dart：io中具有json内容类型的Http POST请求 [英] Http POST request with json content-type in dart:io

问题描述

如何使用控制台dart应用程序执行HTTP POST（使用 dart：io 或可能是 package：http

How to perform HTTP POST using the console dart application (using dart:io or may be package:http library. I do something like that:

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

  http.post(
    url,
    headers: {HttpHeaders.CONTENT_TYPE: "application/json"},
    body: {"foo": "bar"})
      .then((response) {
        print("Response status: ${response.statusCode}");
        print("Response body: ${response.body}");
      }).catchError((err) {
        print(err);
      });

，但出现以下错误：

Bad state: Cannot set the body fields of a Request with content-type "application/json".

推荐答案

来自 http.dart ：

/// [body] sets the body of the request. It can be a [String], a [List<int>] or
/// a [Map<String, String>]. If it's a String, it's encoded using [encoding] and
/// used as the body of the request. The content-type of the request will
/// default to "text/plain".

因此您自己生成JSON主体（使用 JSON.encode ：转换）。

So generate the JSON body yourself (with JSON.encode from dart:convert).

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