Node.js，Express，Jade - 错误：发送后无法设置标题

尝试使用Jade生成HTML页面时出现以下错误。有其他人遇到过这个问题吗？我在下面注意到错误的确切位置。Node.js，Express，Jade - 错误：发送后无法设置标题

错误

Error: Can't set headers after they are sent. 
    at ServerResponse.OutgoingMessage.setHeader (http.js:644:11) 
    at ServerResponse.res.setHeader (/Users/dereklo/node_modules/express/node_modules/connect/lib/patch.js:59:22) 
    at ServerResponse.res.set.res.header (/Users/dereklo/node_modules/express/lib/response.js:475:10) 
    at ServerResponse.res.contentType.res.type (/Users/dereklo/node_modules/express/lib/response.js:350:15) 
    at ServerResponse.res.send (/Users/dereklo/node_modules/express/lib/response.js:111:14) 
    at res.render.fn (/Users/dereklo/node_modules/express/lib/response.js:672:10) 
    at Object.exports.render (/Users/dereklo/node_modules/jade/lib/jade.js:216:5)

的Node.js /快递/玉源代码

var http = require('http'), 
    express = require('express'), 
    jade = require('jade'), 
    url = require('url'), 
    jsdom = require('jsdom'), 
    child_proc = require('child_process'), 
    w, 
    h, 
    scripts = ["/Users/dereklo/Node/pie/d3.min.js", 
       "/Users/dereklo/Node/pie/d3.v2.js", 
       "/Users/dereklo/Node/pie/d3.layout.min.js", 
       "/Users/dereklo/Node/pie/RadialScriptMobileServ.js", 
       "/Users/dereklo/Node/pie/RadialScriptMobile.js", 
       "/Users/dereklo/Node/pie/canvg.js"]; 

     //scripts = ["./d3.v2.js", 
     //   "./d3.layout.min.js", 
      //  "./pie.js"] 

    htmlStub = '<!DOCTYPE html><div id="RadialScriptMobileServ"></div>', 
    querystring = require("querystring"), 
    fs = require("fs"), 
    formidable = require("formidable"), 
    path = require('path'), 
    request = require('request') 
    svgsrc = ''; 



//create an app server 
var app = require('express').createServer(); 
//set path to the views (template) directory 
app.set('views', __dirname + '/views'); 
//set path to static files 
app.use(express.static(__dirname + '/../public')); 
//handle GET requests on/
app.get('/', function(req, res){ 



res.writeHead(200, {'Content-Type': 'text/plain'}); 

    w = (url.parse(req.url, true).query['width']); 
    h = (url.parse(req.url, true).query['height']); 

console.log("width: ",w); 
console.log("height: ",h); 

request("http://dcaps-staging.media.mit.edu:8080/api/reality_analysis_service/get_reality_analysis_data?document_key=radialData&bearer_token=8e2f9e3129", function (err, result, json) { 
    json = JSON.parse(json); 

    console.log("my radial data: ",json.radialData.data); 


    jsdom.env({features:{QuerySelector:true}, html:htmlStub, scripts:scripts, done:function(errors, window) { 

    svgsrc = window.insertRadial("#RadialScriptMobileServ",w,h,json).innerHTML; 
    console.log(svgsrc); 
     res.render('/Users/dereklo/Node/pie/Jade_radial.jade', {pageTitle: 'Franz Enzenhofer'}); // ERROR OCCURRING HERE! 


      // res.write(svgsrc); 
       res.end(); 

    }}) 
    }) 

}); 
//listen on localhost:3000 
app.listen(3000); 

//console.log('Pie SVG server running at http://127.0.0.1:3000/');

来源

2012-07-26 Apollo

我的问题是，我需要删除：

res.writeHead(200, {'Content-Type': 'text/plain'});

它现在完美地工作。我希望这将有助于其他人绊倒这个职位...

来源

2012-07-26 21:06:03 Apollo

你能做到的两种方式。无论是添加app.get（/ ..）这样上面的另一条路线：

// global controller 
app.get('/*',function(req,res,next){ 
    res.header('Content-Type': 'text/plain' , 0); 
    next(); // http://expressjs.com/guide.html#passing-route control 
});

或者你也可以到您现有的路由添加中间件功能

addToHeader = function (req, res, next) { 
    console.log("add to header called ... " + req.url); 
    res.header('Content-Type': 'text/plain', '0'); 
    next(); 
} 
and then change your routes to sth like this: 

app.get('/', addToHeader, function(req,res){ 
    var stuff = { 'title': 'blah' }; 
    res.render('mytemplate',stuff); 
});

来源

2012-07-26 19:32:47

当使用res.render（），你不需要手动处理响应（res.end（），res.writeHead（）等）。）。

来源

2012-09-06 10:28:26

Node.js，Express，Jade - 错误：发送后无法设置标题

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