blocks|key|260714|text|对我来说，这不是我的互联网连接速度的问题，而是IPv6解决"repo.packagist.org“的问题。通过将IPv4地址添加到我的主机文件中，我解决了这个问题。这是一次黑客攻击，但很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|260715|#+dig+%2Bshort+repo.packagist.org
142.44.164.255
#+echo+"142.44.164.255+repo.packagist.org"+>>+/etc/hosts|code-block|syntax|javascript|260716|这里有更多细节！|offset|length|260717|entityMap|0|LINK|mutability|MUTABLE|url|https://wiki.garrettmills.dev/s/bsvdk0ml9dtuqoaj356g/development/d/bsvdk6el9dtuqoaj357g/php-composer^0|0|0|0|8|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

For me, this wasn't an issue with my internet connection speed, but it was a issue with IPv6 resolution of &quot;repo.packagist.org&quot;. I got around this issue by adding the IPv4 address to my hosts file. It's a hack, but it works.
<pre><code># dig +short repo.packagist.org
142.44.164.255
# echo &quot;142.44.164.255 repo.packagist.org&quot; &gt;&gt; /etc/hosts
</code></pre>
<a href="https://wiki.garrettmills.dev/s/bsvdk0ml9dtuqoaj356g/development/d/bsvdk6el9dtuqoaj357g/php-composer" rel="nofollow noreferrer">More details here!</a>

blocks|key|1738774|text|试试看这个解决方案对我有效！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738775|"repositories":+[
++++{
+++++++++"type":+"composer",+
+++++++++"url":+"https://packagist.org"
++++},
++++{+"packagist":+false+}
]|code-block|syntax|javascript|1738776|并再次运行composer:update。如果没有，那么run+composer+self-update|offset|length|style|CODE|1738777|我得到了答案，这里，它就像伏都教.|1738778|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/48264591/installing-laravel-suddenly-some-json-file-cannot-be-downloaded#48264700^0|0|0|5|F|S|O|0|7|2|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]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$I|14|J|15|1|16]]|A|$]]|$1|O|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

try this solution worked for me!

<pre><code>"repositories": [
 {
 "type": "composer", 
 "url": "https://packagist.org"
 },
 { "packagist": false }
]
</code></pre>

and run <code>composer:update</code> once again. If not then <code>run composer self-update</code>

I got the answer <a href="https://stackoverflow.com/questions/48264591/installing-laravel-suddenly-some-json-file-cannot-be-downloaded#48264700">here</a> and it works like voodoo...

blocks|key|1738933|text|对我来说，是ipv6，我使用：networksetup+-setv6off+Wi-Fi+on+macOS禁用了它。很有魅力。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1738934|在这里找到的解决方案：https://getcomposer.org/doc/articles/troubleshooting.md#operation-timed-out-ipv6-issues-|1738935|entityMap|0|LINK|mutability|MUTABLE|url|https://getcomposer.org/doc/articles/troubleshooting.md#operation-timed-out-ipv6-issues-^0|F|S|0|B|2G|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

For me it was ipv6, I disabled it using: <code>networksetup -setv6off Wi-Fi</code> on macOS. Worked like a charm.

Solution found here: <a href="https://getcomposer.org/doc/articles/troubleshooting.md#operation-timed-out-ipv6-issues-" rel="noreferrer">https://getcomposer.org/doc/articles/troubleshooting.md#operation-timed-out-ipv6-issues-</a>

blocks|key|1738650|text|这个问题很可能与你的互联网连接有关。只要尝试另一个(或更可靠的)互联网来源。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738651|如果问题仍然存在，并且您确信您的互联网连接，那么结帐建议这里。|offset|length|1738652|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/31636294/https-packagist-org-packages-json-file-could-not-be-downloaded^0|0|S|2|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

The problem is most likely with your internet connect. Just try with another (or a more reliable) source of internet.

If problem persists, and you are sure of your internet connection, then checkout suggestions <a href="https://stackoverflow.com/questions/31636294/https-packagist-org-packages-json-file-could-not-be-downloaded">here</a>.

blocks|key|893306|text|我听说如果您居住在政府防火墙后面的某个区域，可能会发生这个问题，您可能想要测试它在VPN后面是否有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|893307|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Great_Firewall^0|9|5|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I have heard this problem can occur if you live in an area behind <a href="https://en.wikipedia.org/wiki/Great_Firewall" rel="nofollow noreferrer">a government firewall</a>, you might want to test if it works when behind a VPN.

blocks|key|1738966|text|这个问题类似于这个问题：安装laravel突然无法下载一些json文件|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1738967|这是对我有用的答案：|1738968|这在Linux上有效。它将ipv4优先于ipv6|1738969|sudo+sh+-c+"echo+'precedence+::ffff:0:0/96+100'+>>+/etc/gai.conf"|code-block|syntax|javascript|1738970|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/48264591/installing-laravel-suddenly-some-json-file-cannot-be-downloaded/64176681#64176681^0|C|N|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|C|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

This question is similar to this: <a href="https://stackoverflow.com/questions/48264591/installing-laravel-suddenly-some-json-file-cannot-be-downloaded/64176681#64176681">Installing laravel suddenly some json file cannot be downloaded</a>
This is the answer that worked for me:
This worked on Linux. It prioritizes ipv4 over ipv6
<pre><code>sudo sh -c &quot;echo 'precedence ::ffff:0:0/96 100' &gt;&gt; /etc/gai.conf&quot;
</code></pre>

blocks|key|259598|text|这个问题发生在你的低速或坏连接。它无法访问互联网和下载存储库。检查您的internet连接，然后再尝试将您的控制台连接到internet。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|259599|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|$]]

This problem occurs for your low speed or bad connection. It failed to access internet and download repository.
Check your internet connection and try again to connect your console to the internet.

blocks|key|893326|text|大多数情况下，当您没有从服务器获得响应时就会发生这种情况。1.检查互联网连接。2.检查来自服务器的代理阻止您的响应。3.如果阻止代理。在安装composer时，您可以在安装过程中设置适当的代理配置。4.您应该检查您的管理用户特权。5.如有客人或有限帐户。您不能从外部服务器下载任何文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|893327|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|$]]

Mostly it happens when you did not get the response from the server. 
1. check internet connection.
2. check any proxy block your response from the server.
3. if block proxy. When installing the composer that time you set proper proxy configuration on your installation process.
4. You should check your admin user privilege.
5. If you guest or limited account. You can not download any file from the outside server.

blocks|key|1738753|text|这个问题是由于互联网连接缓慢或没有互联网造成的。如果没有互联网，那么软件包将无法从服务器下载。这就是为什么它给了我这个错误，我面对了很多次。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738754|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|$]]

The problem is due to slow internet connection or no internet. If there is no internet then The packages are unable to download from the server. that's why it gives this error i had face many time.

blocks|key|1738850|text|根据您的位置切换到镜像：https://packagist.org/mirrors|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1738851|尤其是当你在中国的时候。|1738852|entityMap|0|LINK|mutability|MUTABLE|url|https://packagist.org/mirrors^0|C|T|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Switch to a mirror according to your location :
<a href="https://packagist.org/mirrors" rel="nofollow noreferrer">https://packagist.org/mirrors</a>

Especially if you're in China.

blocks|key|1738898|text|在linux上，运行此命令似乎有助于使ipv4流量具有比ipv6更高的prio，这比完全禁用ipv6更好的选择：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738899|解决方法:+Linux：|1738900|sudo+sh+-c+"echo‘优先级::ffff:0:0/96+100’>>+/etc/gai.conf"在这里输入图像描述|offset|length|1738901|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/uH1ud.png^0|0|0|1J|9|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

On linux, it seems that running this command helps to make ipv4 traffic have a higher prio than ipv6, which is a better alternative than disabling ipv6 entirely:

Workaround Linux:

sudo sh -c "echo 'precedence ::ffff:0:0/96 100' >> /etc/gai.conf"<a href="https://i.stack.imgur.com/uH1ud.png" rel="nofollow noreferrer">enter image description here</a>

blocks|key|893485|text|export+no_proxy=.github.com,.getcomposer.org|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|893486|您只需在composer目录中添加此代码并按enter即可。然后再试一次。在进行Magento+2示例数据部署时，我也遇到了同样的错误。这段代码确实帮助我继续这个过程。|unstyled|893487|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>export no_proxy=.github.com,.getcomposer.org
</code></pre>

You can just add this code in your composer directory and hit enter. Then try again. While I was working on Magento 2 sample data deployment, I got the same error. This code did help me to continue the process.

blocks|key|1738995|text|强制使用https和composer解决了这个问题。对于任何其他看到这一点的人，请运行下面的命令，强制composer使用https。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738996|composer+config+-g+repo.packagist+composer+https://packagist.org|code-block|syntax|javascript|1738997|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|$]]

Forcing the use of https with composer fix this. For anyone else who sees this, run the following to force composer to use https.
<pre><code>composer config -g repo.packagist composer https://packagist.org
</code></pre>

blocks|key|893424|text|清除DNS缓存为我修复了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|893425|在终端执行：|893426|dscacheutil+-flushcache

sudo+killall+-HUP+mDNSResponder|code-block|syntax|javascript|893427|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Clearing the DNS cache fixed this for me.

In the terminal execute:

<pre><code>dscacheutil -flushcache

sudo killall -HUP mDNSResponder
</code></pre>

This morning, I ran this command 

<pre><code>composer create-project laravel/laravel laravel-4.2 4.2 --prefer-dist
</code></pre>

I kept getting 

<a href="https://i.stack.imgur.com/yMs00.png" rel="noreferrer"><img src="https://i.stack.imgur.com/yMs00.png" alt="enter image description here"></a>

<blockquote>
 The "<a href="https://packagist.org/packages.json" rel="noreferrer">https://packagist.org/packages.json</a>" file could not be downloaded: failed to open stream: Operation timed out 
 Retrying with degraded mode, check <a href="https://getcomposer.org/doc/articles/troubleshooting.md#degraded-mode" rel="noreferrer">https://getcomposer.org/doc/articles/troubleshooting.md#degraded-mode</a> for more info
</blockquote>

Anyone know how to avoid this ?

"https://packagist.org/packages.json" file could not be downloaded: failed to open stream: Operation timed out

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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今天早上，我运行了这个命令composer create-project laravel/laravel laravel-4.2 4.2 --prefer-dist我一直在​​无法下载"“文件:打开流失败:操作超时使用降级模式重试，请查看获得更多信息。有人知道怎么避免吗？

问“无法下载https://packagist.org/packages.json”文件:打开流失败:操作超时
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