Golang 解析原始 HTTP/2 響應

Question

我有一個特定的情況，我需要將 HTTP/2 響應 output 解析為 Go 的http.Response 。 響應本身具有默認結構：

$ curl --include https://google.com

HTTP/2 301
location: https://www.google.com/
content-type: text/html; charset=UTF-8
date: Mon, 15 Jun 2020 11:08:39 GMT
expires: Wed, 15 Jul 2020 11:08:39 GMT
cache-control: public, max-age=2592000
server: gws
content-length: 220

<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="https://www.google.com/">here</A>.
</BODY></HTML>

地位和身體本身並不重要，這只是一個例子。

http library has function ReadResponse(r *bufio.Reader, req *Request) (*Response, error) which does exactly what I need, but it fails parsing HTTP/2 with malformed HTTP version HTTP/2 , however it works fine for HTTP /1.1 和 HTTP/1.0。 另外，在使用http.DefaultClient.Do()進行請求后，您可以看到響應的字段Proto包含HTTP/2.0 ，這意味着 HTTP/2 沒有問題。

任何想法如何解析此響應？

Answer 1

總結討論，解析錯誤的原因是http.ParseHTTPVersion not parse HTTP/2 ，將前綴 7 個字節替換為HTTP/2.0來修復它，或者為net/http提供 pr 支持來解析HTTP/2 。

package main

import (
    "bufio"
    "bytes"
    "fmt"
    "io"
    "net/http"
)

func main() {
    fmt.Println("Hello, playground")
    req, _ := http.NewRequest("GET", "https://google.com", nil)
    {
        resp, err := http.ReadResponse(bufio.NewReader(bytes.NewBuffer(httpbody)), req)
        fmt.Println(resp, err)
        // err is malformed HTTP version "HTTP/2", because http.ParseHTTPVersion not parse "HTTP/2"
    }

    {
        body := bytes.NewBuffer(httpbody)
        prefix := make([]byte, 7)
        n, err := io.ReadFull(body, prefix)
        if err != nil {
            panic("handler err")
        }
        fmt.Println(n, err, string(prefix))
        if string(prefix[:n]) == "HTTP/2 " {
            // fix HTTP/2 proto
            resp, err := http.ReadResponse(bufio.NewReader(io.MultiReader(bytes.NewBufferString("HTTP/2.0 "), body)), req)
            fmt.Println(resp, err)
        } else {
            // other proto
            resp, err := http.ReadResponse(bufio.NewReader(io.MultiReader(bytes.NewBuffer(prefix[:n]), body)), req)
            fmt.Println(resp, err)
        }
    }
}

var httpbody = []byte(`HTTP/2 301
location: https://www.google.com/
content-type: text/html; charset=UTF-8
date: Mon, 15 Jun 2020 11:08:39 GMT
expires: Wed, 15 Jul 2020 11:08:39 GMT
cache-control: public, max-age=2592000
server: gws
content-length: 220

<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="https://www.google.com/">here</A>.
</BODY></HTML>`)

output：

Hello, playground
<nil> malformed HTTP version "HTTP/2"
7 <nil> HTTP/2 
&{301 301 HTTP/2.0 2 0 map[Cache-Control:[public, max-age=2592000] Content-Length:[220] Content-Type:[text/html; charset=UTF-8] Date:[Mon, 15 Jun 2020 11:08:39 GMT] Expires:[Wed, 15 Jul 2020 11:08:39 GMT] Location:[https://www.google.com/] Server:[gws]] 0xc0000902c0 220 [] false false map[] 0xc0000f2000 <nil>} <nil>

Golang 解析原始 HTTP/2 響應

問題描述

1 個解決方案

解決方案1
2 2020-06-15 13:13:05

Golang 解析原始 HTTP/2 響應

問題描述

1 個解決方案

解決方案1 2 2020-06-15 13:13:05

解決方案1
2 2020-06-15 13:13:05