在服务器端的Dart中，如何在HttpClient中设置头 [英] In Dart on server-side, how to set headers in HttpClient

问题描述

我试图使用Dart HttpClient类（io库/服务器端！），我不能想象如何做Dart（客户端）调用setRequestHeader的EQUIVALENT。

具体来说，我想按照此行将内容类型设置为application / json

（来自客户端）：

request.setRequestHeader（Content-type，application / json）;

我使用的格式：

  new HttpClient（）。postUrl（Uri.parse（url））
 .then（（HttpClientRequest request）=> request.close（））
 .then（（HttpClientResponse response）=> response。 transform（new Utf8Decoder（））。listen（_set_dbStats））; 
  

，当我尝试插入：

  .then（（HttpClientRequest request）=> request.head（Content-type，application / json））
  

我通知（在Dart编辑器中）head不是请求的方法...
我在API中看到它?!）这可能与它使用
作为POST相关吗？

提前感谢！

解决方案

Guenter Zoechbauer与我离线工作，离线获取这些骰子，我找不到任何例子1.服务器端，2. POST 3. HTTP命令使用标题，这种格式允许这个...

< pre class =lang-dart prettyprint-override> import'package：http / http.dart'as http;

String url =https://whatever.com;
return new http.Client（）
.post（url，headers：{'Content-type'：'application / json'}，
body：'{distinct：users ，key：account，query：{active：true}}'）
.whenComplete（（）=> print（'completed'））
.then （http.Response r）=> r.body）;
}


I am trying to use the Dart HttpClient class (io library / server-side!) and I can not think how to do the EQUIVALENT of the Dart (client-side) call to setRequestHeader.

Specifically I want to set "Content-type" to "application/json"

as per this line (from Client-side):

request.setRequestHeader("Content-type", "application/json");

I'm using the format:

new HttpClient().postUrl(Uri.parse(url))      
       .then((HttpClientRequest  request)  => request.close())
       .then((HttpClientResponse response) => response.transform(new Utf8Decoder()).listen(_set_dbStats));

and when I try to insert:

.then((HttpClientRequest  request) => request.head("Content-type", "application/json"))

I'm informed (in the Dart editor) that head is not a method for request... (although I see it in the API?!) Could this be related to it being used as a POST?

Thanks in advance!

解决方案

Here is a snippet of working code that evolved from numerous tests and dealing with some issues that were outside the scope of the original question.

Guenter Zoechbauer heroically worked with me off-line to get this dones, I could not find any examples of 1. Server Side, 2. POST 3. HTTP commands using Headers, this format permits this...

import 'package:http/http.dart' as http;

String url = "https://whatever.com";
return new http.Client()
   .post(url, headers: {'Content-type': 'application/json'},
    body: '{"distinct": "users","key": "account","query": {"active":true}}')
   .whenComplete(() => print('completed'))
   .then((http.Response r) => r.body);
}

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