英文:
Making http request by tcp connection in go
问题
package main
import (
"crypto/tls"
"fmt"
)
func main() {
conf := &tls.Config{}
conn, _ := tls.Dial("tcp", "www.google.com:443", conf)
data := []byte("GET / HTTP/1.1\r\nHost: www.google.com\r\n\r\n")
conn.Write(data)
buf := make([]byte, 5000)
conn.Read(buf)
fmt.Println(string(buf[:]))
}
我正在尝试通过原始的TCP连接数据进行HTTP请求，但是收到了400 Bad Request的错误响应，请问问题出在哪里？
英文:
package main
import (
"crypto/tls"
"fmt"
)
func main() {
conf := &tls.Config{}
conn, _ := tls.Dial("tcp", "www.google.com:443", conf)
data := []byte("GET / HTTP1.1\r\nHost: www.google.com\r\n\r\n")
conn.Write(data)
buf := make([]byte, 5000)
conn.Read(buf)
fmt.Println(string(buf[:]))
}
I am trying to make http request by raw tcp connection data, but get an error response of 400 Bad Request, what's the issue.
答案1
得分: 2
数据中有一个拼写错误。
HTTP1.1 应该是 HTTP/1.1。
我想分享一下我是如何发现这个错误的，希望能帮助到其他人。
当我想解决一个我不太熟悉的问题时，我首先要做的是找出它在正常情况下是什么样子的。我之前使用过 nc，所以我首先尝试使用它。
这是 nc 的 man 页面上的一个示例：
$ printf "GET / HTTP/1.0\r\n\r\n" | nc host.example.com 80
所以我首先将 host.example.com 替换为 www.google.com：
$ printf "GET / HTTP/1.0\r\n\r\n" | nc www.google.com 80
它正常工作！
然后将 HTTP/1.0 替换为 HTTP/1.1。仍然正常工作！
然后添加 Host 头部：
$ printf "GET / HTTP/1.1\r\nHost: www.google.com\r\n\r\n" | nc www.google.com 80
正常工作！
然后复制问题中的字符串：
$ printf "GET / HTTP1.1\r\nHost: www.google.com\r\n\r\n" | nc www.google.com 80
这次得到了 400 Bad Request。
这是一个很大的进步！请求中有些问题。通过比较这两个请求，很容易发现拼写错误。
最后，在原始演示中修复这个错误，并运行演示以验证问题是否已解决。完成！
谢谢阅读！
英文:
There is a typo in the data.
HTTP1.1 should be HTTP/1.1.
I would like to share how I found the typo in the hope that it helps others.
When I want to address an issue that I'm not so familiar with, the first thing I do is to find out what it looks like when it works. I have used nc before, so I will try it first.
This is an example from the man page of nc:
$ printf "GET / HTTP/1.0\r\n\r\n" | nc host.example.com 80
So I replaced host.example.com with www.google.com first:
$ printf "GET / HTTP/1.0\r\n\r\n" | nc www.google.com 80
It works!
Then replace HTTP/1.0 with HTTP/1.1. Still works!
Then add the Host header:
$ printf "GET / HTTP/1.1\r\nHost: www.google.com\r\n\r\n" | nc www.google.com 80
Works!
Then copy the string from the question:
$ printf "GET / HTTP1.1\r\nHost: www.google.com\r\n\r\n" | nc www.google.com 80
Got 400 Bad Request this time.
This is a big step forward! There is something wrong in the request. It's easy to spot the typo by comparing the two requests.
Finally, fix the typo in the original demo, and run the demo to verify that the issue has been addressed. Done!
Thanks for reading!
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论