问题描述
这是我向 API 发出请求的代码:
This is my code to make a request to an API:
import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'package:http/http.dart' as http;
Future<http.Response> postRequest () async {
var url ='https://pae.ipportalegre.pt/testes2/wsjson/api/app/ws-authenticate';
var body = jsonEncode({ 'data': { 'apikey': '12345678901234567890' } });
print("Body: " + body);
http.post(url,
headers: {"Content-Type": "application/json"},
body: body
).then((http.Response response) {
print("Response status: ${response.statusCode}");
print("Response body: ${response.contentLength}");
print(response.headers);
print(response.request);
});
}
我对请求的响应有问题,假设它有一个带有 json 的正文,但出了点问题,我认为是我在正文请求中发送的 json,因为它是一个嵌套的 json 对象,key的值是一个json对象.我很想知道如何正确解析 json 并将其插入到请求正文中.
I have a problem with the response from the request, where its suppose to have a body with json, but something went wrong and i think is with the json that i send on the body request, because it is a nested json object, and the value of the key is a json object. i would love to know how i can parse the json right and insert into body of the request.
这是标头响应:
{set-cookie: JSESSIONID=DA65FBCBA2796D173F8C8D78AD87F9AD;path=/testes2/;HttpOnly, last-modified: Thu, 10 May 2018 17:15:13 GMT, cache-control: no-store, no-cache, must-revalidate, max-age=0, post-check=0, pre-check=0, date: Thu, 10 May 2018 17:15:13 GMT, content-length: 0, pragma: no-cache, content-type: text/html, server: Apache-Coyote/1.1, expires: Tue, 03 Jul 2001 06:00:00 GMT}
这是应该的:
Server: Apache-Coyote/1.1
Expires: Tue, 03 Jul 2001 06:00:00 GMT
Last-Modified: Thu, 10 May 2018 17:17:07 GMT
Cache-Control: no-store, no-cache, must-revalidate, max-age=0, post-check=0, pre-check=0
Pragma: no-cache
Content-Type: application/json;charset=UTF-8
Vary: Accept-Encoding
Set-Cookie: JSESSIONID=84813CC68E0E8EA6021CB0B4C2F245BC;path=/testes2/;HttpOnly
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
正文响应为空,我认为这是因为我在请求中发送了正文,有人可以帮助我处理嵌套的 json 对象的值吗??
the body response came empty and i think its because the body i sent on the request, can anyone help me with the nested json object in value??
推荐答案
好的,终于有答案了...
OK, finally we have an answer...
您正确指定了 headers: {"Content-Type": "application/json"},
来设置您的内容类型.在引擎盖下,包 http
或较低级别的 dart:io HttpClient
正在将其更改为 application/json;字符集=utf-8
.但是,您的服务器 Web 应用程序显然不需要后缀.
You are correctly specifying headers: {"Content-Type": "application/json"},
to set your content type. Under the hood either the package http
or the lower level dart:io HttpClient
is changing this to application/json; charset=utf-8
. However, your server web application obviously isn't expecting the suffix.
为了证明这一点,我在 Java 中尝试了两个版本
To prove this I tried it in Java, with the two versions
conn.setRequestProperty("content-type", "application/json; charset=utf-8"); // fails
conn.setRequestProperty("content-type", "application/json"); // works
您能否联系 Web 应用程序所有者以解释他们的错误?我看不到 Dart 在哪里添加后缀,但我稍后会查看.
Are you able to contact the web application owner to explain their bug? I can't see where Dart is adding the suffix, but I'll look later.
编辑后来的调查表明,它是 http
包,虽然为您做了很多繁重的工作,但添加了您的服务器不喜欢的后缀.如果您无法让他们修复服务器,那么您可以绕过 http
并直接使用 dart:io HttpClient
.您最终会得到一些通常由 http
为您处理的样板文件.
EDITLater investigation shows that it's the http
package that, while doing a lot of the grunt work for you, is adding the suffix that your server dislikes. If you can't get them to fix the server then you can by-pass http
and use the dart:io HttpClient
directly. You end up with a bit of boilerplate which is normally handled for you by http
.
以下工作示例:
import 'dart:convert';
import 'dart:io';
import 'dart:async';
main() async {
String url =
'https://pae.ipportalegre.pt/testes2/wsjson/api/app/ws-authenticate';
Map map = {
'data': {'apikey': '12345678901234567890'},
};
print(await apiRequest(url, map));
}
Future<String> apiRequest(String url, Map jsonMap) async {
HttpClient httpClient = new HttpClient();
HttpClientRequest request = await httpClient.postUrl(Uri.parse(url));
request.headers.set('content-type', 'application/json');
request.add(utf8.encode(json.encode(jsonMap)));
HttpClientResponse response = await request.close();
// todo - you should check the response.statusCode
String reply = await response.transform(utf8.decoder).join();
httpClient.close();
return reply;
}
根据您的用例,重用 HttpClient 可能更有效,而不是为每个请求不断创建一个新的.Todo - 添加一些错误处理 ;-)
Depending on your use case, it may be more efficient to re-use the HttpClient, rather than keep creating a new one for each request. Todo - add some error handling ;-)
这篇关于带有 Json 的 HTTP POST 正文 - Flutter/Dart的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!