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go - 为什么在 go1.16 上为传输配置 ReadIdleTimeout HTTP/2 选项？

问题描述

从google api golang 客户端，我们注意到

google-api-go-client/transport/http/configure_http2_go116.go

//go:build go1.16
// +build go1.16

...
// configureHTTP2 configures the ReadIdleTimeout HTTP/2 option for the
// transport. This allows broken idle connections to be pruned more quickly,
// preventing the client from attempting to re-use connections that will no
// longer work.
func configureHTTP2(trans *http.Transport) {
    http2Trans, err := http2.ConfigureTransports(trans)
    if err == nil {
        http2Trans.ReadIdleTimeout = time.Second * 31
    }
}

而在这个文件中google-api-go-client/transport/http/configure_http2_not_go116.go 

//go:build !go1.16
// +build !go1.16

// configureHTTP2 configures the ReadIdleTimeout HTTP/2 option for the
// transport. The interface to do this is only available in Go 1.16 and up, so
// this performs a no-op.
func configureHTTP2(trans *http.Transport) {}

Pernet/http2/transport.go是ConfigureTransport很久以前添加的。

// ConfigureTransport configures a net/http HTTP/1 Transport to use HTTP/2.
// It returns an error if t1 has already been HTTP/2-enabled.
//
// Use ConfigureTransports instead to configure the HTTP/2 Transport.
func ConfigureTransport(t1 *http.Transport) error {

为什么在 go1.16 上为传输配置 ReadIdleTimeout HTTP/2 选项？

标签： gogoogle-apihttp2

解决方案

在golang.org/x/net/http2包中有两个类似的探测函数，它们的作用非常不同：

func ConfigureTransport  (t1 *http.Transport) error
func ConfigureTransports (t1 *http.Transport) (*Transport, error)

我认为您将前者与后者混淆了。

来自问题跟踪器： https ://go-review.googlesource.com/c/net/+/264017

非常相似的名称是不幸的，但它们会在 godoc 中彼此相邻排序，并且复数的 ConfigureTransports 暗示了它的用途：它允许您配置 http 和 http2 传输。

ConfigureTransports仅在一年前推出：

commit 08b38378de702b893ee869b94b32f833e2933bd2
Author: Damien Neil <dneil@google.com>
Date:   Tue Oct 20 12:34:04 2020 -0700

    http2: add ConfigureTransports
    
    The ConfigureTransport function doesn't provide any way to get at the
    http2 Transport it creates, making it impossible to configure transport
    parameters such as ReadIdleTimeout.

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