te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>javascript - Node.js http.request keepAlive - Stack Overflow

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    javascript - Node.js http.request keepAlive - Stack Overflow

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    I'm trying to use http.Agent({ keepAlive: true}) on http.request to keep the connection open for future requests.

    I created a simple server to log each new connection but when i run my request.js the server logs two new connections.

    How can i use the HTTP keep-alive with Node.js native modules?

    request.js:

    const http = require("http");

const agent = new http.Agent({
    keepAlive: true
});

var req1 = http.request({
    agent: agent,
    method: "GET",
    hostname: "localhost",
    port: 3000
}, function (res1) {
    console.log("REQUEST_1");

    var req2 = http.request({
        agent: agent,
        method: "GET",
        hostname: "localhost",
        port: 3000
    }, function (res2) {
        console.log("REQUEST_2");
    });

    req2.end();
});

req1.end();

    server.js:

    const http = require('http');

var server = http.createServer(function (req, res) {
    res.end('OK');
    console.log("REQUEST");
})

server.on('connection', function (socket) {
    console.log("NEW CONNECTION");
})

server.listen(3000);

    output:

    NEW CONNECTION
REQUEST
NEW CONNECTION
REQUEST

    I'm trying to use http.Agent({ keepAlive: true}) on http.request to keep the connection open for future requests.

    I created a simple server to log each new connection but when i run my request.js the server logs two new connections.

    How can i use the HTTP keep-alive with Node.js native modules?

    request.js:

    const http = require("http");

const agent = new http.Agent({
    keepAlive: true
});

var req1 = http.request({
    agent: agent,
    method: "GET",
    hostname: "localhost",
    port: 3000
}, function (res1) {
    console.log("REQUEST_1");

    var req2 = http.request({
        agent: agent,
        method: "GET",
        hostname: "localhost",
        port: 3000
    }, function (res2) {
        console.log("REQUEST_2");
    });

    req2.end();
});

req1.end();

    server.js:

    const http = require('http');

var server = http.createServer(function (req, res) {
    res.end('OK');
    console.log("REQUEST");
})

server.on('connection', function (socket) {
    console.log("NEW CONNECTION");
})

server.listen(3000);

    output:

    NEW CONNECTION
REQUEST
NEW CONNECTION
REQUEST
    • javascript
    • node.js
    • http
    Share Improve this question asked May 22, 2019 at 10:42 isflaviorisflavior 1402 gold badges4 silver badges9 bronze badges
    Add a ment  | 

    4 Answers 4

    Reset to default 6

    Set maxSockets options like this:

    const agent = new http.Agent({
    keepAlive: true,
    maxSockets: 1
});

    By default maxSockets is set to Infinity - https://nodejs/api/http.html#http_new_agent_options

    Full example on node v10

    const http = require("http");

const agent = new http.Agent({
    keepAlive: true,
    maxSockets: 1
});

var req1 = http.request({
    agent: agent,
    method: "GET",
    hostname: "localhost",
    port: 3000
}, function (res1) {
    console.log("REQUEST_1");

    res1.on('data', function () {
        console.log("REQUEST_1 data");
    });

    res1.on('end', function () {
        console.log("REQUEST_1 end");
    });

    var req2 = http.request({
        agent: agent,
        method: "GET",
        hostname: "localhost",
        port: 3000
    }, function (res2) {
        console.log("REQUEST_2");

        res2.on('data', function () {
            console.log("REQUEST_2 data");
        });

        res2.on('end', function () {
            console.log("REQUEST_2 end");
        });
    });
    req2.end();
});
req1.end();

    Starting with Node.js v19, the keepAlive option is set to true by default for all outgoing HTTP(s)/1.1 connections.

    You can read more about it on Node.js's v19 documentation.

    The accepted answer doesn't make clear that the code posted will allow only one request simultaneously per host per thread.

    That is usually not what you want and will lead to requests slowing down waiting for the previous one to plete.

    your demo not set res1's on data listener ,it will cause the socket not be close ,so the second request have to create a new connect to server ,just add a data listener

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