【发布时间】：2019-05-01 11:38:49
【问题描述】：
我在 Windows 机器上本地运行两个网站时遇到问题（a.ryan 和 b.ryan）。我遇到的问题不会发生在实时环境中（运行 CentOS7）。 b.ryan 中的脚本向 a.ryan 发出 CURL 请求：
* Rebuilt URL to: http://a.ryan/
* Hostname a.ryan was found in DNS cache
* Trying 192.168.0.64...
* TCP_NODELAY set
* Connected to a.ryan (192.168.0.64) port 80 (#0)
> GET / HTTP/1.1
Host: a.ryan
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)
Accept: */*
* Operation timed out after 10000 milliseconds with 0 bytes received
* Curl_http_done: called premature == 1
* Closing connection 0
如您所见 - 连接超时。我在这里尝试过更长的持续时间（结果相同），尽管实际上它应该几乎是即时的。
我目前正在使用以下功能：
function getHTML($url) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSLVERSION, 3);
curl_setopt($ch, CURLOPT_PROXY, '');
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, false);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)');
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_STDERR, fopen('curl.txt', 'w+'));
$tmp = curl_exec($ch);
curl_close($ch);
if ($tmp != false) {
return $tmp;
}
}
诚然，这里有很多选项可能不需要存在 - 但这是尝试在线找到的多种解决方案的结果。澄清一下，当我使用时，我得到的回复与上面发布的完全相同：
function getHTML($url) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_STDERR, fopen('curl.txt', 'w+'));
$tmp = curl_exec($ch);
curl_close($ch);
if ($tmp != false) {
return $tmp;
}
}
希望这能让我了解我尝试使用 PHP Curl 方法解决此问题的设置。
当我在命令行上运行 Curl 时，它工作正常：
* Rebuilt URL to: a.ryan/
* Trying 192.168.0.64...
* TCP_NODELAY set
* Connected to a.ryan (192.168.0.64) port 80 (#0)
> GET / HTTP/1.1
> Host: a.ryan
> User-Agent: curl/7.55.1
> Accept: */*
>
< HTTP/1.1 302 Moved Temporarily
< Server: nginx/1.12.0
< Date: Wed, 01 May 2019 11:34:12 GMT
< Content-Type: text/html; charset=UTF-8
< Transfer-Encoding: chunked
< Connection: keep-alive
< X-Powered-By: PHP/5.6.30
< Set-Cookie: PHPSESSID=9898j4cia9s888jn24gr4be8m5; path=/
< Expires: Thu, 19 Nov 1981 08:52:00 GMT
< Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
< Pragma: no-cache
< location: /home
<
* Connection #0 to host a.ryan left intact
我还禁用了这台机器上我的网络接口上的所有 IPv6 配置，因为我最初的印象是这个问题是由 IPv6 分辨率而不是 IPv4 引起的，但它没有任何区别。
如果有帮助，这是我的 hosts 文件的副本。
# Copyright (c) 1993-2009 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
#102.54.94.97 rhino.acme.com # source server
#38.25.63.10 x.acme.com # x client host
# localhost name resolution is handled within DNS itself.
#127.0.0.1 localhost
#::1 localhost
127.0.0.1 localhost.localdomain localhost MyPCName
127.0.0.1 a.ryan
127.0.0.1 b.ryan
编辑
忘了提 - 如果我在 CLI 中运行脚本，它也可以正常运行。所以它实际上特定于通过浏览器运行脚本。 （使用 Winginx 服务网站）
【问题讨论】：
-
看起来像服务器配置问题。您是否能够连接到 localhost 以外的主机，如果不能，防火墙可能会阻止对您的开发堆栈的所有请求，包括 dns 查询。在浏览器中打开 b.ryan 时，您是否可以在 CLI 中运行脚本并检查它是立即返回响应还是在网页完成加载后等待 10 秒？如果它在 10 秒后加载，则表示服务器是单线程的，无法处理 2 个请求同时