Javascript “错误”；can'；t在发送后设置标题"；

我正在尝试编写一个node.js应用程序，使用omdb api获取电影列表。 当我尝试请求

/result

路线时，我得到以下错误：

Error: Can't set headers after they are sent.
    at validateHeader (_http_outgoing.js:494:11)
    at ServerResponse.setHeader (_http_outgoing.js:501:3)
    at ServerResponse.header (/home/cabox/workspace/APIs/movie_search_app/node_modules/express/lib/response.js:767:10)
    at ServerResponse.contentType (/home/cabox/workspace/APIs/movie_search_app/node_modules/express/lib/response.js:595:15)
    at ServerResponse.send (/home/cabox/workspace/APIs/movie_search_app/node_modules/express/lib/response.js:145:14)
    at Request._callback (/home/cabox/workspace/APIs/movie_search_app/app.js:18:13)
    at Request.self.callback (/home/cabox/workspace/APIs/movie_search_app/node_modules/request/request.js:186:22)
    at emitTwo (events.js:126:13)
    at Request.emit (events.js:214:7)
    at Request.<anonymous> (/home/cabox/workspace/APIs/movie_search_app/node_modules/request/request.js:1163:10)

---

真诚地希望有人能提供一些指导，帮助您处理/解决此错误。

您已经发送了一个字符串作为响应，稍后尝试将呈现的页面发送给客户端，但此操作不起作用

app.get("/results", function(req, res){
  [...]     
  if (!error && response.statusCode ==200) {      
    [...]
    // HERE IS YOUR PROBLEM
    res.send(results.search(0).title);
    res.render("results", {data: data});
  }  
});

---

您已经发送了一个字符串作为响应，稍后尝试将呈现的页面也发送到客户端，但客户端不工作

app.get("/results", function(req, res){
  [...]     
  if (!error && response.statusCode ==200) {      
    [...]
    // HERE IS YOUR PROBLEM
    res.send(results.search(0).title);
    res.render("results", {data: data});
  }  
});

---

@moneydhaze感谢您的回复。你让我彻底检查了代码，然后简单地启动。看来res.send和res.render是冲突的。当我拿出res.render并简化代码时；成功了。请参见下面的简化代码：

var express = require("express");
var app = express();

var request = require("request");

app.set("view engine", "ejs")


app.get("/", function(req, res){
  res.send("This is the Home Page")
});


app.get("/results", function(req, res){
    request("http://www.omdbapi.com/?s=guardians+of+the+galaxy&apikey=thewdb", function(error, response, body){
      if (!error && response.statusCode ==200){
        res.send(body);
      }  
    })
});


app.listen(3000,function(){
  console.log("Movie App has started!!!");
});

---

@感谢您的回复。你让我彻底检查了代码，然后简单地启动。看来res.send和res.render是冲突的。当我拿出res.render并简化代码时；成功了。请参见下面的简化代码：

var express = require("express");
var app = express();

var request = require("request");

app.set("view engine", "ejs")


app.get("/", function(req, res){
  res.send("This is the Home Page")
});


app.get("/results", function(req, res){
    request("http://www.omdbapi.com/?s=guardians+of+the+galaxy&apikey=thewdb", function(error, response, body){
      if (!error && response.statusCode ==200){
        res.send(body);
      }  
    })
});


app.listen(3000,function(){
  console.log("Movie App has started!!!");
});

可能的重复可能的重复