blocks|key|5526593|text|转到pubspec.yaml文件，并添加http依赖项：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5526594|dependencies:
++flutter:
++++sdk:+flutter

++cupertino_icons:+%5E0.1.2
++http:+any|code-block|syntax|javascript|5526595|请记住，缩进必须与'flutter‘或'cupertino_icons’相同|5526596|别忘了在你的终端上运行这个命令：|5526597|flutter+packages+get|5526598|entityMap^0|2|C|K|4|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

Go to your <code>pubspec.yaml</code> file , and add the <code>http</code> dependency:

<pre><code>dependencies:
 flutter:
 sdk: flutter

 cupertino_icons: ^0.1.2
 http: any
</code></pre>

Remember, the indentation must be the same as 'flutter' or 'cupertino_icons'

And don't forget to run this command in your terminal :

<pre><code>flutter packages get
</code></pre>

blocks|key|1616143|text|我也有同样的问题。只需在pubspec.yaml中添加最新的http依赖项|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1616144|这是完整的代码，|1616145|++dependencies:
++++++flutter:
++++++++sdk:+flutter

++++++http:+%5E0.12.0%2B1

++++++#+The+following+adds+the+Cupertino+Icons+font+to+your+application.
++++++#+Use+with+the+CupertinoIcons+class+for+iOS+style+icons.
++++++cupertino_icons:+%5E0.1.2|code-block|syntax|javascript|1616146|别忘了更改版本号。要检查http的最新版本，请单击here|1616147|如果你直接从命令行运行app，你也可以这样做：|1616148|使用Flutter：|1616149|$+flutter+packages+get|1616150|使用pub：|1616151|$+pub+get|1616152|entityMap|0|LINK|mutability|MUTABLE|url|https://pub.dartlang.org/packages/http#-installing-tab-^0|C|C|0|0|0|P|4|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|19|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|O|3|P|5|6|7|1F|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1G|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1H|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1I|8|@]|D|@]|E|$]]|$1|W|3|X|5|J|7|1J|8|@]|D|@]|E|$K|L]]|$1|Y|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]]]

I had the same problem. You just have to add latest http dependencies in <code>pubspec.yaml</code>

Here is the full code,

<pre><code> dependencies:
 flutter:
 sdk: flutter

 http: ^0.12.0+1

 # The following adds the Cupertino Icons font to your application.
 # Use with the CupertinoIcons class for iOS style icons.
 cupertino_icons: ^0.1.2
</code></pre>

Don't forget to change verson no. of http
To check latest version of http click <a href="https://pub.dartlang.org/packages/http#-installing-tab-" rel="noreferrer">here</a>

If you are running app directly from command line then you could also do:

with Flutter:

<pre><code>$ flutter packages get
</code></pre>

with pub:

<pre><code>$ pub get
</code></pre>

blocks|key|1998402|text|我发现，在VS+Code中，您可能需要重新启动编辑器才能看到'pub+get‘引入的新http模块。您的.dart代码和pubspec.yaml可以完全正确，但仍然会出现编译器/lint错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1998403|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I've found that, when in VS Code, you might need to restart the editor to get it to see the new http module that 'pub get' pulled in. You can have your .dart code and pubspec.yaml exactly right but you still get the compiler/lint error.

blocks|key|1619418|text|您需要像这样导入：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1619419|import+'package:http/http.dart'+as+http;|code-block|syntax|javascript|1619420|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You need to import like this:

<pre><code>import 'package:http/http.dart' as http;
</code></pre>

blocks|key|1619306|text|将以下内容添加到pubspec.ymel文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1619307|dependencies:
++flutter:
++++sdk:+flutter

++cupertino_icons:+%5E0.1.2
++http:+%5E0.12.0%2B1|code-block|syntax|javascript|1619308|使用flutter+pub查找最新版本|offset|length|1619309|打电话|1619310|flutter+packages+get|1619311|entityMap|0|LINK|mutability|MUTABLE|url|https://pub.dartlang.org/packages/http^0|0|0|A|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@$I|Z|J|10|1|11]]|A|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

add below to pubspec.ymel file

<pre><code>dependencies:
 flutter:
 sdk: flutter

 cupertino_icons: ^0.1.2
 http: ^0.12.0+1
</code></pre>

use flutter <a href="https://pub.dartlang.org/packages/http" rel="nofollow noreferrer">pub</a> to find the latest version

call 

<pre><code>flutter packages get
</code></pre>

blocks|key|5526679|text|刚进入pubspec.yaml文件并调整了文件中的一些更改|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5526680|dependencies:
++flutter:
++++sdk:+flutter

++cupertino_icons:+%5E0.1.2

+http:+++|code-block|syntax|javascript|5526681|在依赖项部分，只需添加http，就像在代码描述中一样。|5526682|flutter将自动解决它，并将添加更新版本的http。|5526683|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

just got to pubspec.yaml file and tweak some changes in file 

<pre><code>dependencies:
 flutter:
 sdk: flutter

 cupertino_icons: ^0.1.2

 http: 

</code></pre>

under dependencies section just add http like in code description .

flutter will automatically resolve it and will add updated version of http .

blocks|key|1616242|text|您需要在pubspec.yaml文件中添加http依赖，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1616243|dependencies:
++flutter:
++++sdk:+flutter

++cupertino_icons:+%5E0.1.2
++http:+%5E0.12.0%2B2|code-block|syntax|javascript|1616244|请注意缩进。完成上述操作后，在您的终端中运行以下命令：|1616245|flutter+packages+get|1616246|在写这篇文章的时候，最新的http版本是0.12.0%2B2。你可以通过访问这个link了解更多。|1616247|entityMap|0|LINK|mutability|MUTABLE|url|https://pub.dev/packages/http#-installing-tab-^0|4|C|0|0|0|0|12|4|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@]|D|@$9|15|A|16|1|17]]|E|$]]|$1|Q|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

You have to add the http dependency in the <code>pubspec.yaml</code> file as shown below:

<pre><code>dependencies:
 flutter:
 sdk: flutter

 cupertino_icons: ^0.1.2
 http: ^0.12.0+2
</code></pre>

Please take note of the indentation. After doing the above, run the below command in your terminal:

<pre><code>flutter packages get
</code></pre>

As at the time of writing this, the latest http version is 0.12.0+2. You can learn more by visiting this <a href="https://pub.dev/packages/http#-installing-tab-" rel="nofollow noreferrer">link</a>.

blocks|key|1619298|text|这对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1619299|dependencies:
++flutter:
++++sdk:+flutter

++cupertino_icons:+%5E0.1.2
++http:+any|code-block|syntax|javascript|1619300|然后：|1619301|flutter+doctor+-v|1619302|最后：|1619303|flutter+packages+get|1619304|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

this worked for me:

<pre><code>dependencies:
 flutter:
 sdk: flutter

 cupertino_icons: ^0.1.2
 http: any
</code></pre>

then:

<pre><code>flutter doctor -v
</code></pre>

Finally:

<pre><code>flutter packages get
</code></pre>

blocks|key|1998482|text|1.将以下内容添加到软件包的pubspec.yaml文件中：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1998483|dependencies:++++http:+%5E0.12.1|CODE|1998484|2.安装:|1998485|$+flutter+pub+get|1998486|Dart+3.现在可以在Dart代码中使用：|1998487|import+'package:http/http.dart'+as+http;|1998488|entityMap^0|0|U|0|0|U|0|0|5|0|0|H|0|0|0|14|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|K|3|L|5|6|7|11|8|@$9|12|A|13|B|H]]|D|@]|E|$]]|$1|M|3|N|5|6|7|14|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|15|8|@$9|16|A|17|B|H]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|R|$]]

1. Add this to your package's pubspec.yaml file:

<code>dependencies:
 http: ^0.12.1</code>

2. install it : 

<code>$ flutter pub get</code>

3. Now in your Dart code, you can use:

<code>import 'package:http/http.dart' as http;</code>

blocks|key|1998545|text|将以下内容添加到pubspec.yaml文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1998546|++dependencies:
++http:+%5E0.12.0%2B1|code-block|syntax|javascript|1998547|或者只添加http|1998548|dependencies:
http:|1998549|flutter将自动使用最新版本的http。|1998550|然后使用pub+|1998551|+|blockquote|1998552|1998553|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|10|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

<h2>Add below to pubspec.yaml file</h2>
<pre><code> dependencies:
 http: ^0.12.0+1
 
</code></pre>
Or Just add http
<pre><code>dependencies:
http:
</code></pre>
flutter will automatically used latest version of http .
<blockquote>
Then use pub get
</blockquote>

blocks|key|1998585|text|版本:+1.0.0%2B1|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1998586|环境:+sdk：">=2.7.0+<3.0.0“|1998587|依存关系:+flutter:+sdk:+flutter|1998588|cupertino_icons：%5E1.0.0+http：%5E0.12.2|1998589|dev_dependencies:+flutter_test:+sdk:+flutter|1998590|颤动：|1998591|用途-材料-设计:真实资产：-图像/|1998592|尝试更新sdk版本，然后使用pub+get或flutter+pub+get来安装软件包|1998593|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|W|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|Y|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|Q|$]]

version: 1.0.0+1
environment:
sdk: &quot;&gt;=2.7.0 &lt;3.0.0&quot;
dependencies:
flutter:
sdk: flutter
cupertino_icons: ^1.0.0
http: ^0.12.2
dev_dependencies:
flutter_test:
sdk: flutter
flutter:
uses-material-design: true
assets:
- images/
try to update the sdk versions and then pub get or flutter pub get to get the packages get install

blocks|key|1998648|text|只需添加pubspec.yaml即可|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1998649|http:+%5E0.12.0%2B2|code-block|syntax|javascript|1998650|就像as|1998651|dependencies:
++flutter:
++++sdk:+flutter
++cupertino_icons:+%5E0.1.3
++http:+%5E0.12.0%2B2|1998652|并在终端中运行|1998653|flutter+pub+get|1998654|最后添加类|1998655|import+'package:http/http.dart'+as+http;|1998656|entityMap^0|0|G|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|16|8|@]|D|@]|E|$]]|$1|U|3|V|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|W|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|X|$]]

just add in pubspec.yaml
<pre><code>http: ^0.12.0+2
</code></pre>
like as
<pre><code>dependencies:
 flutter:
 sdk: flutter
 cupertino_icons: ^0.1.3
 http: ^0.12.0+2
</code></pre>
and run in terminal
<pre><code>flutter pub get
</code></pre>
finally add in class
<pre><code>import 'package:http/http.dart' as http;
</code></pre>

blocks|key|4108873|text|首先在pubspec.yaml中找到'dependencies:‘，然后在'dependencies:’下键入http:+%5E0.12.0%2B2，然后按ctrl+%2Bs运行get+packages。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4108874|示例：|4108875|dependencies:
++http:+%5E0.12.0%2B2
++flutter:
++++sdk:+flutter

++#+The+following+adds+the+Cupertino+Icons+font+to+your+application.
++#+Use+with+the+CupertinoIcons+class+for+iOS+style+icons.
++cupertino_icons:+%5E0.1.2|code-block|syntax|javascript|4108876|entityMap^0|3|C|1J|F|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

You first find 'dependencies:' in <code>pubspec.yaml</code>
then under 'dependencies:' type <code>http: ^0.12.0+2</code> and then press ctrl + s to run get packages.

sample:

<pre><code>dependencies:
 http: ^0.12.0+2
 flutter:
 sdk: flutter

 # The following adds the Cupertino Icons font to your application.
 # Use with the CupertinoIcons class for iOS style icons.
 cupertino_icons: ^0.1.2
</code></pre>

blocks|key|1619436|text|cupertino_icons：%5E0.1.2|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1619437|http:+any|1619438|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

cupertino_icons: ^0.1.2
http: any

blocks|key|4108790|text|http:必须与其他依赖项对齐。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4108791|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

http: 
have to be align with the other dependencies.

blocks|key|4108813|text|虽然我在Pubspec.yaml文件中有最新的http包，但我也有同样的问题。这个错误仍然存在，我做了这两个步骤，错误被解决了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4108814|4108815|删除导入‘dart：_+'dart:convert';|ordered-list-item|4108816|’；如果存在，请添加导入dart|4108817|unordered-list-item|4108818|4108819|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|P|8|@]|9|@]|A|$]]|$1|H|3|-4|5|I|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

I had the same issue although I had the latest http package in Pubspec.yaml file. This error was still in there I did these 2 steps and error was resolved.

<ol>
<li>Remove import 'dart:_http'; if it is there</li>
<li>Add import 'dart:convert';</li>
</ol>

I am very new to <code>Flutter</code>, and stuck at the following error:

<pre class="lang-none prettyprint-override"><code>package:http/http.dart That library is in a package that is not known.
</code></pre>

Maybe you forgot to mention it in your <code>pubspec.yaml</code> file?

Please help in resolving this error.

Flutter: How to resolve Error importing package:http/http.dart

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我对Flutter非常陌生，并且一直纠结于以下错误：package:http/http.dart That library is in a package that is not known.也许你忘了在你的pubspec.yaml文件中提到它？请帮助解决此错误。

问Flutter:如何解决导入包时出现的错误:http/http.dart
EN

回答 16

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问Flutter:如何解决导入包时出现的错误:http/http.dartEN

回答 16

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问Flutter:如何解决导入包时出现的错误:http/http.dart
EN