go - 每次请求后关闭 http2 客户端连接

Question

我想在每次请求后关闭 http2 客户端连接(比如在 http1.1 中禁用保持连接)。我尝试添加标题 Connection: close但这给了
http2:客户端连接不可用错误。

我尝试使用 request.Close = true 以及在文档中指定，但仍然出现错误。

以下是我正在使用的代码片段:

func main() {

    enableCompression := false

    transport2 := &http2.Transport{
        DisableCompression: !enableCompression,
        AllowHTTP:          true,
        DialTLS: func(network, addr string, cfg *tls.Config) (net.Conn, error) {
            return net.Dial(network, addr)
        },
    }

    // Create http client
    client := http.Client{
        Transport: transport2,
        Timeout:   time.Duration(1 * time.Second),
    }

    var err error
    var request *http.Request
    if request, err = createRequest(); err == nil {
        request.Close = true
        var response *http.Response

        if response, err = client.Do(request); err == nil {
            fmt.Println(response)
        } else {
            fmt.Println("error: ", err)
        }
    }
}

func createRequest() (request *http.Request, err error) {
    if request, err = http.NewRequest("GET", "http://0.0.0.0:1010/hello/sayHello", nil); err == nil {
        fmt.Println(request)
    }
    return
}

这给出了错误:
http2:客户端连接不可用(等待 header 时超出 Client.Timeout)

我错过了什么？

Answer 1

HTTP/2 不允许这种行为。

https://httpwg.org/specs/rfc7540.html#rfc.section.8.1.2

8.1.2.2. Connection-Specific Header Fields

HTTP/2 does not use the Connection header field to indicate connection-specific header fields; in this protocol, connection-specific metadata is conveyed by other means. [...]

[...]

This means that an intermediary transforming an HTTP/1.x message to HTTP/2 will need to remove any header fields nominated by the Connection header field, along with the Connection header field itself. Such intermediaries SHOULD also remove other connection-specific header fields, such as Keep-Alive, Proxy-Connection, Transfer-Encoding, and Upgrade, even if they are not nominated by the Connection header field.

也可以看看

https://github.com/golang/go/issues/22441

https://github.com/golang/go/issues/17717