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<h1 class="title-article" id="articleContentId">nodejs自带的请求方法--http.request</h1>
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<p>本文是接着前面的，用nodejs获取到本地文件的内容之后的操作。</p>
<p>当获取完本地文件的内容后，假设内容为相关的url链接，用ajax请求获取数据，这种方法是基于浏览器的，所以运行效率都是依赖于浏览器。</p>
<p>但是用nodejs也可以实现获取数据，并且是基于操作系统的，效率上远远超过浏览器方式。</p>
<p><a target="_blank" href="http://nodejs.cn/api/http.html#http_http_request_options_callback" rel="noopener noreferrer">本文使用的http.request()方法的API</a></p>
<p>下面来细说如何操作：</p>
<p>1.先声明一个通用方法来进行数据的请求</p>
<p></p>
<pre><code class="language-javascript">var http=require("http"); //导入需要的http库
function HttpRequest(option,callback){ //option设置请求的请求头，callback请求数据回调函数
var con=''; //存放请求后的数据
var req=http.request(option,function(res){ //http。request方法用于获取数据
res.setEncoding('utf-8'); //设置响应字符集
var resListener=setTimeout(function(){ //添加响应监听，20s后没有响应信息返回自动结束响应，并返回空数据
res.destroy(); //结束响应
con='';
callback(con);
},20000);
res.on('data',function(chuck){ //响应返回数据，并接受
if(chuck) con+=chuck;
}).on('end',function(){ //数据返回完毕
clearTimeout(resListener);
callback(con);
});
});
req.on('error',function(e){ //响应出错调用函数
console.log('错误为：'+e.message);
});
req.write(''); //发送请求
req.end(); //结束请求
}</code></pre>2.写一个方法调用上面的方法：
<p></p>
<p></p>
<pre><code class="language-javascript">function doEngine(data,callback){
var option={ //设置请求头信息
host:data.host, //域名
path:data.path, //资源地址
method:'GET', //请求方式
headers:{ //请求头信息
'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8',
'User-Agent':'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36'
}
}
HttpRequest(option,function(obj){
callback(obj);
});
}</code></pre>
<br /> 3.写一个主函数运行：
<p></p>
<p></p>
<pre><code class="language-javascript">function run(data){
if(data){
//data= ....(data); 对数据进行适当的处理
doEngine(data,function(obj){
if(obj){
//对返回的数据进行相应的处理，不细说，根据实际情况而定
}
});
}
}</code></pre>
<br /> 4.最后调用之前写的getContent()方法来获取要请求的请求头信息
<p></p>
<p><a target="_blank" href="http://blog.csdn.net/nh18304030935/article/details/77312213" rel="noopener noreferrer">nodeJS中大文件读写操作--Stream流</a></p>
<p></p>
<pre><code class="language-javascript">getContent(rs,run);</code></pre>
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<span class="info-block">10-25</span>
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<div class="desc ellipsis-online ellipsis-online-1">主要介绍了node.js中的<em>http</em>.<em>request</em><em>方法</em>使用说明,本文介绍了<em>http</em>.<em>request</em>的<em>方法</em>说明、语法、接收参数、使用实例和实现源码需要的朋友可以参考下</div>
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<div class="desc ellipsis-online ellipsis-online-1">有可能有这样的需求，需要node作为web服务器通过另外一台<em>http</em>/<em>http</em>s代理服务器发<em>http</em>或者<em>http</em>s<em>请求</em>，废话不多说直接上代码大家都懂的：
var <em>http</em> = require('<em>http</em>')
var opt = {
host:'这里放代理服务器的ip或者域名',
port:'这里放代理服务器的端口号',
method:'POST',//这里是发送的<em>方法</em>
path:' <em>http</em>s://www.google.com', //这里是访问的路径
headers:{
//这里放期望发送出去的<em>请求</em>头
}
}
//以下是接受<em>数据</em>的代码
var body = '';
var</div>
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<div class="left ellipsis-online ellipsis-online-1"><em>nodejs</em>使用<em>request</em>发送<em>http</em><em>请求</em></div>
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<div class="desc ellipsis-online ellipsis-online-1">在<em>nodejs</em>的开发中，有时需要后台去调用其他服务器的接口，这个时候，就需要发送<em>HTTP</em><em>请求</em>了。有一个简单的工具可以用，Simplified <em>HTTP</em> <em>request</em> client，可以比较方便的模拟<em>请求</em>。安装npm install <em>--</em>save <em>request</em>使用最简单的GET<em>请求</em>，用法如下：var <em>request</em> = require('<em>request</em>');
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函数的功能室作为客户端向<em>HTTP</em>服务器发起<em>请求</em>。
语法：
<em>http</em>.get(options, callback)
由于该<em>方法</em>属于<em>http</em>模块，使用前需要引入<em>http</em>模块（var <em>http</em>= require(“<em>http</em>”) ）
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var <em>http</em> = require('<em>http</em>')
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<div class="left ellipsis-online ellipsis-online-1">sqoop将Oracle<em>数据</em>接入到hive中中文乱码问题</div>
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<div class="desc ellipsis-online ellipsis-online-1">今天使用sqoop从Oracle中接入<em>数据</em>，有一个字段中文乱码，跟Oracle那边确认是UTF8格式编码。
于是开始进行转码：
1.convert(字段名,'ZHS16GBK','UTF8')
问题解决了。
2.其他编码格式还有US7ASCII
...</div>
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<div class="left ellipsis-online ellipsis-online-1"><em>Http</em><em>Request</em> （入门）</div>
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<div class="desc ellipsis-online ellipsis-online-1"><em>Request</em>学习
学习目标
1.能够使用<em>Request</em>对象获取<em>HTTP</em>协议<em>请求</em>内容(掌握)(包含<em>请求</em>行、<em>请求</em>头、<em>请求</em>体的信息)
2.能够处理<em>HTTP</em><em>请求</em>参数的乱码问题 (掌握)
3.能够使用<em>Request</em>域对象 (掌握)
4.能够使用<em>Request</em>对象做<em>请求</em>转发(掌握)
5.能够完成登录案例
6.能够理解相对路径和绝对路径(了解)
第1章 <em>request</em>对象获取<em>请求</em>信息
1.1 <em>request</em>对...</div>
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<div class="left ellipsis-online ellipsis-online-1"><em>nodejs</em> 使用的一些<em>http</em>网络<em>请求</em>模块</div>
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<div class="desc ellipsis-online ellipsis-online-1"><em>http</em>
大部分的node使用者，都是用node来做Web API的，而<em>HTTP</em>模块是提供Web API的基础。为了支持所有的<em>HTTP</em>应用，node中的HTTTP模块提供的API是偏向底层化的。利用<em>HTTP</em>模块，我们可以简单快速搭建一个Web Server。
node提供了<em>http</em>这个核心模块（不用安装哦，直接require就可以了），用于创建<em>http</em> server服务,使用下面代码，轻松在本机的...</div>
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<div class="desc ellipsis-online ellipsis-online-1">1、引入相关模块
使用<em>http</em> <em>request</em>时必须先引入<em>http</em>和querystring模块，如下：
// 引入相关模块
var <em>http</em> = require('<em>http</em>')
var querystring = require('querystring')
2、使用
get<em>请求</em>
// 需要提交的<em>数据</em>
var data = {
a: 111,
time: Date.now()
}
var d...</div>
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<div class="left ellipsis-online ellipsis-online-1"><em>nodejs</em>将<em>http</em>.<em>request</em><em>请求</em>封装成模块</div>
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<div class="desc ellipsis-online ellipsis-online-1"><em>nodejs</em>将<em>http</em>.<em>request</em><em>请求</em>封装成模块
服务端代码
server.js：
const express = require('express');
const urlencoded = express.urlencoded;
const json = express.json;
const app = express();
app.use(json());
app.use(urlencoded({extended:false}));
app.post('/', function(req, r</div>
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<div class="left ellipsis-online ellipsis-online-1">js里使用<em>Request</em>()</div>
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<a href="https://blog.csdn.net/weixin_34239169" target="_blank"><span class="blog-title">weixin_34239169的博客</span></a>
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<span class="info-block time">04-24</span>
<span class="info-block read"><img class="read-img" src="https://csdnimg.cn/release/blogv2/dist/pc/img/readCountWhite.png" alt="">
2253
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<a href="https://blog.csdn.net/weixin_34239169/article/details/92852919" target="_blank" data-report-click='{"ab":"new","spm":"1001.2101.3001.6650.15","mod":"popu_387","extra":"{\"highlightScore\":0.0,\"utm_medium\":\"distribute.pc_relevant.none-task-blog-2~default~BlogCommendFromBaidu~Rate-15.pc_relevant_paycolumn_v3\",\"dist_request_id\":\"1651051593477_31971\"}","dist_request_id":"1651051593477_31971","ab_strategy":"paycolumn","index":"15","strategy":"2~default~BlogCommendFromBaidu~Rate","dest":"https://blog.csdn.net/weixin_34239169/article/details/92852919"}' data-report-query='spm=1001.2101.3001.6650.15&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-15.pc_relevant_paycolumn_v3&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-15.pc_relevant_paycolumn_v3'>
<div class="desc ellipsis-online ellipsis-online-1">function<em>Request</em>(strName)
{
varstrHref=window.document.location.href;
varintPos=strHref.indexOf("?");
varstrRight=strHref.substr(intPos+1);
vararrTmp=strRight....</div>
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<div class="left ellipsis-online ellipsis-online-1">解决<em>nodejs</em>通过<em>http</em><em>请求</em>返回<em>数据</em>不完整的问题</div>
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<div class="desc ellipsis-online ellipsis-online-1">解决方案：用变量存储返回的<em>数据</em>即可，参考这位佬的操作<传送门！>
原理：具体理由还不懂，后续得找个时间高强度网上冲浪弄明白
贴上出问题的代码
let push = (postData, callback) => {
const req = <em>http</em>.<em>request</em>(options_push, (res) => {
res.setEncoding('utf8')
res.on('data', (chunk) => {
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<div class="left ellipsis-online ellipsis-online-1">node使用<em>request</em><em>请求</em>的<em>方法</em></div>
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<div class="desc ellipsis-online ellipsis-online-1">近期使用node做服务端渲染，作为中间层需要<em>请求</em>后端接口，需要封装服务端的<em>请求</em>，接下来来了解下如何使用 <em>request</em>。
基本使用
const <em>request</em> = require('<em>request</em>')
引入这个包就可以开始使用了，最简单的使用方式就是 <em>request</em>(url) 就可以想指定的地址发起一个 get <em>请求</em>。 从这里我们可以看出 <em>request</em> 暴露出来的就是一个函数。其实它内部的结构如下
function <em>request</em> (uri, options, callback) {
if (typeof uri === 'undefined') {
throw new Error(</div>
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<div class="left ellipsis-online ellipsis-online-1">node.js中的<em>http</em>.<em>request</em><em>方法</em>使用说明_node.js</div>
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<div class="desc ellipsis-online ellipsis-online-1"><em>方法</em>说明：函数的功能室作为客户端向<em>HTTP</em>服务器发起<em>请求</em>。语法：复制代码 代码如下:<em>http</em>.get(options, callback)由于该<em>方法</em>属于<em>http</em>模块，使用前需要引入<em>http</em>模块（var <em>http</em>= require(“<em>http</em>”) ）接收参数：option 数组对象，包含以下参数： host: 表示<em>请求</em>网站的域名或IP地址（<em>请求</em>的地址）。 ...</div>
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