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proxy/http: Avoid getting stuck when using server-first protocols

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PR #99 reduces an extra RTT when setting up the CONNECT tunnel
via http proxy, however, server-first protocols (such as MySQL)
will be unusable as v2ray keeps to wait for the client request.
This commit solves the problem by limiting the maximum waiting
time to 50 ms.
This commit is contained in:
lrh2000 2022-01-03 22:53:15 +08:00 committed by Shelikhoo
parent b4069f743c
commit 17d85263e2
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1 changed files with 17 additions and 7 deletions
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18
proxy/http/client.go
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@ -8,6 +8,7 @@ import (
"net/http"
"net/url"
"sync"
"time"
"golang.org/x/net/http2"
@ -79,14 +80,23 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
var user *protocol.MemoryUser
var conn internet.Connection
mbuf, _ := link.Reader.ReadMultiBuffer()
len := mbuf.Len()
firstPayload := bytespool.Alloc(len)
var firstPayload []byte
if reader, ok := link.Reader.(buf.TimeoutReader); ok {
// 0-RTT optimization for HTTP/2: If the payload comes within 50 ms, it can be
// transmitted together. Note we should not get stuck here, as the payload may
// not exist (considering to access MySQL database via a HTTP proxy, where the
// server sends hello to the client first).
if mbuf, _ := reader.ReadMultiBufferTimeout(50 * time.Millisecond); mbuf != nil {
mlen := mbuf.Len()
firstPayload = bytespool.Alloc(mlen)
mbuf, _ = buf.SplitBytes(mbuf, firstPayload)
firstPayload = firstPayload[:len]
firstPayload = firstPayload[:mlen]
buf.ReleaseMulti(mbuf)
defer bytespool.Free(firstPayload)
}
}
if err := retry.ExponentialBackoff(5, 100).On(func() error {
server := c.serverPicker.PickServer()