[英]Reuse TCP connection with node-fetch in node.js
我正在使用這個 function 來調用外部 API
const fetch = require('node-fetch');
fetchdata= async function (result = {}) {
var start_time = new Date().getTime();
let response = await fetch('{API endpoint}', {
method: 'post',
body: JSON.stringify(result),
headers: { 'Content-Type': 'application/json' },
keepalive: true
});
console.log(response)
var time = { 'Respone time': + (new Date().getTime() - start_time) + 'ms' };
console.log(time)
return [response.json(), time];
}
The problem is that i am not sure that node.js is reusing the TCP connection to the API every time i use this function, eventhough i defined the keepalive property.
重復使用 TCP 連接可以顯着提高響應時間
任何建議都將受到歡迎。
如https://github.com/node-fetch/node-fetch#custom-agent中所述
const fetch = require('node-fetch');
const http = require('http');
const https = require('https');
const httpAgent = new http.Agent({ keepAlive: true });
const httpsAgent = new https.Agent({ keepAlive: true });
const agent = (_parsedURL) => _parsedURL.protocol == 'http:' ? httpAgent : httpsAgent;
const fetchdata = async function (result = {}) {
var start_time = new Date().getTime();
let response = await fetch('{API endpoint}', {
method: 'post',
body: JSON.stringify(result),
headers: { 'Content-Type': 'application/json' },
agent
});
console.log(response)
var time = { 'Respone time': + (new Date().getTime() - start_time) + 'ms' };
console.log(time)
return [response.json(), time];
}
這是基於 Ilan Frumer 的回答的node-fetch
添加keepAlive
選項的包裝器
// fetch: add option keepAlive with default true
const fetch = (function getFetchWithKeepAlive() {
const node_fetch = require('node-fetch');
const http = require('http');
const https = require('https');
const httpAgent = new http.Agent({ keepAlive: true });
const httpsAgent = new https.Agent({ keepAlive: true });
return async function (url, userOptions) {
const options = { keepAlive: true };
Object.assign(options, userOptions);
if (options.keepAlive == true)
options.agent = (parsedUrl => parsedUrl.protocol == 'http:' ? httpAgent : httpsAgent);
delete options.keepAlive;
return await node_fetch(url, options);
}
})();
const response = await fetch('https://github.com/');
const response = await fetch('https://github.com/', { keepAlive: false });
這是基於其文檔的 node-fetch 包裝器:
import nodeFetch, { RequestInfo, RequestInit } from "node-fetch";
import http from "http";
import https from "https";
const httpAgent = new http.Agent({
keepAlive: true
});
const httpsAgent = new https.Agent({
keepAlive: true
});
export const fetch = (url: RequestInfo, options: RequestInit = {}) => {
return nodeFetch(url, {
agent: (parsedURL) => {
if (parsedURL.protocol === "http:") {
return httpAgent;
} else {
return httpsAgent;
}
},
...options
});
};
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