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perf: use Pool instead of Client in ProxyAgent for HTTP proxy connections #4359

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perf: use Pool instead of Client in ProxyAgent for HTTP proxy connections #4359

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12 changes: 7 additions & 5 deletions lib/dispatcher/proxy-agent.js
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Original file line number Diff line number Diff line change
@@ -1,13 +1,12 @@
'use strict'

const { kProxy, kClose, kDestroy, kDispatch, kConnector } = require('../core/symbols')
const { kProxy, kClose, kDestroy, kDispatch } = require('../core/symbols')
const { URL } = require('node:url')
const Agent = require('./agent')
const Pool = require('./pool')
const DispatcherBase = require('./dispatcher-base')
const { InvalidArgumentError, RequestAbortedError, SecureProxyConnectionError } = require('../core/errors')
const buildConnector = require('../core/connect')
const Client = require('./client')

const kAgent = Symbol('proxy agent')
const kClient = Symbol('proxy client')
Expand All @@ -29,6 +28,7 @@ const noop = () => {}

class ProxyClient extends DispatcherBase {
#client = null
#connector = null
constructor (origin, opts) {
if (typeof origin === 'string') {
origin = new URL(origin)
Expand All @@ -40,7 +40,9 @@ class ProxyClient extends DispatcherBase {

super()

this.#client = new Client(origin, opts)
// Store the connector for direct socket connections
this.#connector = opts?.connect || buildConnector(opts)
this.#client = new Pool(origin, opts)
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@caitp caitp Jul 24, 2025 •
edited
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the new Http1ProxyWrapper does this, although looking at the diff it's kind of clumbsy how it does it -- but the default factory it uses will make a Pool unless opts.connections === 1, which is pulled from the regular Agent factory.

I did switch to using a user supplied factory in order to get MockAgent tests passing, though. maybe it is a good simplification to just always create a Pool, though

}

async [kClose] () {
Expand All @@ -54,7 +56,7 @@ class ProxyClient extends DispatcherBase {
async [kDispatch] (opts, handler) {
const { method, origin } = opts
if (method === 'CONNECT') {
this.#client[kConnector]({
this.#connector({
origin,
port: opts.port || defaultProtocolPort(opts.protocol),
path: opts.host,
Expand Down Expand Up @@ -121,7 +123,7 @@ class ProxyAgent extends DispatcherBase {
if (origin.protocol === 'http:') {
return new ProxyClient(origin, options)
}
return new Client(origin, options)
return new Pool(origin, options)
}
: undefined

Expand Down
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