本文介绍了node.js的http请求失败发送后无法设置标头的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我尝试使用https / http请求服务器并在网页中显示结果。
它作为服务器上的脚本工作但失败了,我用get请求返回结果。
I try to request a server with https/http and display the result in a web page.It's work as a script on a server but fail with i return the result with a get request.
var express = require('express');
var app = express();
var port = 1337;
var https = require('https');
app.get('/', function(req, response, next) {
doRequest(function(resp){
response.send("response" + resp); // FAIL ON REQUEST !
});
});
function doRequest(callback){
var post_data"query=test";
var post_options = {
host: 'mySite.com',
path: '/path/to/source',
method: 'POST',
secureProtocol: 'SSLv3_method'
};
// Set up the request
var post_req = https.request(post_options, function(res) {
res.setEncoding('utf8');
res.on('data', function (chunk) {
callback(chunk);
});
});
// post the data
post_req.write(post_data);
post_req.end();
}
doRequest(console.log); // WORKS !
我收到此错误:
http.js:707
throw new Error('Can\'t set headers after they are sent.');
^
Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (http.js:707:11)
at ServerResponse.res.set.res.header (/node_modules/express/lib/response.js:564:10)
at ServerResponse.res.contentType.res.type (/node_modules/express/lib/response.js:434:15)
at ServerResponse.res.send (/node_modules/express/lib/response.js:114:43)
我将Express 4与节点v0.10.15一起使用。
I use Express 4 with node v0.10.15.
推荐答案
JavaScript是异步的,所以
JavaScript is asynchronous so
// post the data
post_req.write(post_data);
post_req.end();
最有可能在执行之前执行
Will most likely be executed before
// Set up the request
var post_req = https.request(post_options, function(res) {
res.setEncoding('utf8');
res.on('data', function (chunk) {
callback(chunk);
});
});
结束,导致你的逻辑失败。
Is finished, causing your logic to fail.
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