node.js错误-发送后不能发送标头
node.js错误-发送后不能发送标头
提问于 2014-05-28 12:25:29
我正在为node.js使用ebay-api，当我出于某种原因刷新页面时，控制台中出现了一个错误：
发送后无法发送标头
这是我的代码，有人能帮我理解为什么我在刷新页面时会出现错误吗？
// example simple request to FindingService:findItemsByKeywords
var ebay = require('../index.js');
var http = require('http');
var express = require('express');
var app = express();
var io = require('socket.io');
app.set('port', process.env.PORT || 5000);
app.get('/getEbay', function (req, res) {
console.log('inside get');
// for avoiding crossbrowser-error
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization');
res.header('Content-Type', 'application/json');
var params = {};
params.keywords = ["cat"];
params['paginationInput.entriesPerPage'] = 10;
ebay.ebayApiGetRequest({
serviceName: 'FindingService',
opType: 'findItemsByKeywords',
appId: 'MYAPPID', // FILL IN YOUR OWN APP KEY, GET ONE HERE: https://publisher.ebaypartnernetwork.com/PublisherToolsAPI
params: params,
// filters: filters,
parser: ebay.parseItemsFromResponse // (default)
},
// gets all the items together in a merged array
function ebayApiGetRequest(error, items) {
if (error) throw error;
console.log('Found', items.length, 'items');
// res.send(items);
console.log(JSON.stringify(items));
res.contentType('application/json');
res.send(JSON.stringify(items));
// }
}
);
});
http.createServer(app).listen(app.get('port'), function(){
console.log('Express server listening on port ' + app.get('port'));
});
console.log('Listening on port 5000...');我认为我的错误可能在调用函数的顺序上，或者有办法避免这个错误的调用？
回答 3
Stack Overflow用户
回答已采纳
发布于 2014-05-28 12:53:49
而不是这样：
res.send(JSON.stringify(items));
res.send(items);试着：
res.end(JSON.stringify(items));Stack Overflow用户
发布于 2014-05-28 12:46:38
function ebayApiGetRequest(error, items) {
if (error) throw error;
console.log('Found', items.length, 'items');
// res.send(items);
console.log(JSON.stringify(items));
res.contentType('application/json');
res.send(JSON.stringify(items));// you send here
res.send(items);//and you send again right afterwards?
// }
}如果您实际执行了两次发送，那么当然要发送两次数据。其中一个res.send()就足够了。
Stack Overflow用户
发布于 2014-05-28 13:36:11
伙计们，我们解决了问题！
下面是正在运行的新代码：
// example simple request to FindingService:findItemsByKeywords
var http = require('http');
var express = require('express');
var app = express();
var io = require('socket.io');
var ebay = require('../index.js');
app.set('port', process.env.PORT || 5000);
app.get('/getEbay', function(req, res) {
console.log('inside get');
// for avoiding crossbrowser-error
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization');
res.header('Content-Type', 'application/json');
getEbaybyResults(function(error, items) {
if (error) throw error;
console.log('Found', items.length, 'items');
// res.send(items);
console.log(JSON.stringify(items));
// res.contentType('application/json');
// console.log(try);
// res.send(JSON.stringify(items));
res.end(JSON.stringify(items));
});
});
function getEbaybyResults(callback) {
var params = {};
params.keywords = ["cat"];
params['paginationInput.entriesPerPage'] = 10;
ebay.ebayApiGetRequest(
{
serviceName: 'FindingService',
opType: 'findItemsByKeywords',
appId: 'MYAPPID', // FILL IN YOUR OWN APP KEY, GET ONE HERE: https://publisher.ebaypartnernetwork.com/PublisherToolsAPI
params: params,
// filters: filters,
parser: ebay.parseItemsFromResponse // (default)
},
function(error, items) {
callback(error, items);
}
);
//ebayApiGetRequest();
}
http.createServer(app).listen(app.get('port'), function(){
console.log('Express server listening on port ' + app.get('port'));
});
//console.log('Listening on port 5000...');页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/23911549
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