of "GET /"
    println!("Establishing connection...");
    let mut stream = TcpStream::connect("www.stroustrup.com:80").unwrap();

    println!("Writing HTTP request...");
    // unwrap() the result to make sure it succeeded, at least
    let _ = stream.write(b"GET /C++.html HTTP/1.1\r\n\
                           Host: www.stroustrup.com\r\n\
                           Accept: */*\r\n\
                           Connection: close\r\n\r\n").unwrap();

    println!("Reading response...");
    let response = stream.read_to_string().unwrap();

    println!("Printing response:");
    println!("{}", response);
}

套接字返回“无效输入”：

“无效输入”

错误不是来自套接字。它来自

String

。如果

read\u to\u string（）

调用更改为

read\u to\u end（）

，则响应成功。显然，这个回答是无效的UTF-8

更明确地说，代码：

println!("Reading response...");
let response = stream.read_to_end().unwrap();

println!("Printing response:");
println!("{}", String::from_utf8(response));

返回：

Err(invalid utf-8: invalid byte at index 14787)

因此HTTP响应是错误的。查看网页，错误在这里（代码

�字符是问题的关键）：

有问题的字符是0x96，实际上是无效的utf-8。应该是U+2013——
该文档为iso-8859-1或windows 1252。该HTML还存在许多其他问题，例如unscaped&'s

println!("Reading response...");
let response = stream.read_to_end().unwrap();

println!("Printing response:");
println!("{}", String::from_utf8(response));

Err(invalid utf-8: invalid byte at index 14787)

Lang.Next'14 Keynote: What � if anything � have we learned from C++?